CN104734177B - Grid-connected connection equipment and its control method and grid-connected electric power system - Google Patents
Grid-connected connection equipment and its control method and grid-connected electric power system Download PDFInfo
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- CN104734177B CN104734177B CN201310724410.6A CN201310724410A CN104734177B CN 104734177 B CN104734177 B CN 104734177B CN 201310724410 A CN201310724410 A CN 201310724410A CN 104734177 B CN104734177 B CN 104734177B
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- H02J3/385—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of grid-connected connection equipment and its control method and grid-connected electric power system.The equipment includes：Bi-directional inverter, is connected between grid-connected connection end and electrical network connection end, and grid-connected connection end is used to connect DC generation equipment, the DC terminal of correspondence bi-directional inverter, and electrical network connection end is used to connect AC network, the exchange end of correspondence bi-directional inverter；Inverter, is connected between grid-connected connection end and load connection end, and load connection end is used to connect AC load, the exchange end of correspondence inverter；MPPT controller, the input end of MPPT controller be used for connect setting respectively grid-connected connection end the first testing equipment, be arranged on the second testing equipment of electrical network connection end and be arranged on the 3rd testing equipment of load connection end, the output end connection bi-directional inverter and inverter of MPPT controller.The present invention solves the problems, such as that the MPPT designs of existing photovoltaic generating system are not particularly suited for the grid-connected electric power system of hair electricity one.
Description
Technical field
The present invention relates to field of power transmission, in particular to a kind of grid-connected connection equipment and its control method and simultaneously
Net electric power system.
Background technology
Solar energy gets more and more people's extensive concerning as a kind of energy of clean environment firendly, and over nearly more than 20 years, solar energy is wide
It is general to be applied to each occasion.Solar energy power generating is a kind of important form of Solar use, is by light using photovoltaic module
The forms of electricity generation of electric energy can be converted to, and with the continuous progress of technology, photovoltaic generation is probably most promising
One of generation technology.
In photovoltaic generating system, the utilization rate of photovoltaic module has outside the Pass except the bulk properties with photovoltaic cell, also receives
Use environment such as irradiance, load and the impact of the factor such as stable.Under different external condition, photovoltaic module may operate in
On different and unique maximum power point.Therefore, maximum power point tracking technology MPPT（Maxiumum Power Point
Tracking）It is the important technology that luminous energy is converted into electric energy to greatest extent.
Current photovoltaic generating system is mainly by carrying out between the output of photovoltaic module and the current/voltage of electrical network
Loop design completes MPPT controls, to realize net synchronization capability index of luminous energy electric energy and electrical network etc..Understand accordingly, current photovoltaic
Electricity generation system Main Function is to generate electricity, and its purpose mainly converts light energy into the electric energy with synchronized to greatest extent, its
It is network system that load can be approximately considered；Backend load electricity consumption is then after solar energy converting electrical energy imports electrical network, by electrical network
United Dispatching.Therefore, the key of MPPT controls need to only ensure that photovoltaic electric energy is synchronous with electrical network.
In the photovoltaic system of hair electricity one, load can not be approximately merely electrical network, need to count backend load and examine
Amount is directly controlled, and its mode of operation is also no longer pure power generation mode, wherein, photovoltaic system needs in each mode
Switched in real time, however maintain the existing state modulators of MPPT result do not ensure that the stable of intermediate dc bus voltage and
The control targe of power factor sine-wave current, that is to say, that the MPPT designs of existing photovoltaic generating system are not particularly suited for
The grid-connected electric power system of hair electricity one.For this problem, effective solution is not yet proposed at present.
The content of the invention
A kind of grid-connected connection equipment and its control method and grid-connected electric power system are embodiments provided, at least to solve
The MPPT designs of certainly existing photovoltaic generating system are not particularly suited for the technical problem of the grid-connected electric power system of hair electricity one.
