CN110441683A

CN110441683A - Energy storage inverter and its controller

Info

Publication number: CN110441683A
Application number: CN201910875707.XA
Authority: CN
Inventors: 金灵辉
Original assignee: Sungrow Shanghai Co Ltd
Current assignee: Sungrow Shanghai Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2019-11-12

Abstract

The present invention provides a kind of energy storage inverter and its controller, and the processor of the controller of the energy storage inverter realizes the control for exchanging relay on each cable of the relay unit of side three by M I/O port respectively；And the voltage of three relay units between any two is received by N/2 voltage sampling port respectively, and in addition N/2 voltage sampling port receives the midpoint sample voltage of three relay units, and then realize that the failure of removal for the relay in grid-connected relay unit, bypass relay unit and off-network relay unit detects, reduce the resource occupation for controller I/O port and voltage sampling port compared with prior art, and then improves the cost performance of energy storage inverter.

Description

Energy storage inverter and its controller

Technical field

The invention belongs to relay fault detection technique fields, more specifically, more particularly to a kind of energy storage inverter and Its controller.

Background technique

Energy storage inverter has grid-connected, off-network and bypass multiple-working mode.Due to safety requirement, energy storage inverter exchange Relay quantity needed for side is more, referring to Fig. 1, including and network relay 1., off-network relay 3. with bypass relay 2., three Kind relay is all made of the design of relay Redundant Control, wherein Grid is and network interface, Load are off-network load port, and L is firewire, N For zero curve.The failure of removal of relay include glue dead failure and be not closed failure, if relay generation failure of removal and fail and When detected, then may result in energy storage inverter damage, and the relay quantity of energy storage inverter is more, relay failure Risk is also larger, therefore, it is necessary to carry out relay failure fault detection before energy storage inverter works normally.

According to the relay test method of traditional gird-connected inverter, then need to occupy its controller 12 I/O ports and Multiple voltage sampling ports；And it is different from traditional gird-connected inverter, energy storage inverter also needs to be equipped with battery charging and discharging control function With off-network control function, therefore, the controller I/O port of energy storage inverter and the resource requirement of voltage sampling port are larger, it will cause The sexual valence of energy storage inverter is relatively low.

Summary of the invention

In view of this, the purpose of the present invention is to provide a kind of energy storage inverter and its controller, to solve the prior art Middle relay failure of removal detection occupancy controller resource is more, the problem for causing the cost performance of energy storage inverter lower.

First aspect present invention discloses a kind of controller of energy storage inverter, exchanged with energy storage inverter side it is grid-connected after Electric appliance unit, bypass relay unit and off-network relay unit are connected；The controller of the energy storage inverter includes: processing Device, N number of voltage sampling port and M I/O port；N=6 and M=6, alternatively, N=12 and M=9；Wherein:

Each I/O port is connected with the control terminal for corresponding to two relays on cable in corresponding relay unit respectively；

Wherein N/2 voltage sampling port receives the sampled voltage of three relay units between any two；

In addition N/2 voltage sampling port receives the midpoint sample voltage of three relay units；

The processor is used to control the output signal variation of each I/O port, and received according to each voltage sampling port Sampled voltage judges that the relay in grid-connected relay unit, bypass relay unit and off-network relay unit whether there is Failure.

Optionally, N=6 and M=6, N number of voltage sampling port are respectively the first to the 6th voltage sampling port, M I/O port difference For the first to the 6th I/O port；Wherein:

First I/O port is connected with the control terminal of two relays on the grid-connected relay unit fire wire cable respectively；Second I/O port is connected with the control terminal of two relays on the grid-connected relay unit zero curve cable respectively；Third I/O port respectively with institute The control terminal for stating two relays on off-network relay unit fire wire cable is connected；4th I/O port respectively with the off-network relay The control terminal of two relays is connected on unit zero curve cable；5th I/O port respectively with the bypass relay unit fire wire cable The control terminal of upper two relays is connected；6th I/O port respectively with two relays on the bypass relay unit zero curve cable Control terminal be connected；

First voltage thief hatch receives the energy storage inverter and network interface sampled voltage；Second voltage thief hatch receives institute State the midpoint sample voltage of grid-connected relay unit；Tertiary voltage thief hatch receives the midpoint sample of the off-network relay unit Voltage；4th voltage sampling port receives the off-network mouth sampled voltage of the energy storage inverter；Described in 5th voltage sampling port receives Bypass the midpoint sample voltage of relay unit；6th voltage sampling port receives the exchange side sampling electricity of the energy storage inverter Pressure；

The processor is used to control the output signal variation of the described first to the 6th I/O port, and according to described first to the The sampled voltage that six voltage sampling ports receive judges the grid-connected relay unit, the bypass relay unit and described Relay in off-network relay unit whether there is failure.

Optionally, the processor is used to control the output signal variation of each I/O port, and according to each voltage sampling port The sampled voltage received judges the relay in grid-connected relay unit, bypass relay unit and off-network relay unit When with the presence or absence of failure, it is specifically used for:

First I/O port and second I/O port output closure control signal are controlled, and in the first voltage thief hatch In the case where having the excitation of the 6th voltage sampling port no-voltage described in voltage drive, according to the first voltage thief hatch and described the The sampled voltage that six voltage sampling ports receive judges that the relay in the grid-connected relay unit whether there is and is not closed event Barrier；

Control first I/O port and second I/O port export different control signals, and in first voltage thief hatch and In the case that 6th voltage sampling port has voltage drive, adopted according to the first voltage thief hatch and the 6th voltage The sampled voltage that at least one in sample mouth is received with the second voltage thief hatch judges in the grid-connected relay unit Relay, which whether there is, glues dead failure；

The third I/O port and the 4th I/O port output closure control signal are controlled, and in the 6th voltage sampling port In the case that only one has voltage drive in the 4th voltage sampling port, according to the 6th voltage sampling port and described the The sampled voltage that four voltage sampling ports receive judges that the relay in the off-network relay unit whether there is and is not closed event Barrier；

It controls the third I/O port and the 4th I/O port exports different control signals, and in the 6th voltage sample In the case that mouth and the 4th voltage sampling port have voltage drive, according to the 4th voltage sampling port and the 6th electricity The sampled voltage that any one in pressure thief hatch is received with the tertiary voltage thief hatch, judges the off-network relay unit In relay with the presence or absence of gluing dead failure；

The 5th I/O port and the 6th I/O port output closure control signal are controlled, and in the first voltage thief hatch In the case where thering is voltage drive and the 4th voltage sampling port no-voltage to motivate, according to the first voltage thief hatch with it is described The sampled voltage that 4th voltage sampling port receives judges that the relay in the bypass relay unit whether there is and is not closed Failure；

And

It controls the 5th I/O port and the 6th I/O port exports different control signals, and sampled in the first voltage In the case that mouth the 4th voltage sampling port has voltage drive, according to the first voltage thief hatch and the 4th voltage The sampled voltage that any one in thief hatch is received with the 5th voltage sampling port judges in the bypass relay unit Relay with the presence or absence of gluing dead failure.

Optionally, the processor judges the grid-connected relay unit, the bypass relay unit and the off-network Relay in relay unit whether there is the sequence of failure are as follows:

Judge that the relay in the bypass relay unit whether there is and is not closed failure；

If there is no be not closed failure, the judgement simultaneously network relay list for the relay in the bypass relay unit Relay in member, which whether there is, is not closed failure；

If there is no be not closed failure, the judgement simultaneously network relay list for the relay in the grid-connected relay unit Relay in member, which whether there is, glues dead failure；

If the relay in the grid-connected relay unit judges the bypass relay unit there is no dead failure is glued In relay with the presence or absence of gluing dead failure；

If the relay in the bypass relay unit judges the off-network relay unit there is no dead failure is glued In relay with the presence or absence of not being closed failure；

If the relay in the off-network relay unit judges the off-network relay list there is no failure is not closed Relay in member, which whether there is, glues dead failure；

If the relay in the off-network relay unit determines described and network relay list there is no dead failure is glued Failure is not present in first, the described off-network relay unit and the bypass relay unit.

Optionally, the 5th I/O port and the 6th I/O port output closure control signal are controlled, and in first electricity In the case that pressure thief hatch has voltage drive and the 4th voltage sampling port no-voltage to motivate, sampled according to the first voltage The sampled voltage that mouth is received with the 4th voltage sampling port, judges whether the relay in the bypass relay unit is deposited It is not closed failure, comprising:

In the case where the first voltage thief hatch has voltage drive and the 4th voltage sampling port no-voltage motivates, It controls the 5th I/O port and the 6th I/O port exports closure control signal；

Judge whether the sampled voltage that the 4th voltage sampling port receives is equal to the first voltage thief hatch reception The sampled voltage arrived；

Wherein, it is received if the sampled voltage that the 4th voltage sampling port receives is equal to the first voltage thief hatch Sampled voltage, then determine the relay in the bypass relay unit there is no not being closed failure；If the 4th voltage The sampled voltage that thief hatch receives is not equal to the sampled voltage that the first voltage thief hatch receives, then determines the bypass Relay in relay unit, which exists, is not closed failure.

Optionally, first I/O port and second I/O port output closure control signal are controlled, and in first electricity In the case that pressure thief hatch has voltage drive and the 6th voltage sampling port no-voltage to motivate, sampled according to the first voltage The sampled voltage that mouth and the 6th voltage sampling port receive, judges whether the relay in the grid-connected relay unit is deposited It is not closed failure, comprising:

It controls the energy storage inverter to run with voltage source mode, the sampling electricity for receiving the 6th voltage sampling port Pressure is equal to the sampled voltage that the first voltage thief hatch receives；

It controls first I/O port and second I/O port exports closure control signal；

It is out of service to control the energy storage inverter, motivates the 6th voltage sampling port no-voltage；

Judge whether the sampled voltage that the 6th voltage sampling port receives is equal to the first voltage thief hatch reception The sampled voltage arrived；

Wherein, it is received if the sampled voltage that the 6th voltage sampling port receives is equal to the first voltage thief hatch Sampled voltage, then determine that there is no be not closed failure for relay in the grid-connected relay unit；If the 6th voltage The sampled voltage that thief hatch receives is not equal to the sampled voltage that the first voltage thief hatch receives, then determines described grid-connected Relay in relay unit, which exists, is not closed failure.

Optionally, it controls first I/O port and second I/O port exports different control signals, and described first In the case that voltage sampling port and the 6th voltage sampling port have voltage drive, according to the first voltage thief hatch and institute State the sampled voltage that at least one in the 6th voltage sampling port is received with the second voltage thief hatch, judge it is described it is grid-connected after Relay in electric appliance unit, which whether there is, glues dead failure, comprising:

The third I/O port and the 4th I/O port output closure control signal are controlled, keeps the 6th voltage sampling port logical It crosses the off-network relay unit and the bypass relay unit receives the voltage drive of power grid output；

It controls the first I/O port output and disconnects control signal, and control the second I/O port output closure control signal, Judge whether the sampled voltage that the second voltage thief hatch receives is equal to the first voltage thief hatch and the 6th electricity The sampled voltage that any one in pressure thief hatch receives；If so, determining two on the grid-connected relay unit fire wire cable At least one of a relay, which exists, glues dead failure；Otherwise, it is determined that on the grid-connected relay unit fire wire cable two after Electric appliance, which is not present, glues dead failure；

The first I/O port output closure control signal is controlled, and controls the second I/O port output and disconnects control signal, Judge whether the sampled voltage that the second voltage thief hatch receives is equal to the first voltage thief hatch and the 6th electricity The sampled voltage that any one in pressure thief hatch receives；If so, determining two on the grid-connected relay unit zero curve cable At least one of a relay, which exists, glues dead failure；Otherwise, it is determined that on the grid-connected relay unit zero curve cable two after Electric appliance, which is not present, glues dead failure.

Optionally, it controls the 5th I/O port and the 6th I/O port exports different control signals, and described first In the case that voltage sampling port and the 4th voltage sampling port have voltage drive, according to the first voltage thief hatch and institute State the sampled voltage that any one in the 4th voltage sampling port is received with the 5th voltage sampling port, judge it is described bypass after Relay in electric appliance unit, which whether there is, glues dead failure, comprising:

It controls first I/O port and second I/O port exports closure control signal, make the 4th voltage sampling port The voltage drive of power grid output is received by described and network relay and the off-network relay；

It controls the energy storage inverter to run with current source mode, the energy storage inverter is made normally to generate electricity by way of merging two or more grid systems；

It controls the 5th I/O port output and disconnects control signal, and control the 6th I/O port output closure control signal, Judge whether the sampled voltage that the 5th voltage sampling port receives is equal to the first voltage thief hatch and the 4th electricity The sampled voltage that any one in pressure thief hatch receives；If so, determining two on the bypass relay unit fire wire cable At least one of a relay, which exists, glues dead failure；Otherwise, it is determined that on the bypass relay unit fire wire cable two after Electric appliance, which is not present, glues dead failure；

The 5th I/O port output closure control signal is controlled, and controls the 6th I/O port output and disconnects control signal, Judge whether the sampled voltage that the 5th voltage sampling port receives is equal to the first voltage thief hatch and the 4th electricity The sampled voltage that any one in pressure thief hatch receives；If so, determining two on the bypass relay unit zero curve cable At least one of a relay, which exists, glues dead failure；Otherwise, it is determined that on the bypass relay unit zero curve cable two after Electric appliance, which is not present, glues dead failure.

Optionally, the third I/O port and the 4th I/O port output closure control signal are controlled, and in the 6th electricity In the case that only one has voltage drive in pressure thief hatch and the 4th voltage sampling port, according to the 6th voltage sampling port The sampled voltage received with the 4th voltage sampling port judges that the relay in the off-network relay unit whether there is It is not closed failure, comprising:

Judge whether the sampled voltage that the 4th voltage sampling port receives is equal to the 6th voltage sampling port reception The sampled voltage arrived；

If so, determining that there is no be not closed failure for relay in the off-network relay unit；Otherwise described in determining Relay in off-network relay unit, which exists, is not closed failure.

Optionally, it controls the third I/O port and the 4th I/O port exports different control signals, and the described 6th In the case that voltage sampling port and the 4th voltage sampling port have voltage drive, according to the 4th voltage sampling port and institute State the sampled voltage that any one in the 6th voltage sampling port is received with the tertiary voltage thief hatch, judge the off-network after Relay in electric appliance unit, which whether there is, glues dead failure, comprising:

It controls the 5th I/O port and the 6th IO exports closure control signal, keep the 4th voltage sampling port logical Cross the voltage drive that the bypass relay unit receives power grid output；

It controls the third I/O port output and disconnects control signal, and control the 4th I/O port output closure control signal, Judge whether the sampled voltage that the tertiary voltage thief hatch receives is equal to the sampling that the first voltage thief hatch receives Voltage；If so, determining that at least one of two relays have viscous dead event on the off-network relay unit fire wire cable Barrier；Otherwise, it is determined that two relays are not present and glue dead failure on the off-network relay unit fire wire cable；

The third I/O port output closure control signal is controlled, and controls the 4th I/O port output and disconnects control signal, Judge whether the sampled voltage that the tertiary voltage thief hatch receives is equal to the sampling that the first voltage thief hatch receives Voltage；If so, determining that at least one of two relays have viscous dead event on the off-network relay unit zero curve cable Barrier；Otherwise, it is determined that two relays are not present and glue dead failure on the off-network relay unit zero curve cable.

Optionally, the processor is also used to:

The relay in any one relay unit is being judged there are when failure, and the alarm of Xiang Suoshu energy storage inverter is set Preparation send preset alarm signal, so that user learns that relay failure failure occurs in the energy storage inverter.

Second aspect of the present invention discloses a kind of energy storage inverter, comprising:

Inverter circuit；

It is set to the grid-connected relay unit, off-network relay unit and bypass relay list of inverter circuit exchange side Member；And

The controller of energy storage inverter disclosed in first aspect any one；

The grid-connected relay unit is set to inverter circuit exchange side and the energy storage inverter and network interface it Between, the off-network relay unit is set between the inverter circuit exchange side and the off-network mouth of the energy storage inverter, institute State bypass relay unit be set to it is described and between network interface and the off-network mouth.

From above-mentioned technical proposal it is found that a kind of controller of energy storage inverter provided by the invention, processor pass through M I/O port realizes the control for relay on exchange each cable of the relay unit of side three respectively；And it is adopted by N/2 voltage Sample mouth receives the voltage of three relay units between any two respectively, and in addition N/2 voltage sampling port receives three relays The midpoint sample voltage of unit；In N=6 and M=6, i.e., in the case where energy storage inverter is single-phase, which only needs 6 I/O ports and 6 voltage sampling ports are set, can be realized for grid-connected relay unit, bypass relay unit and off-network after The failure of removal detection of relay in electric appliance unit, reduce compared to the prior art in same situation for controller I/O port and The resource occupation of voltage sampling port, and then improve the cost performance of energy storage inverter.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention Some embodiments for those of ordinary skill in the art without creative efforts, can also basis These attached drawings obtain other attached drawings.

Fig. 1 is the schematic diagram for the energy storage inverter that the prior art provides；

Fig. 2 is the schematic diagram of all parts in energy storage inverter provided in an embodiment of the present invention；

Fig. 3 be energy storage inverter provided in an embodiment of the present invention controller in judge whether there is failure method stream Cheng Tu；

Fig. 4 is a kind of schematic diagram of energy storage inverter provided in an embodiment of the present invention；

Fig. 5 is a kind of schematic diagram of the controller of energy storage inverter provided in an embodiment of the present invention；

Fig. 6 is the schematic diagram of the controller of another energy storage inverter provided in an embodiment of the present invention；

Fig. 7 is the schematic diagram of the controller of another energy storage inverter provided in an embodiment of the present invention；

Fig. 8 is the schematic diagram of another energy storage inverter provided in an embodiment of the present invention.

Specific embodiment

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.

In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that including process, the side of element There is also other identical elements in method, article or equipment.

The embodiment of the invention discloses a kind of controllers of energy storage inverter, and the grid-connected relay of side is exchanged with energy storage inverter Device unit, bypass relay unit and off-network relay unit are connected；To solve relay failure fault detection in the prior art It is more to occupy controller resource, the problem for causing the cost performance of energy storage inverter lower.

The controller of the energy storage inverter, referring to Fig. 6, comprising: processor 610, N number of voltage sampling port 10 and M IO Mouth 20.

Each I/O port 20 is connected with the control terminal for corresponding to two relays on cable in corresponding relay unit respectively.

N/2 voltage sampling port 10 receives the sampled voltage between adjacent relay unit, in addition N/2 voltage sampling port 10 receive the midpoint sample voltage of each relay unit.Such as when N=6,3 voltage sampling ports 10 receive three relay lists The sampled voltage of member between any two, in addition 3 voltage sampling ports 10 receive the midpoint sample voltage of three relay units.

Processor 610, the output signal for controlling each I/O port 20 changes, and is received according to each voltage sampling port 10 The sampled voltage arrived, judge grid-connected relay unit, bypass relay unit and off-network relay unit in relay whether There are failures.

In N=6 and M=6, energy storage inverter is direct current-Single-phase Converter, and power grid is single phase ac power grid, is born Carry is that single phase ac loads；The exchange side of energy storage inverter is respectively arranged with fire wire cable and zero curve cable, corresponding relay list Member is respectively provided with the relay of two series connections on fire wire cable and zero curve cable.

In this case, 3 voltage sampling ports 10 receive the sampled voltage of three relay units between any two, and in addition 3 A voltage sampling port 10 receives the midpoint sample voltage of three relay units, and 2 I/O ports are respectively and in grid-connected relay unit The control terminal of relay on corresponding cable is connected, and 2 I/O ports are respectively and on corresponding cable in off-network relay unit The control terminal of relay is connected, 2 I/O ports respectively with the control terminal of the relay on corresponding cable in bypass relay unit It is connected.

In N=12 and M=9, energy storage inverter is direct current-three-phase alternating current inverter, and power grid is three-phase AC grid, is born Carry is that three-phase alternating current loads；The exchange side of energy storage inverter is provided with A phase cable, B phase cable and C phase cable, corresponding relay Unit is respectively provided with the relay of two series connections on three-phase cable.

In this case, 6 voltage sampling ports 10 receive the sampled voltage of three relay units between any two, and in addition 6 A voltage sampling port 10 receives the midpoint sample voltage of three relay units, and 3 I/O ports are respectively and in grid-connected relay unit The control terminal of relay on corresponding cable is connected, and 3 I/O ports are respectively and on corresponding cable in off-network relay unit The control terminal of relay is connected, 3 I/O ports respectively with the control terminal of the relay on corresponding cable in bypass relay unit It is connected.

Certainly, energy storage inverter may be three-phase four-wire system, within the scope of protection of this application.Each relay list Depending on the case where setting of relay in member, the energy storage inverter that foundation is actually selected, in the protection model of the application In enclosing.

It should be noted that voltage sampling port 10 and the number of I/O port 20 are related to the number of phases of energy storage inverter, Ge Geji The control terminal that the relay on same phase cable is arranged in electric appliance unit connects the same I/O port, to be controlled by the I/O port The open and close of relay on the phase cable.Voltage sampling port 10 receives the relay same position on corresponding two-phase cable Between voltage, if the relay on two-phase cable the same side connect a voltage sampling port 10, the other side connects another Voltage sampling port 10, so that processor can receive the sampled voltage between any two-phase relay same position.