A kind of one side according to embodiments of the present invention, there is provided grid-connected connection equipment, including：Bi-directional inverter, even
It is connected between grid-connected connection end and electrical network connection end, wherein, above-mentioned grid-connected connection end is used to connect DC generation equipment, in correspondence
The DC terminal of bi-directional inverter is stated, above-mentioned electrical network connection end is used to connect AC network, the exchange of the above-mentioned bi-directional inverter of correspondence
End；Inverter, is connected between above-mentioned grid-connected connection end and load connection end, wherein, above-mentioned load connection end is used to connect hands over
Current load, the exchange end of the above-mentioned inverter of correspondence；MPPT controller, the input end of above-mentioned MPPT controller are used to connect respectively
The first testing equipment for being arranged on above-mentioned grid-connected connection end, the second testing equipment for being arranged on above-mentioned electrical network connection end, Yi Jishe
Put the 3rd testing equipment in above-mentioned load connection end, the output end of above-mentioned MPPT controller connect above-mentioned bi-directional inverter with
Above-mentioned inverter, for being set according to above-mentioned first testing equipment, and/or above-mentioned second testing equipment, and/or above-mentioned 3rd detection
The standby electrical parameter detected by corresponding test point controls above-mentioned bi-directional inverter and/or above-mentioned inverter, wherein, it is above-mentioned
Electrical parameter includes at least one of：Voltage, electric current, power.
Preferably, above-mentioned grid-connected connection equipment also includes：Switching device, is connected to above-mentioned electrical network connection end, above-mentioned load
Between connection end and above-mentioned grid-connected connection end；Wherein, when above-mentioned switching device is in first state, above-mentioned grid-connected connection end is broken
The connection with above-mentioned electrical network connection end and above-mentioned load connection end is opened, above-mentioned MPPT controller switches to idle mode；And/or,
When above-mentioned switching device is in the second state, above-mentioned load connection end is disconnected and being connected with above-mentioned grid-connected connection end and above-mentioned electrical network
The connection at end is connect, above-mentioned MPPT controller switches to power generation mode, for according to above-mentioned first testing equipment and above-mentioned second inspection
The above-mentioned electrical parameter that measurement equipment is detected controls above-mentioned bi-directional inverter；And/or, the third state is in above-mentioned switching device
When, above-mentioned electrical network connection end disconnects the connection with above-mentioned grid-connected connection end and above-mentioned load connection end, above-mentioned MPPT controller
Load model is switched to, for the above-mentioned electrical parameter detected according to above-mentioned first testing equipment and above-mentioned 3rd testing equipment
Control above-mentioned inverter；And/or, when above-mentioned switching device is in four states, above-mentioned grid-connected connection end is by above-mentioned two-way
Inverter connects above-mentioned electrical network connection end and connects above-mentioned load connection end by above-mentioned inverter, and above-mentioned MPPT controller is cut
Shift to load power generation mode or load power mode, wherein, under above-mentioned load power generation mode, above-mentioned MPPT controller is used for
According to the above-mentioned electrical parameter control exported by above-mentioned first testing equipment, above-mentioned second testing equipment and above-mentioned 3rd testing equipment
Above-mentioned bi-directional inverter and/or above-mentioned inverter are made, and/or, under above-mentioned load power mode, above-mentioned MPPT controller is used for
Above-mentioned bi-directional inverter is controlled according to the above-mentioned electrical parameter that above-mentioned first testing equipment and above-mentioned 3rd testing equipment are detected
And/or above-mentioned inverter.
Preferably, above-mentioned switching device includes at least one of：First switch device, is connected to above-mentioned grid-connected connection end
Between dc bus, above-mentioned dc bus is the transmission line between above-mentioned bi-directional inverter and above-mentioned inverter；Second switch
Device, is connected between above-mentioned grid-connected connection end and above-mentioned electrical network connection end, and above-mentioned second switch device be arranged on it is above-mentioned straight
On stream bus；3rd switching device, is connected between above-mentioned grid-connected connection end and above-mentioned load connection end, and above-mentioned 3rd switch
Device is arranged on above-mentioned dc bus.
Preferably, above-mentioned grid-connected connection equipment also includes at least one of：4th switching device, one end connection are above-mentioned defeated
Enter end, the other end is used to connect above-mentioned first testing equipment；5th switching device, one end connect above-mentioned input end, another
Hold for connecting above-mentioned second testing equipment；6th switching device, one end connect above-mentioned input end, and the other end is used for connection
State the 3rd testing equipment.
Preferably, above-mentioned grid-connected connection equipment also includes：Mode controller, connects above-mentioned switching device and above-mentioned MPPT controls
Device processed, above-mentioned mode controller switch between the state of at least one of for controlling above-mentioned switching device：Above-mentioned first
State, above-mentioned second state, the above-mentioned third state, above-mentioned 4th state, and control above-mentioned MPPT controller switch to it is above-mentioned
The corresponding pattern of state of switching device.