In the present embodiment, the processor 610 of the controller of energy storage inverter is realized respectively by M I/O port for exchange The control of relay on each cable of relay unit of side three；And three relays are received by N/2 voltage sampling port respectively The voltage of device unit between any two, and in addition N/2 voltage sampling port receives the midpoint sample voltage of three relay units；In When N=6 and M=6, i.e., in the case where energy storage inverter is single-phase, which only needs to be arranged 6 I/O ports and 6 voltages The mistake for relay in grid-connected relay unit, bypass relay unit and off-network relay unit can be realized in thief hatch Fault detection is imitated, reduces compared to the prior art in same situation and the resource of controller I/O port and voltage sampling port is accounted for With, and then improve the cost performance of energy storage inverter.

When energy storage inverter is single-phase, referring to fig. 2, energy storage inverter exchanges the specific structure of each relay unit in side And connection relationship are as follows:

Grid-connected relay unit 11 includes: the first relay K1, the second relay K2, third relay K3 and the 4th relay Device K4.

Wherein, the first relay K1 and third relay K3 is connected in series, and is all set in inverter circuit INV and simultaneously network interface On the fire wire cable L of Grid, the first relay K1 is set to inverter circuit INV exchange side, and third relay K3 is set to grid-connected The side mouth Grid；Second relay K2 and the 4th relay K4 series connection, and it is all set in the zero of inverter circuit INV and simultaneously network interface Grid On line cable N, the second relay K2 is set to inverter circuit INV exchange side, and the 4th relay K4 is set to and the side network interface Grid.

Off-network relay unit 13 includes: the 5th relay K5, the 6th relay K6, the 7th relay K7 and the 8th relay Device K8.

Wherein, the 5th relay K5 connects with the 7th relay K7, and is all set in the exchange side inverter circuit INV and off-network On the fire wire cable L of mouthful Load, the 5th relay K5 is set to inverter circuit INV exchange side, the 7th relay K7 be set to from The side network interface Load；6th relay K6 connects with the 8th relay K8, and is all set in inverter circuit INV's and off-network mouth Load On zero curve cable N, the 6th relay K6 is set to inverter circuit INV exchange side, and the 8th relay K8 is set to off-network mouth Load Side.

Bypassing relay unit 12 includes: the 9th relay K9, the tenth relay K10, the tenth relay K10 and the 11st Relay K12.

Wherein, the 9th relay K9 connects with the 11st relay K11, and is all set in simultaneously network interface Grid and off-network mouth On the fire wire cable L of Load, the 9th relay K9 is set to and the side network interface Grid, and the 11st relay K11 is set to off-network mouth The side Load；Tenth relay K10 connects with the 12nd relay K12, and is set to simultaneously network interface Grid and off-network mouth Load zero curve On cable N, the tenth relay K10 is set to and the side network interface Grid, and the 12nd relay K12 is set to the side off-network mouth Load.

It should be noted that energy storage inverter and network interface Grid connect with power grid, the off-network mouth Load of energy storage inverter It is connected with load.

It is worth noting that it is single-phase structure chart that Fig. 2, which is energy storage inverter, each relay unit includes two in Fig. 2 Group relay, every group relay include the relay of two series connections；Wherein a group relay is arranged on fire wire cable, separately One group relay is arranged on zero curve cable.When energy storage inverter is three-phase, referring to Fig. 8, structure is similar with Fig. 2, herein No longer repeat one by one.Unlike, each relay unit includes three group relays, and every group relay is arranged in corresponding phase cable On.

Here, by taking energy storage inverter is single-phase as an example, i.e., when N is 6 and M is 6, to the knot of the controller of energy storage inverter Structure is shown, as follows:

The controller of the energy storage inverter, referring to Fig. 5, comprising: processor 610, the 621, second electricity of first voltage thief hatch Pressure thief hatch 622, tertiary voltage thief hatch 623, the 4th voltage sampling port 624, the 5th voltage sampling port 625 and the 6th voltage are adopted Sample mouth 626, and, the first I/O port 631, the second I/O port 632, third I/O port 633, the 4th I/O port 634, the 5th I/O port 635 and Six I/O ports 636.

First I/O port 631 respectively with grid-connected upper two relays (i.e. first in Fig. 2 of 11 fire wire cable L of relay unit Relay K1 is connected with the control terminal of third relay K3)；Second I/O port 632 respectively with grid-connected 11 zero curve cable of relay unit The control terminal of upper two relays of N (i.e. the second relay K2 and the 4th relay K4 in Fig. 2) is connected；Third I/O port 633 divides Not with upper two relays of 13 fire wire cable L of off-network relay unit (i.e. the 5th relay K5 and the 7th relay in Fig. 2 K7 control terminal) is connected；4th I/O port 634 respectively with upper two relay (the i.e. Fig. 2 of 13 zero curve cable N of off-network relay unit In the 6th relay K6 and the 8th relay K8) control terminal be connected；5th I/O port 635 respectively with bypass relay unit 12 The control terminal of upper two relays of fire wire cable L (i.e. the 9th relay K9 and the 11st relay K11 in Fig. 2) is connected；The Six I/O ports 636 respectively with bypass upper two relays of 12 zero curve cable N of relay unit (i.e. the tenth relay K10 in Fig. 2 and 11st relay K12) control terminal be connected.

First voltage thief hatch 621 receive energy storage inverter and network interface Grid sampled voltage (V1 in such as Fig. 2), namely Sampled voltage between grid-connected relay unit 11 and bypass relay unit 12；Second voltage thief hatch 622 receive it is grid-connected after The midpoint sample voltage (V2 in such as Fig. 2) of electric appliance unit 11；Tertiary voltage thief hatch 623 receives off-network relay unit 13 Midpoint sample voltage (V3 in such as Fig. 2)；The off-network mouth Load sampled voltage of 4th voltage sampling port 624 reception energy storage inverter Sampled voltage between (V4 in such as Fig. 2) namely off-network relay unit 13 and bypass relay unit 12；5th voltage is adopted Sample mouth 625 receives the midpoint sample voltage (V5 in such as Fig. 2) of bypass relay unit 12；6th voltage sampling port 626 receives The exchange side sampled voltage (V6 in such as Fig. 2) namely grid-connected relay unit 11 and off-network relay unit of energy storage inverter Sampled voltage between 13.

And network interface sampled voltage V1 is specifically referred to and the sampled voltage between network interface Grid fire wire cable L and zero curve cable N； The midpoint sample voltage V2 of grid-connected relay unit 11 specifically refers to the first relay K1 and third relay K3 and holds jointly and the Four relay K4 and the second relay K2 hold jointly between sampled voltage；The midpoint sample voltage V3 of off-network relay unit 13 It is common with the 6th relay K6 and the 8th relay K8 to specifically refer to holding jointly for the 5th relay K5 and the 7th relay K7 Sampled voltage between end；Off-network mouth sampled voltage V4 is specifically referred between off-network mouth Load fire wire cable L and zero curve cable N Sampled voltage；The midpoint sample voltage V5 of bypass relay unit 12 specifically refers to the 9th relay K9 and the 11st relay K11 is held jointly and the tenth relay K10 and the 11st relay K12 hold jointly between sampled voltage；Energy storage inverter exchange Side sampled voltage V6 specifically refers to the sampled voltage between the exchange side fire wire cable L and zero curve cable N of inverter circuit INV.

Processor 610, the output signal specifically for controlling 631 to the 6th I/O port 636 of the first I/O port change, and according to the The sampled voltage that one voltage sampling port, 621 to the 6th voltage sampling port 626 receives judges grid-connected relay unit 11, bypass Relay in relay unit 12 and off-network relay unit 13 whether there is failure.

In the present embodiment, processor 610 is realized respectively by six I/O ports for exchanging the relay unit two of side three The control of relay on cable；And the voltage of three relay units between any two is received respectively by six voltage sampling ports And the midpoint sample voltage of three relay units, and then realize for grid-connected relay unit 11, bypass relay unit 12 and the relay in off-network relay unit 13 failure of removal detection, reduce compared with prior art for controller I/O port With the resource occupation of voltage sampling port, and then the cost performance of energy storage inverter is improved.

When energy storage inverter is three-phase, i.e., when N is 12 and M is 9, the structure of the controller of energy storage inverter is carried out Illustrate, as follows referring to Fig. 7:

The controller of the energy storage inverter, referring to Fig. 5, comprising: processor 610, the 621, second electricity of first voltage thief hatch Pressure thief hatch 622, tertiary voltage thief hatch 623, the 4th voltage sampling port 624, the 5th voltage sampling port 625, the 6th voltage are adopted Sample mouth 626, the 7th voltage sampling port 627, the 8th voltage sampling port 628, the 9th voltage sampling port 629, the tenth voltage sampling port 6210, the 11st voltage sampling port 6211 and the 12nd voltage sampling port 6212, and, the first I/O port 631, the second I/O port 632, Third I/O port 633, the 4th I/O port 634, the 5th I/O port 635, the 6th I/O port 636, the 7th I/O port 637, the 8th I/O port 638 and the 9th I/O port 639.

First I/O port 631 respectively with two relay (i.e. the first relays in Fig. 8 on grid-connected relay unit A phase cable Device K1 and the 4th relay K4) control terminal be connected；Second I/O port 632 respectively with two on grid-connected relay unit B phase cable The control terminal of relay (i.e. the second relay K2 and the 5th relay K5 in Fig. 8) is connected；Third I/O port 633 respectively with it is grid-connected The control terminal phase of two relays (i.e. third relay K3 and the 6th relay K6 in Fig. 8) on relay unit C phase cable Even；4th I/O port 634 respectively with two relays on off-network relay unit A phase cable (i.e. the 7th relay K7 in Fig. 8 and Tenth relay K10) control terminal be connected；5th I/O port 635 respectively with two relays on off-network relay unit B phase cable The control terminal of (i.e. the 8th relay K8 and the 11st relay K11 in Fig. 8) is connected；6th I/O port 636 respectively with off-network after The control terminal phase of two relays (i.e. the 9th relay K9 and the 12nd relay K12 in Fig. 8) on electric appliance unit C phase cable Even；7th I/O port 637 respectively with bypass relay unit A phase cable on two relay (i.e. the 13rd relays in Fig. 8 K13 and the 16th relay K16) control terminal be connected；8th I/O port 638 respectively with bypass relay unit B phase cable on two The control terminal of a relay (i.e. the 14th relay K14 and the 17th relay K17 in Fig. 8) is connected；9th I/O port 639 divides Not with bypass relay unit C phase cable on two relays (i.e. the 15th relay K14 and the 18th relay in Fig. 8 K18 control terminal) is connected.

It should be noted that it is any first voltage thief hatch 621 and second voltage thief hatch 622 can be received simultaneously network interface Sampled voltage between two-phase cable, as first voltage thief hatch 621 receives the A phase cable and B phase cable of simultaneously network interface Gird Between sampled voltage, between A phase cable and C phase cable and between B phase cable and C phase cable in any one sampling electricity Pressure, second voltage voltage sampling port 622 receive the sampled voltage of another.

Tertiary voltage thief hatch 623 and the 4th voltage sampling port 624, the 5th voltage sampling port 625 and the 6th voltage sample Mouth 626, the 7th voltage sampling port and the 8th voltage sampling port, the 9th voltage sampling port and the tenth voltage sampling port and the tenth One voltage sampling port and the 12nd voltage sampling port 6212 are set to above-mentioned first voltage thief hatch 621 and second voltage sampling The setting of mouth 622 similarly, receives the sampled voltage between corresponding any two-phase cable, this is no longer going to repeat them, exists In scope of the present application.

For the ease of being explanation, with first voltage thief hatch 621 and second voltage thief hatch 622 for one group, tertiary voltage Thief hatch 623 and the 4th voltage sampling port 624 are one group, and the 5th voltage sampling port 625 and the 6th voltage sampling port 626 are one Group, the 7th voltage sampling port and the 8th voltage sampling port are one group, and the 9th voltage sampling port and the tenth voltage sampling port are one group, And the 11st voltage sampling port and the 12nd voltage sampling port 6212 be one group.

Here, to name a lesser voltage sampling port to receive corresponding A phase cable and B in each group voltage sampling port Sampled voltage between phase cable names another biggish voltage sampling port to receive between corresponding B phase cable and C phase cable Sampled voltage be shown for, wherein name it is smaller, name it is larger be in contrast, such as first voltage thief hatch 621 and second voltage thief hatch 622 in, first voltage thief hatch 621 is to name lesser voltage sampling port, second voltage sampling Mouth 622 is the biggish voltage sampling port of name, i.e. the A phase cable and B phase line of the reception of first voltage thief hatch 621 and network interface Grid Sampled voltage between cable, second voltage thief hatch 622 receives and the sampling between the B phase cable and C phase cable of network interface Grid Voltage.Voltage sampling port receives the case where sampled voltage of any other two-phase cable, no longer repeats one by one, the application's In protection scope.

Specifically, first voltage thief hatch 621 receive energy storage inverter and the first sampled voltage of network interface Gird (such as Fig. 8 In V1)；Second voltage thief hatch 622 receive energy storage inverter and the second sampled voltage of network interface Gird (V2 in such as Fig. 8)； Tertiary voltage thief hatch 623 receives the first midpoint sample voltage (V3 in such as Fig. 8) of grid-connected relay unit；4th voltage is adopted Sample mouth 624 receives the second midpoint sample voltage (V4 in such as Fig. 8) of grid-connected relay unit；5th voltage sampling port 625 connects Receive the first midpoint sample voltage (V5 in such as Fig. 8) of off-network relay unit；6th voltage sampling port 626 receives off-network relay The second midpoint sample voltage (V6 in such as Fig. 8) of device unit；The off-network mouth of 7th voltage sampling port 627 reception energy storage inverter The first sampled voltage of Load (V7 in such as Fig. 8)；The off-network mouth Load second of 8th voltage sampling port 628 reception energy storage inverter Sampled voltage (V8 in such as Fig. 8)；9th voltage sampling port 629 receives the first midpoint sample voltage of bypass relay unit (V9 in such as Fig. 8)；Tenth voltage sampling port 6210 receives the second midpoint sample voltage of bypass relay unit (in such as Fig. 8 V10)；The first sampled voltage of exchange side (V11 in such as Fig. 8) of 11st voltage sampling port 6211 reception energy storage inverter； The second sampled voltage of exchange side (V12 in such as Fig. 8) of 12nd voltage sampling port 6212 reception energy storage inverter.

Processor 610, the output signal specifically for controlling 631 to the 9th I/O port 639 of the first I/O port change, and according to the The sampled voltage that one voltage sampling port, 621 to the 12nd voltage sampling port 6212 receives judges grid-connected relay unit 11, side Relay in road relay unit 12 and off-network relay unit 13 whether there is failure.

The structure of the controller of the above-mentioned energy storage inverter of the structure of the controller of the energy storage inverter of other structures with it is such Seemingly, it no longer repeats one by one, within the scope of protection of this application.

In addition, in the present embodiment, processor 610 is also used to: judging grid-connected relay unit 11, bypass relay The relay of any of unit 12 and off-network relay unit 13 is sent there are when failure to the warning device of energy storage inverter Preset alarm signal, so that user learns that relay failure failure occurs in energy storage inverter.

The mode that the warning device of energy storage inverter is alarmed can be is alarmed by modes such as sound and light, It will not enumerate herein, other can play the type of alarm for informing user, in the range of the application protects.

It should be noted that relay failure includes: not to be closed failure and glue dead failure, wherein not being closed failure is relay Device can not normally closed failure, glue dead failure be relay can not normally open failure, energy storage inverter exchange side it is each A relay any one in above two failure if it exists, may result in energy storage inverter damage, therefore, in energy storage Before inverter works normally, relay fault detection need to be carried out.

Optionally, if N=6, M=6, then become in the output signal that aforementioned present invention implements each I/O port of control being related to Change, and the sampled voltage received according to each voltage sampling port, judges that the relay in each relay unit whether there is Failure is specifically included in conjunction with Fig. 2 and Fig. 6:

(1) the first I/O port 631 and the second I/O port 632 output closure control signal are controlled, and in first voltage thief hatch 621 In the case where thering is voltage drive and 626 no-voltage of the 6th voltage sampling port to motivate, according to first voltage thief hatch 621 and the 6th electricity The sampled voltage that pressure thief hatch 626 receives judges that the relay in grid-connected relay unit 11 whether there is and is not closed failure.

Specifically, by control the first I/O port 631 and the second I/O port 632 output closure control signal, come control first after Electric appliance K1, the second relay K2, third relay K3 and the 4th relay K4 are closed.First voltage thief hatch 621 has voltage The case where excitation may is that energy storage inverter and network interface Grid is connected with power grid；In the following description, first voltage thief hatch 621 modes for having voltage drive are energy storage inverters and network interface Grid is connected with power grid, are no longer repeated one by one；6th voltage 626 no-voltage of thief hatch excitation it may is that: off-network relay unit 13 or bypass relay unit 12 at least one Relay disconnects；And inverter circuit INV does not export electric energy to the 6th voltage sampling port 626.

Judge that the relay in grid-connected relay unit 11 whether there is not to be closed failure and may is that and judges that first voltage is adopted Whether the sampled voltage that sample mouth 621 and the 6th voltage sampling port 626 receive is equal, if so, determining grid-connected relay unit Each relay in 11, which is not present, is not closed failure, otherwise, it is determined that at least one relay in grid-connected relay unit 11 Device, which exists, is not closed failure.

(2) it controls the first I/O port 631 and the second I/O port 632 exports different control signals, and in first voltage thief hatch 621 and the 6th voltage sampling port 626 have voltage drive in the case where, adopted according to first voltage thief hatch 621 and the 6th voltage The sampled voltage that at least one in sample mouth 626 is received with second voltage thief hatch 622 judges in grid-connected relay unit 11 Relay, which whether there is, glues dead failure.

Specifically, different control signals is exported by the first I/O port 631 of control and the second I/O port 632, to control first Relay K1 and third relay K3 is closed and the second relay K2 and the 4th relay K4 is disconnected, alternatively, control the One relay K1 and third relay K3 is disconnected and the second relay K2 and the 4th relay K4 is closed.6th voltage is adopted Sample mouth 626 has the case where voltage drive to may is that the relay in off-network relay unit 13 is closed and bypasses relay list Relay in member 12 is closed；Alternatively, inverter circuit INV exports electric energy to the 6th voltage sampling port 626.

Judge that the relay in grid-connected relay unit 11 whether there is to glue dead failure and may is that and judges that first voltage samples What sampled voltage and second voltage thief hatch 622 that at least one in mouth 621 and the 6th voltage sampling port 626 receives received Whether sampled voltage is equal, if so, determine that dead failure is glued in the relay presence in grid-connected relay unit 11, otherwise, it is determined that There is no glue dead failure with relay in grid-connected relay unit 11.

If the sampled voltage of the sampled voltage and second voltage thief hatch 622 of the 6th voltage sampling port 626 is taken to be judged, The first relay K1 and the second relay K2 is then obtained with the presence or absence of gluing dead failure.And take the sampling of first voltage thief hatch 621 The sampled voltage of voltage and second voltage thief hatch 622 is judged, then obtains third relay K3 and the 4th relay K4 is Dead failure is glued in no presence, and similarly, other relay units also comply with foregoing description, and details are not described herein.

(3) third I/O port 633 and the 4th I/O port 634 output closure control signal are controlled, and in the 6th voltage sampling port 626 In the case that only one has voltage drive in the 4th voltage sampling port 624, according to the 6th voltage sampling port 626 and the 4th voltage The sampled voltage that thief hatch 624 receives judges that the relay in off-network relay unit 13 whether there is and is not closed failure.

Specifically, by control third I/O port 633 and the 4th I/O port 634 output closure control signal, come control the 5th after Electric appliance K5, the 6th relay K6, the 7th relay K7 and the 8th relay K8 are closed.6th voltage sampling port 626 and the 4th Only one has the case where voltage drive to may is that the feelings for having voltage drive in first voltage thief hatch 621 in voltage sampling port 624 Under condition, the relay that the relay in grid-connected relay unit 11 is closed or bypasses in relay unit 12 is closed.

Judge that the relay in off-network relay unit 13 whether there is not to be closed failure and may is that and judges that the 6th voltage is adopted Whether the sampled voltage that sample mouth 626 receives and the 4th voltage sampling port 624 sampled voltage received are equal, if so, sentencing Determine relay in off-network relay unit 13 there is no not being closed failure, otherwise, it is determined that in off-network relay unit 13 after Electric appliance, which exists, is not closed failure.

It should be noted that being sampled in known 4th voltage sampling port 624, the 6th voltage sampling port 626 with first voltage When the sampled voltages that mouth 621 receives should be equal, above-mentioned judgement be can also be according to the 4th voltage sampling port 624 and the 6th electricity The sampled voltage that any one in pressure thief hatch 626 is received with first voltage thief hatch 621, judges off-network relay unit 13 In relay with the presence or absence of not being closed failure.For example, in known first voltage thief hatch 621 and the 4th voltage sampling port 624 In the case that the sampled voltage received is equal, above-mentioned judgement specifically be can be according to first voltage thief hatch 621 and the 6th electricity 626 sampled voltages received for pressing thief hatch judge that the relay in off-network relay unit 13 whether there is and are not closed event Barrier；And it is same in the case where known first voltage thief hatch 621 is equal with the sampled voltage that the 6th voltage sampling port 626 receives Reason, this is no longer going to repeat them.

(4) it controls third I/O port 633 and the 4th I/O port 634 exports different control signals, and in the 6th voltage sampling port 626 and the 4th voltage sampling port 624 have voltage drive in the case where, adopted according to the 4th voltage sampling port 624 and the 6th voltage The sampled voltage that any one in sample mouth 626 is received with tertiary voltage thief hatch 623 judges in off-network relay unit 13 Relay, which whether there is, glues dead failure.

Specifically, different control signals is exported by control third I/O port 633 and the 4th I/O port 634, to control the 5th Relay K5 and the 7th relay K7 is closed and the 6th relay K6 and the 8th relay K8 is disconnected, alternatively, control the Five relay K5 and the 7th relay K7 are disconnected and the 6th relay K6 and the 8th relay K8 is closed.6th voltage is adopted Sample mouth 626 and the 4th voltage sampling port 624, which have the case where voltage drive may is that, has voltage in first voltage thief hatch 621 In the case where excitation, the relay that the relay in grid-connected relay unit 11 is closed and bypasses in relay unit 12 is equal Closure.

Judge that the relay in off-network relay unit 13 whether there is to glue dead failure and may is that and judges the 4th voltage sample What sampled voltage and tertiary voltage thief hatch 623 that any one in mouth 624 and the 6th voltage sampling port 626 receives received Whether sampled voltage is equal, if so, the relay in judgement off-network relay unit 13, which exists, glues dead failure, otherwise, it is determined that There is no glue dead failure with relay in off-network relay unit 13.

It should be noted that if at least one in known 4th voltage sampling port 624 and/or the 6th voltage sampling port 626 When the sampled voltage received is equal with the sampled voltage that first voltage thief hatch 621 receives, above-mentioned judgement can also be root According to the sampled voltage that first voltage thief hatch 621 and tertiary voltage thief hatch 623 receive, judge in off-network relay unit 13 Relay with the presence or absence of gluing dead failure.

(5) the 5th I/O port 635 and the 6th I/O port 636 output closure control signal are controlled, and in first voltage thief hatch 621 In the case where thering is voltage drive and 624 no-voltage of the 4th voltage sampling port to motivate, according to first voltage thief hatch 621 and the 4th electricity The sampled voltage that pressure thief hatch 624 receives judges that the relay in bypass relay unit 12 whether there is and is not closed failure.

Specifically, by control the 5th I/O port 635 and the 6th I/O port 636 output closure control signal, come control the 9th after Electric appliance K9, the tenth relay K10, the 11st relay K11 and the 12nd relay K12 are closed.4th voltage sampling port 624 The case where no-voltage motivates may is that power grid does not pass through off-network relay unit 13 and grid-connected relay unit 11 to the 4th voltage Thief hatch 624 exports electric energy, alternatively, not pass through off-network relay unit 13 defeated to the 4th voltage sampling port 624 by inverter circuit INV Electric energy out.

Relay in judgement bypass relay unit 12, which whether there is not to be closed failure and may is that, judges that first voltage is adopted Whether sample mouth 621 and the 4th voltage sampling port 624 sampled voltage received are equal, if so, determining bypass relay unit Relay in 12 is not there is no failure is closed, otherwise, it is determined that the relay in bypass relay unit 12, which exists, is not closed event Barrier.

(6) it controls the 5th I/O port 635 and the 6th I/O port 636 exports different control signals, and in first voltage thief hatch 621 and the 4th voltage sampling port 624 have voltage drive in the case where, adopted according to first voltage thief hatch 621 and the 4th voltage The sampled voltage that any one in sample mouth 624 is received with the 5th voltage sampling port 625 judges to bypass in relay unit 12 Relay, which whether there is, glues dead failure.

Specifically, different control signals is exported by the 5th I/O port 635 of control and the 6th I/O port 636, to control the 9th Relay K9 and the 11st relay K11 is closed and the tenth relay K10 and the 12nd relay K12 is disconnected, alternatively, Control that the 9th relay K9 and the 11st relay K11 is disconnected and the tenth relay K10 and the 12nd relay K12 is closed It closes.4th voltage sampling port 624 have voltage drive it may is that: power grid passes through grid-connected relay unit 11 and off-network relay Unit 13 exports electric energy to the 4th voltage sampling port 624, alternatively, inverter circuit INV passes through off-network relay unit 13 to the 4th Voltage sampling port 624 exports electric energy.

Relay in judgement bypass relay unit 12, which whether there is to glue dead failure and may is that, judges that first voltage samples What the sampled voltage and the 5th voltage sampling port 625 that any one in mouth 621 and the 4th voltage sampling port 624 receives received Whether sampled voltage is equal, if so, the relay in judgement bypass relay unit 12, which exists, glues dead failure, otherwise, it is determined that There is no glue dead failure with relay in bypass relay unit 12.

It should be noted that the sequence of above-mentioned (1) to (6) can arbitrarily sort, said sequence is only a kind of example, herein It does not do sequence to limit, the random order of (1) to (6) is within the scope of protection of this application.

If N=12, M=9, then implement the output signal variation for each I/O port of control being related to, and root in aforementioned present invention According to the sampled voltage that each voltage sampling port receives, judge the relay in each relay unit with the presence or absence of failure, knot Fig. 7 and Fig. 8 is closed, is specifically included:

(1) the first I/O port 631, the second I/O port 632 and the output closure control signal of third I/O port 633 are controlled, and first Voltage sampling port 621 and second voltage thief hatch 622 have the 6211 and the 12nd electricity of voltage drive and the 11st voltage sampling port In the case where pressing the excitation of the equal no-voltage of thief hatch 6212, according to first voltage thief hatch 621, second voltage thief hatch the 622, the tenth The sampled voltage that one voltage sampling port 6211 and the 12nd voltage sampling port 6212 receive judges in grid-connected relay unit 11 Relay with the presence or absence of not being closed failure.

Specifically, by the first I/O port 631 of control, the second I/O port 632 and the output closure control signal of third I/O port 633, To control the first relay K1, the second relay K2, third relay K3, the 4th relay K4, the 5th relay K5 and the 6th Relay K6 is closed.

It should be noted that having the case where voltage drive may is that is directly or indirectly connected to power grid, or directly or The electric energy of inverter circuit INV output is received indirectly.It is to control it to be connected to electricity that control voltage sampling port, which has voltage drive, Net or the electric energy for receiving inverter circuit INV output.Specifically, first voltage thief hatch 621 and second voltage thief hatch 622 are equal Have that the case where voltage drive may is that energy storage inverter and network interface Grid is connected with power grid；11st voltage sampling port 6211 It may is that off-network relay unit 13 or bypass relay list with the case where equal no-voltage of the 12nd voltage sampling port 6212 excitation The relay of at least one in member 12 disconnects；And inverter circuit INV does not export electric energy, In to the 11st voltage sampling port 6211 In following the description whether have voltage drive may refer to described herein as, no longer repeat one by one.

Judge that relay unit may is that in any two group relays unit, only with the presence or absence of the principle for not being closed failure In the case where thering is one end to have voltage drive, judge whether the voltage at any two group relay both ends is equal, the relay if equal For device unit there is no failure is not closed, the relay unit, which exists, if unequal is not closed failure.

Specifically, judging that grid-connected relay unit whether there is is not closed failure are as follows: judge 621 He of first voltage thief hatch The sampled voltage that 11st voltage sampling port 6211 receives is equal and second voltage thief hatch 622 and the 12nd voltage are adopted The sampled voltage that sample mouth 6212 receives is equal, if meets simultaneously, if meeting simultaneously, which is not deposited It is not closed failure, if not meeting simultaneously, which, which exists, is not closed failure.Judge in the following description Other relay units may refer to described herein as with the presence or absence of not being closed failure, no longer repeat one by one.

(2) the first I/O port 631, the second I/O port 632 and the identical control signal of the uneven output of third I/O port 633 are controlled, and At least one has voltage drive and the 11st voltage sampling port in first voltage thief hatch 621 and second voltage thief hatch 622 In the case that corresponding voltage sampling port has voltage drive in 6211 and the 12nd voltage sampling port 6212, adopted according to first voltage In sample mouth 621, second voltage thief hatch 622, the 11st voltage sampling port 6211 and the 12nd voltage sampling port 6212, at least one A voltage sampling port for having voltage drive is adopted with corresponding voltage in tertiary voltage thief hatch 623 and the 4th voltage sampling port 624 The sampled voltage that sample mouth receives judges that the relay in grid-connected relay unit 11 whether there is and glues dead failure.

Specifically, passing through the first I/O port 631 of control, the second I/O port 632 and the identical control of the uneven output of third I/O port 633 Signal, come control the first relay K1, the second relay K2, third relay K3, the 4th relay K4, the 5th relay K5 and 6th relay K6 unevenness closure or uneven disconnection, i.e. the first relay K1, the second relay K2, third relay K3, the 4th Part relay is closed in relay K4, the 5th relay K5 and the 6th relay K6, and another part relay disconnects.

Judge that relay unit may is that in a relay unit with the presence or absence of the principle for gluing dead failure, the relay There is under voltage drive at least one end in device unit, can be when there is three group relays has voltage to swash between only two group relays It encourages, is also possible to have voltage drive between three group relays.Judging any two groups has the midpoint of the relay of voltage drive to adopt Sample voltage or not it is equal to the sampled voltage for having the thief hatch of voltage drive, the relay unit, which exists, if equal glues dead failure, There is no glue dead failure to the relay unit if unequal.

Specifically, judging that grid-connected whether viscous extremely may is that of relay unit 11 judges first voltage thief hatch 621 and the tenth Any one in one voltage sampling port 6211, second voltage sampling equal with the sampled voltage that tertiary voltage thief hatch receives Any one in the 622 and the 12nd voltage sampling port 6212 of mouth, the sampled voltage phase received with the 4th voltage sampling port 624 Deng, if meet any one of the above situation, if meeting any one of the above situation, grid-connected relay unit 11 exists viscous dead Failure, if any one of the above situation is not satisfied, there is no glue dead failure to grid-connected relay unit 11.In the following description Judge that other relay units may refer to described herein as with the presence or absence of gluing dead failure, no longer repeats one by one.

(3) control the 4th I/O port 634, the 5th I/O port 635 and the 6th I/O port 636 exports closure and control signal, and the 11 voltage sampling ports 6211 and the 12nd voltage sampling port 6212 have 627 He of voltage drive or the 7th voltage sampling port In the case that 8th voltage sampling port 628 has voltage drive, according to the 7th voltage sampling port 627, the 8th voltage sampling port 628, the sampled voltage that the 11st voltage sampling port 6211 and the 12nd voltage sampling port 6212 receive judges off-network relay Relay in unit 13, which whether there is, is not closed failure.

Specifically, exporting closure control letter by the 4th I/O port 634 of control, the 5th I/O port 635 and the 6th I/O port 636 Number, to control the 7th relay K7, the 8th relay K8, the 9th relay K9, the tenth relay K10, the 11st relay K11 It is closed with the 12nd relay K12.

(4) the 4th I/O port 634, the 5th I/O port 635 and the identical control signal of the uneven output of the 6th I/O port 636 are controlled, and At least one has voltage drive and the 7th voltage to adopt in the 11st voltage sampling port 6211 and the 12nd voltage sampling port 6212 In the case that corresponding voltage sampling port has voltage drive in sample mouth 627 and the 8th voltage sampling port 628, according to the 7th voltage In thief hatch 627, the 8th voltage sampling port 628, the 11st voltage sampling port 6211 and the 12nd voltage sampling port 6212 at least One has the voltage sampling port of voltage drive, with corresponding voltage in the 5th voltage sampling port 625 and the 6th voltage sampling port 626 The sampled voltage that thief hatch receives judges that the relay in off-network relay unit whether there is and glues dead failure.

Specifically, passing through the 4th I/O port 634 of control, the 5th I/O port 635 and the identical control of the uneven output of the 6th I/O port 636 Signal, to control the 7th relay K7, the 8th relay K8, the 9th relay K9, the tenth relay K10, the 11st relay K11 and the 12nd relay K12 unevenness closing or opening.

(5) control the 7th I/O port 637, the 8th I/O port 638 and the 9th I/O port 639 exports closure and control signal, and the One voltage sampling port 621 and second voltage thief hatch 622 have voltage drive and the 7th voltage sampling port 627 and the 8th voltage In the case that the equal no-voltage of thief hatch 628 motivates, according to first voltage thief hatch 621, the 622, the 7th electricity of second voltage thief hatch The sampled voltage that pressure thief hatch 627 and the 8th voltage sampling port 628 receive judges that the relay bypassed in relay unit is No presence is not closed failure.

Specifically, exporting closure control letter by the 7th I/O port 637 of control, the 8th I/O port 638 and the 9th I/O port 639 Number, to control the 13rd relay K13, the 14th relay K14, the 15th relay K15, the 16th relay K16, the tenth Seven relay K17 and the 18th relay K18 are closed.

(6) closure control signal cannot be exported by controlling the 7th I/O port 637, the 8th I/O port 638 and the 9th I/O port 639, and In first voltage thief hatch 621 and second voltage thief hatch 622, at least one has voltage drive and the 7th voltage sampling port 627 and the 8th corresponding voltage sampling port in voltage sampling port 628 have voltage drive in the case where, according to first voltage thief hatch 621, at least one in second voltage thief hatch 622, the 7th voltage sampling port 627 and the 8th voltage sampling port 628 has voltage to swash The voltage sampling port encouraged is received with voltage sampling port corresponding in the 9th voltage sampling port 629 and the tenth voltage sampling port 6210 The sampled voltage arrived judges that the relay in bypass relay unit whether there is and glues dead failure.

Specifically, passing through the 7th I/O port 637 of control, the 8th I/O port 638 and the identical control of the uneven output of the 9th I/O port 639 Signal, to control the 13rd relay K13, the 14th relay K14, the 15th relay K15, the 16th relay K16, 17 relay K17 and the 18th relay K18 unevenness closing or opening.

When energy storage inverter is other phases, may refer to above-mentioned energy storage inverter is single-phase situation, not another herein One repeats, within the scope of protection of this application.

Optionally, referring to Fig. 3, processor 610 involved in the embodiments of the present invention judge grid-connected relay unit 11, Bypassing the relay in relay unit 12 and off-network relay unit 13 whether there is the sequence of failure are as follows:

Relay in S301, judgement bypass relay unit 12, which whether there is, is not closed failure.

It should be noted that all relay tests that energy storage inverter exchanges side are equal before energy storage inverter detection It disconnects, energy storage inverter stops working.

This step S301 whether there is with the relay in the relay unit 12 of judgement bypass described in above-mentioned (5) not to be closed The implementation procedure for closing failure is identical with principle, and details are not described herein.If the relay bypassed in relay unit 12 is not present not It is closed failure, thens follow the steps S302, otherwise, it is determined that the relay in bypass relay unit 12, which exists, is not closed failure, and Preset alarm signal is sent to the warning device of energy storage inverter, terminates detection.

S302, judge relay in grid-connected relay unit 11 with the presence or absence of not being closed failure.

This step S302 whether there is with the relay judged in grid-connected relay unit 11 described in above-mentioned (1) not to be closed The implementation procedure for closing failure is identical with principle, and details are not described herein.If there is no not for the relay in grid-connected relay unit 11 It is closed failure, thens follow the steps S303, otherwise, it is determined that the relay in grid-connected relay unit 11, which exists, is not closed failure, and Preset alarm signal is sent to the warning device of energy storage inverter, terminates detection.

S303, judge relay in grid-connected relay unit 11 with the presence or absence of gluing dead failure.

Judge that the relay in grid-connected relay unit 11 is dead with the presence or absence of gluing described in this step S303 and above-mentioned (2) The implementation procedure of failure is identical with principle, and details are not described herein.If there is no viscous dead for the relay in grid-connected relay unit 11 Failure thens follow the steps S304, otherwise, it is determined that relay in grid-connected relay unit 11, which exists, glues dead failure, and to energy storage The warning device of inverter sends preset alarm signal, terminates detection.

Relay in S304, judgement bypass relay unit 12, which whether there is, glues dead failure.

Judge that the relay in bypass relay unit 12 is dead with the presence or absence of gluing described in this step S304 and above-mentioned (6) The implementation procedure of failure is identical with principle, and details are not described herein.If the relay bypassed in relay unit 12 is dead there is no gluing Failure thens follow the steps S305, otherwise, it is determined that the relay in bypass relay unit 12, which exists, glues dead failure, and to energy storage The warning device of inverter sends preset alarm signal, terminates detection.

S305, judge relay in off-network relay unit 13 with the presence or absence of not being closed failure.

This step S305 whether there is with the relay in judgement off-network relay unit 13 described in above-mentioned (3) not to be closed The implementation procedure for closing failure is identical with principle, and details are not described herein.If there is no not for the relay in off-network relay unit 13 It is closed failure, thens follow the steps S305, otherwise, it is determined that the relay in off-network relay unit 13, which exists, is not closed failure, and Preset alarm signal is sent to the warning device of energy storage inverter, terminates detection.

S306, judge relay in off-network relay unit 13 with the presence or absence of gluing dead failure.

This step S306 is with the relay in judgement off-network relay unit 13 described in above-mentioned (4) with the presence or absence of viscous dead The implementation procedure of failure is identical with principle, and details are not described herein.If there is no viscous dead for the relay in off-network relay unit 13 Failure thens follow the steps S307, otherwise, it is determined that relay in off-network relay unit 13, which exists, glues dead failure, and to energy storage The warning device of inverter sends preset alarm signal, terminates detection.

S307, determine that grid-connected relay unit 11, off-network relay unit 13 and bypass relay unit 12 are not present Failure.

It should be noted that the sequence of above-mentioned steps S301 to above-mentioned steps S307 is only to realize relay in energy storage inverter A kind of less embodiment of device on-off times；In practical applications, other sequences also can be used in step S301 to step S307 Different embodiments is constituted, details are not described herein, within the scope of protection of this application.

In the present embodiment, processor 610 judges grid-connected relay unit 11, bypass relay unit 12 and off-network relay Relay in device unit 13 whether there is the sequence of failure so that in energy storage inverter each relay switch motion number It is less, and then avoid the problem that relay aging due to switch motion is excessive, extend the service life of relay.

It should be noted that above-mentioned be described in detail with energy storage inverter to be single-phase, it is only a kind of in the present embodiment Example, the control process of the controller of the energy storage inverter in the case of other be not another herein reference can be made to above description obtains One repeats, within the scope of protection of this application.

Because household energy storage inverter replacement power transfer relay generally uses complete machine substitute mode, certain can't be individually replaced The relay of a damage, in addition, to guarantee the quality consistency of machine, and often being used for machine maintenance after sale Replacement problem circuit board mode, the relay without individually welding some damage of replacement；So it is inverse not need positioning energy storage Become device exchange side in which relay damaged, if but require any one relay failure after can be detected, after detecting It can also alarm, so that maintenance personal is determined the relay in energy storage inverter exchange side, there are failures.

Therefore, when judging whether each relay unit glues dead failure, the midpoint of relay unit can be adopted Sample voltage is compared with the sampled voltage of one end of relay unit, without carrying out with the respective sampled voltage in both ends Compare.

It is of course also possible to be by the sampled voltage at the both ends of the midpoint sample voltage of relay unit and relay unit into Row compares, and obtains specifically gluing dead relay.

Optionally, in an alternative embodiment of the invention, above-mentioned processor 610 judge grid-connected relay unit 11, bypass after Relay in electric appliance unit 12 and off-network relay unit 13 whether there is the sequence of failure, specifically may is that

Step 1, the feelings for having voltage drive and the excitation of 624 no-voltage of the 4th voltage sampling port in first voltage thief hatch 621 Under condition, controls the 5th I/O port 635 and the 6th I/O port 636 exports closure control signal.

Whether step 2, the sampled voltage for judging that the 4th voltage sampling port 624 receives are equal to first voltage thief hatch 621 The sampled voltage received.

Wherein, if the sampled voltage that the 4th voltage sampling port 624 receives is equal to what first voltage thief hatch 621 received Sampled voltage then determines that the relay in bypass relay unit 12 is not present and is not closed failure, and executes step 3；If the 4th The sampled voltage that voltage sampling port 624 receives is not equal to the sampled voltage that first voltage thief hatch 621 receives, then determines side Relay in road relay unit 12, which exists, is not closed failure, and terminates to detect.

Step 3, control energy storage inverter are run with voltage source mode, the sampling for receiving the 6th voltage sampling port 626 Voltage is equal to the sampled voltage that first voltage thief hatch 621 receives.

Wherein, the sampling that the sampled voltage and first voltage thief hatch 621 that the 6th voltage sampling port 626 receives receive Voltage is the same as the same amplitude of frequency.

Step 4, the first I/O port 631 of control and the second I/O port 632 export closure control signal.

Step 5, control energy storage inverter are out of service, motivate 626 no-voltage of the 6th voltage sampling port.

Whether step 6, the sampled voltage for judging that the 6th voltage sampling port 626 receives are equal to first voltage thief hatch 621 The sampled voltage received.

Wherein, if the sampled voltage that the 6th voltage sampling port 626 receives is equal to what first voltage thief hatch 621 received Sampled voltage then determines that the relay in grid-connected relay unit 11 is not present and is not closed failure, and executes step 7；If the 6th The sampled voltage that voltage sampling port 626 receives is not equal to the sampled voltage that first voltage thief hatch 621 receives, then determines simultaneously Relay in network relay unit 11, which exists, is not closed failure, and terminates to detect.

Step 7, control third I/O port 633 and the 4th I/O port 634 output closure control signal, make the 6th voltage sampling port 626 receive the voltage drive of power grid output by off-network relay unit 13 and bypass relay unit 12.

Step 8, control the first I/O port 631 output disconnect control signal, and control the second I/O port 632 output closure control letter Number, judge whether sampled voltage that second voltage thief hatch 622 receives is equal to first voltage thief hatch 621 and the 6th voltage is adopted The sampled voltage that any one in sample mouth 626 receives.

If so, it is viscous dead to determine that at least one of upper two relays of grid-connected 11 fire wire cable L of relay unit exist Failure, and terminate to detect；Otherwise, it is determined that viscous dead event is not present in grid-connected upper two relays of 11 fire wire cable L of relay unit Barrier, and execute step 9.

Step 9, control the first I/O port 631 output closure control signal, and control the output of the second I/O port 632 and disconnect control letter Number, judge whether sampled voltage that second voltage thief hatch 622 receives is equal to first voltage thief hatch 621 and the 6th voltage is adopted The sampled voltage that any one in sample mouth 626 receives.

If so, it is viscous dead to determine that at least one of grid-connected 11 upper two relays of zero curve cable N of relay unit exist Failure, and terminate to detect；Otherwise, it is determined that viscous dead event is not present in upper two relays of grid-connected 11 zero curve cable N of relay unit Barrier, and execute step 10.

Step 10, the first I/O port 631 of control and the second I/O port 632 export closure control signal, make the 4th voltage Thief hatch receives the voltage drive of power grid output by described and network relay and the off-network relay.

Step 11, control energy storage inverter are run with current source mode, and energy storage inverter is made normally to generate electricity by way of merging two or more grid systems.

Step 12, control the 5th I/O port 635 output disconnect control signal, and control the output closure control of the 6th I/O port 636 Whether signal, the sampled voltage for judging that the 5th voltage sampling port 625 receives are equal to first voltage thief hatch 621 and the 4th voltage Any one sampled voltage that receives of thief hatch 624.

If so, it is viscous dead to determine that at least one of bypass upper two relays of 12 fire wire cable L of relay unit exist Failure, and terminate to detect；Otherwise, it is determined that viscous dead event is not present in bypass upper two relays of 12 fire wire cable L of relay unit Barrier, and execute step 13.

Step 13, control the 5th I/O port 635 output closure control signal, and control the output of the 6th I/O port 636 and disconnect control Whether signal, the sampled voltage for judging that the 5th voltage sampling port 625 receives are equal to first voltage thief hatch 621 and the 4th voltage Any one sampled voltage that receives of thief hatch 624.

If so, it is viscous dead to determine that at least one of bypass 12 upper two relays of zero curve cable N of relay unit exist Failure, and terminate to detect；Otherwise, it is determined that viscous dead event is not present in bypass upper two relays of 12 zero curve cable N of relay unit Barrier, and execute step 14.

Whether step 14, the sampled voltage for judging that the 4th voltage sampling port 624 receives are equal to the 6th voltage sampling port 626 The sampled voltage received.

If so, the relay in judgement off-network relay unit 13 is not present and is not closed failure, and execute step 15；It is no Then, determine that the relay in off-network relay unit 13 exists and be not closed failure, and terminate to detect.

Step 15, the 5th I/O port 635 of control and the 6th IO export closure control signal, make the 4th voltage sampling port 624 The voltage drive of power grid output is received by bypass relay unit 12.

Step 16, the control output of third I/O port 633 disconnect control signal, and control the output closure control of the 4th I/O port 634 Signal judges that whether sampled voltage that tertiary voltage thief hatch 623 receives be equal to that first voltage thief hatch 621 receives adopts Sample voltage.

If so, it is viscous dead to determine that at least one of upper two relays of 13 fire wire cable L of off-network relay unit exist Failure, and terminate to detect；Otherwise, it is determined that viscous dead event is not present in upper two relays of 13 fire wire cable L of off-network relay unit Barrier, and execute step 17.

Step 17, the control output closure control signal of third I/O port 633, and control the output of the 4th I/O port 634 and disconnect control Signal judges that whether sampled voltage that tertiary voltage thief hatch 623 receives be equal to that first voltage thief hatch 621 receives adopts Sample voltage.

If so, it is viscous dead to determine that at least one of 13 upper two relays of zero curve cable N of off-network relay unit exist Failure；Otherwise, it is determined that upper two relays of 13 zero curve cable N of off-network relay unit are not present and glue dead failure, that is, determine simultaneously Failure is not present in network relay unit 11, off-network relay unit 13 and bypass relay unit 12.

It should be noted that detecting grid-connected relay unit 11, off-network relay unit 13 and bypass relay list Member 12 there is failure in any one, send preset alarm signal to the warning device of energy storage inverter, to notify maintenance people Member is safeguarded, wherein the preset alarm signal that different relay units is issued there are failure can be different, so as to repair people Member learns which relay unit the relay unit to break down is specifically.Not being closed failure can be as accurate as relay list Member, gluing dead failure can be as accurate as relay on relay or zero curve cable N in relay unit on fire wire cable L.

Relay and zero curve line when judging that the relay in same relay unit glues dead failure, on fire wire cable L The judgement sequence that relay on cable N is not fixed, it is interchangeable.Therefore, above-mentioned steps 8 and it is above-mentioned can be interchanged in step 9, on State step 12 and it is above-mentioned can be interchanged in step 13, above-mentioned steps 16 and it is above-mentioned can be interchanged in step 17, and, above-mentioned steps 13 and above-mentioned steps 14 can be interchanged, the present embodiment is only a kind of example, step 8, step 9, step 12, step 13 and step 14 Other sequence, within the scope of protection of this application.

Judgement sequence in the present embodiment, so that in relay test failure process in energy storage inverter, not only The action frequency of relay in energy storage inverter is less, and detection time used time is short；It can also enough proof loads are at the first time Must be electric, and do not power off in the detection process, important load normal use is not influenced；In addition, energy storage inverter can also be made as early as possible It generates electricity by way of merging two or more grid systems, guarantees income.

The embodiment of the invention discloses a kind of energy storage inverters, referring to fig. 4, comprising: inverter circuit 510 is set to inversion Circuit 510 exchanges the grid-connected relay unit 520 of side, off-network relay unit 530, bypasses relay unit 540 and above-mentioned The controller 550 of energy storage inverter described in one embodiment；

Grid-connected relay unit 520 be set to inverter circuit 510 exchange side and energy storage inverter and between network interface, off-network Relay unit 530 is set to inverter circuit 510 and exchanges between side and the off-network mouth of energy storage inverter, bypasses relay unit 540 are set to and between network interface and off-network mouth.

The structure and working principle description of the controller 550 of energy storage inverter can be found in above-described embodiment, herein no longer It repeats one by one.

All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein as separation The unit of part description may or may not be physically separated, component shown as a unit can be or It can not be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to reality Border needs to select some or all of the modules therein to achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art It can understand and implement without creative efforts.

Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered Think beyond the scope of this invention.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims

1. a kind of controller of energy storage inverter, which is characterized in that exchange grid-connected relay unit, the side of side with energy storage inverter Road relay unit and off-network relay unit are connected；The controller of the energy storage inverter includes: that processor, N number of voltage are adopted Sample mouth and M I/O port；N=6 and M=6, alternatively, N=12 and M=9；Wherein:

The processor is used to control the output signal variation of each I/O port, and the sampling received according to each voltage sampling port Voltage judges the relay in grid-connected relay unit, bypass relay unit and off-network relay unit with the presence or absence of failure.

2. the controller of energy storage inverter according to claim 1, which is characterized in that N=6 and M=6, N number of voltage sample Mouth is respectively the first to the 6th voltage sampling port, and M I/O port is respectively the first to the 6th I/O port；Wherein:

First I/O port is connected with the control terminal of two relays on the grid-connected relay unit fire wire cable respectively；Second I/O port It is connected respectively with the control terminal of two relays on the grid-connected relay unit zero curve cable；Third I/O port respectively with it is described from The control terminal of two relays is connected on network relay unit fire wire cable；4th I/O port respectively with the off-network relay unit The control terminal of two relays is connected on zero curve cable；5th I/O port is respectively on the bypass relay unit fire wire cable two The control terminal of a relay is connected；The control with two relays on the bypass relay unit zero curve cable respectively of 6th I/O port End processed is connected；

First voltage thief hatch receives the energy storage inverter and network interface sampled voltage；The reception of second voltage thief hatch is described simultaneously The midpoint sample voltage of network relay unit；Tertiary voltage thief hatch receives the midpoint sample electricity of the off-network relay unit Pressure；4th voltage sampling port receives the off-network mouth sampled voltage of the energy storage inverter；5th voltage sampling port receives the side The midpoint sample voltage of road relay unit；6th voltage sampling port receives the exchange side sampled voltage of the energy storage inverter.

3. the controller of energy storage inverter according to claim 2, which is characterized in that the processor is each for controlling The output signal of I/O port changes, and the sampled voltage received according to each voltage sampling port, judges grid-connected relay unit, side When relay in road relay unit and off-network relay unit whether there is failure, it is specifically used for:

First I/O port and second I/O port output closure control signal are controlled, and has electricity in the first voltage thief hatch In the case that pressure excitation and the 6th voltage sampling port no-voltage motivate, according to the first voltage thief hatch and the described 6th The sampled voltage that voltage sampling port receives judges that the relay in the grid-connected relay unit whether there is and is not closed event Barrier；

It controls first I/O port and second I/O port exports different control signals, and in first voltage thief hatch and described In the case that 6th voltage sampling port has voltage drive, according to the first voltage thief hatch and the 6th voltage sampling port In at least one sampled voltage for being received with the second voltage thief hatch, judge the relay in the grid-connected relay unit Device, which whether there is, glues dead failure；

The third I/O port and the 4th I/O port output closure control signal are controlled, and in the 6th voltage sampling port and institute It states in the case that only one has voltage drive in the 4th voltage sampling port, according to the 6th voltage sampling port and the 4th electricity The sampled voltage that pressure thief hatch receives judges that the relay in the off-network relay unit whether there is and is not closed failure；

Control the third I/O port and the 4th I/O port export different control signals, and in the 6th voltage sampling port and In the case that 4th voltage sampling port has voltage drive, adopted according to the 4th voltage sampling port and the 6th voltage The sampled voltage that any one in sample mouth is received with the tertiary voltage thief hatch judges in the off-network relay unit Relay, which whether there is, glues dead failure；

The 5th I/O port and the 6th I/O port output closure control signal are controlled, and has electricity in the first voltage thief hatch In the case that pressure excitation and the 4th voltage sampling port no-voltage motivate, according to the first voltage thief hatch and the described 4th The sampled voltage that voltage sampling port receives judges that the relay in the bypass relay unit whether there is and is not closed event Barrier；

And

It controls the 5th I/O port and the 6th I/O port exports different control signals, and in the first voltage thief hatch In the case where having voltage drive with the 4th voltage sampling port, according to the first voltage thief hatch and the 4th voltage The sampled voltage that any one in thief hatch is received with the 5th voltage sampling port judges in the bypass relay unit Relay with the presence or absence of gluing dead failure.

4. the controller of energy storage inverter according to claim 3, which is characterized in that the processor judges described grid-connected Relay in relay unit, the bypass relay unit and the off-network relay unit whether there is the sequence of failure Are as follows:

If the relay in the bypass relay unit judges in the grid-connected relay unit there is no failure is not closed Relay with the presence or absence of not being closed failure；

If the relay in the grid-connected relay unit judges in the grid-connected relay unit there is no failure is not closed Relay with the presence or absence of gluing dead failure；

If the relay in the grid-connected relay unit judges in the bypass relay unit there is no dead failure is glued Relay, which whether there is, glues dead failure；

If the relay in the bypass relay unit judges in the off-network relay unit there is no dead failure is glued Relay, which whether there is, is not closed failure；

If the relay in the off-network relay unit judges in the off-network relay unit there is no failure is not closed Relay with the presence or absence of gluing dead failure；

If the relay in the off-network relay unit determines the grid-connected relay unit, institute there is no dead failure is glued It states off-network relay unit and failure is not present in the bypass relay unit.

5. the controller of energy storage inverter according to claim 4, which is characterized in that control the 5th I/O port and described 6th I/O port output closure control signal, and have voltage drive and the 4th voltage sampling port in the first voltage thief hatch In the case that no-voltage motivates, the sampling received according to the first voltage thief hatch and the 4th voltage sampling port is electric Pressure judges that the relay in the bypass relay unit whether there is and is not closed failure, comprising:

In the case where the first voltage thief hatch has voltage drive and the 4th voltage sampling port no-voltage motivates, control 5th I/O port and the 6th I/O port export closure control signal；

Judge whether the sampled voltage that the 4th voltage sampling port receives is equal to what the first voltage thief hatch received Sampled voltage；

Wherein, if the sampled voltage that the 4th voltage sampling port receives is adopted equal to what the first voltage thief hatch received Sample voltage then determines that the relay in the bypass relay unit is not present and is not closed failure；If the 4th voltage sample The sampled voltage that mouth receives is not equal to the sampled voltage that the first voltage thief hatch receives, then determines the bypass relay Relay in device unit, which exists, is not closed failure.

6. the controller of energy storage inverter according to claim 4, which is characterized in that control first I/O port and described Second I/O port output closure control signal, and have voltage drive and the 6th voltage sampling port in the first voltage thief hatch In the case that no-voltage motivates, the sampling received according to the first voltage thief hatch and the 6th voltage sampling port is electric Pressure judges that the relay in the grid-connected relay unit whether there is and is not closed failure, comprising:

It controls the energy storage inverter to run with voltage source mode, the sampled voltage etc. for receiving the 6th voltage sampling port In the sampled voltage that the first voltage thief hatch receives；

Judge whether the sampled voltage that the 6th voltage sampling port receives is equal to what the first voltage thief hatch received Sampled voltage；

Wherein, if the sampled voltage that the 6th voltage sampling port receives is adopted equal to what the first voltage thief hatch received Sample voltage then determines that the relay in the grid-connected relay unit is not present and is not closed failure；If the 6th voltage sample The sampled voltage that mouth receives is not equal to the sampled voltage that the first voltage thief hatch receives, then determines the grid-connected relay Relay in device unit, which exists, is not closed failure.

7. according to right want 4 described in energy storage inverter controller, which is characterized in that control first I/O port and described the Two I/O ports export different control signals, and have voltage to swash in the first voltage thief hatch and the 6th voltage sampling port In the case where encouraging, according at least one in the first voltage thief hatch and the 6th voltage sampling port and the second voltage The sampled voltage that thief hatch receives judges that the relay in the grid-connected relay unit whether there is and glues dead failure, comprising:

The third I/O port and the 4th I/O port output closure control signal are controlled, the 6th voltage sampling port is made to pass through institute It states off-network relay unit and the bypass relay unit receives the voltage drive of power grid output；

It controls the first I/O port output and disconnects control signal, and control the second I/O port output closure control signal, judgement Whether the sampled voltage that the second voltage thief hatch receives is equal to the first voltage thief hatch and the 6th voltage is adopted The sampled voltage that any one in sample mouth receives；If so, determine on the grid-connected relay unit fire wire cable two after At least one of electric appliance, which exists, glues dead failure；Otherwise, it is determined that two relays on the grid-connected relay unit fire wire cable There is no glue dead failure；

The first I/O port output closure control signal is controlled, and controls the second I/O port output and disconnects control signal, judgement Whether the sampled voltage that the second voltage thief hatch receives is equal to the first voltage thief hatch and the 6th voltage is adopted The sampled voltage that any one in sample mouth receives；If so, determine on the grid-connected relay unit zero curve cable two after At least one of electric appliance, which exists, glues dead failure；Otherwise, it is determined that two relays on the grid-connected relay unit zero curve cable There is no glue dead failure.

8. the controller of energy storage inverter according to claim 4, which is characterized in that control the 5th I/O port and described 6th I/O port exports different control signals, and has voltage in the first voltage thief hatch and the 4th voltage sampling port In the case where excitation, according to any one in the first voltage thief hatch and the 4th voltage sampling port and the 5th electricity The sampled voltage that pressure thief hatch receives judges that the relay in the bypass relay unit with the presence or absence of dead failure is glued, wraps It includes:

It controls first I/O port and second I/O port exports closure control signal, pass through the 4th voltage sampling port The grid-connected relay unit and the off-network relay unit receive the voltage drive of power grid output；

It controls the 5th I/O port output and disconnects control signal, and control the 6th I/O port output closure control signal, judgement Whether the sampled voltage that the 5th voltage sampling port receives is equal to the first voltage thief hatch and the 4th voltage is adopted The sampled voltage that any one in sample mouth receives；If so, determine on the bypass relay unit fire wire cable two after At least one of electric appliance, which exists, glues dead failure；Otherwise, it is determined that two relays on the bypass relay unit fire wire cable There is no glue dead failure；

The 5th I/O port output closure control signal is controlled, and controls the 6th I/O port output and disconnects control signal, judgement Whether the sampled voltage that the 5th voltage sampling port receives is equal to the first voltage thief hatch and the 4th voltage is adopted The sampled voltage that any one in sample mouth receives；If so, determine on the bypass relay unit zero curve cable two after At least one of electric appliance, which exists, glues dead failure；Otherwise, it is determined that two relays on the bypass relay unit zero curve cable There is no glue dead failure.

9. the controller of energy storage inverter according to claim 4, which is characterized in that control the third I/O port and described 4th I/O port output closure control signal, and only one has in the 6th voltage sampling port and the 4th voltage sampling port In the case where voltage drive, the sampled voltage received according to the 6th voltage sampling port and the 4th voltage sampling port, Judge that the relay in the off-network relay unit whether there is and be not closed failure, comprising:

Judge whether the sampled voltage that the 4th voltage sampling port receives is equal to what the 6th voltage sampling port received Sampled voltage；

If so, determining that there is no be not closed failure for relay in the off-network relay unit；Otherwise determine the off-network Relay in relay unit, which exists, is not closed failure.

10. the controller of energy storage inverter according to claim 4, which is characterized in that control the third I/O port and institute It states the 4th I/O port and exports different control signals, and have electricity in the 6th voltage sampling port and the 4th voltage sampling port In the case where pressure excitation, according to any one in the 4th voltage sampling port and the 6th voltage sampling port and the third The sampled voltage that voltage sampling port receives, judge relay in the off-network relay unit with the presence or absence of gluing dead failure, Include:

It controls the 5th I/O port and the 6th IO exports closure control signal, the 4th voltage sampling port is made to pass through institute State the voltage drive that bypass relay unit receives power grid output；

It controls the third I/O port output and disconnects control signal, and control the 4th I/O port output closure control signal, judgement Whether the sampled voltage that the tertiary voltage thief hatch receives is equal to the sampled voltage that the first voltage thief hatch receives； If so, determining that dead failure is glued in the presence of at least one of two relays on the off-network relay unit fire wire cable；It is no Then, determine on the off-network relay unit fire wire cable that two relays are not present and glue dead failure；

The third I/O port output closure control signal is controlled, and controls the 4th I/O port output and disconnects control signal, judgement Whether the sampled voltage that the tertiary voltage thief hatch receives is equal to the sampled voltage that the first voltage thief hatch receives； If so, determining that dead failure is glued in the presence of at least one of two relays on the off-network relay unit zero curve cable；It is no Then, determine on the off-network relay unit zero curve cable that two relays are not present and glue dead failure.

11. the controller of -10 any energy storage inverters according to claim 1, which is characterized in that the processor is also used In:

The relay in any one relay unit is being judged there are when failure, and the warning device of Xiang Suoshu energy storage inverter is sent out Preset alarm signal is sent, so that user learns that relay failure failure occurs in the energy storage inverter.

12. a kind of energy storage inverter characterized by comprising

Inverter circuit；

It is set to the grid-connected relay unit, bypass relay unit and off-network relay unit of inverter circuit exchange side； And

The controller of energy storage inverter as described in any one of claim 1 to 11；

The grid-connected relay unit be set to inverter circuit exchange side and the energy storage inverter and between network interface, institute It states off-network relay unit to be set between the inverter circuit exchange side and the off-network mouth of the energy storage inverter, the bypass Described in relay unit is set to and between network interface and the off-network mouth.