Preferably, above-mentioned grid-connected connection equipment also includes at least one of：Above-mentioned first testing equipment, above-mentioned second inspection
Measurement equipment, above-mentioned 3rd testing equipment.
Preferably, above-mentioned grid-connected connection equipment also includes：The 4th testing equipment being arranged on dc bus, connects above-mentioned
Input end, wherein, above-mentioned dc bus is the transmission line between above-mentioned bi-directional inverter and above-mentioned inverter, above-mentioned MPPT controls
Device processed for the voltage according to detected by above-mentioned electrical parameter and above-mentioned 4th testing equipment are in corresponding test point and/or
The above-mentioned bi-directional inverter of current control and/or above-mentioned inverter.
Preferably, above-mentioned MPPT controller controls above-mentioned bi-directional inverter and/or above-mentioned inverse by the signal of one below
Become device：Voltage signal, current signal, pulse-width signal.
Preferably, above-mentioned DC generation equipment is photovoltaic power generation equipment；And/or, be connected to above-mentioned electrical network connection end with it is upper
It is three-phase power transmission line or Monophase electric power transmission line to state the transmission line between bi-directional inverter；And/or, it is connected to above-mentioned negative
It is three-phase power transmission line or Monophase electric power transmission line to carry the transmission line between connection end and above-mentioned inverter.
Another aspect according to embodiments of the present invention, additionally provides a kind of control method of grid-connected connection equipment, including：Sentence
Above-mentioned grid-connected connection end in disconnected above-mentioned grid-connected connection equipment, between above-mentioned electrical network connection end and above-mentioned load connection end
Connection status；Above-mentioned MPPT controller is switched to into control model corresponding with above-mentioned connection status.
Preferably, it is above-mentioned by above-mentioned MPPT controller switch to control model corresponding with above-mentioned connection status include it is following
At least one：When above-mentioned grid-connected connection end disconnects the connection with above-mentioned electrical network connection end and above-mentioned load connection end, will be above-mentioned
MPPT controller switches to idle mode；Disconnect in above-mentioned load connection end and being connected with above-mentioned grid-connected connection end and above-mentioned electrical network
During the connection at end, above-mentioned MPPT controller is switched to into power generation mode, wherein, under above-mentioned power generation mode, above-mentioned MPPT controls
Device is above-mentioned two-way for the above-mentioned electrical parameter control detected according to above-mentioned first testing equipment and above-mentioned second testing equipment
Inverter；When above-mentioned electrical network connection end disconnects the connection with above-mentioned grid-connected connection end and above-mentioned load connection end, will be above-mentioned
MPPT controller switches to load model, wherein, under above-mentioned power generation mode, for according to above-mentioned first testing equipment and above-mentioned
The above-mentioned electrical parameter that 3rd testing equipment is detected controls above-mentioned inverter；Two-way changed by above-mentioned in above-mentioned grid-connected connection end
When stream device connects above-mentioned electrical network connection end and connects above-mentioned load connection end by above-mentioned inverter, by above-mentioned MPPT controller
Load power generation mode or load power mode are switched to, wherein, under above-mentioned load power generation mode, above-mentioned MPPT controller is used
In the above-mentioned electrical parameter exported according to above-mentioned first testing equipment, above-mentioned second testing equipment and above-mentioned 3rd testing equipment
Above-mentioned bi-directional inverter and/or above-mentioned inverter are controlled, under above-mentioned load power mode, above-mentioned MPPT controller is used for basis
The above-mentioned electrical parameter that above-mentioned first testing equipment and above-mentioned 3rd testing equipment are detected control above-mentioned bi-directional inverter and/or
Above-mentioned inverter.
Another aspect according to embodiments of the present invention, additionally provides a kind of grid-connected electric power system, including：Above-mentioned grid-connected company
Connect equipment；DC generation equipment, connects the grid-connected connection end of above-mentioned grid-connected connection equipment；One or more AC loads, connection
The load connection end of above-mentioned grid-connected connection equipment.
First, in embodiments of the present invention, it is proposed that a kind of new framework of the electric power system of hair electricity one, it is applied to
The grid-connected connection equipment of the framework can include the bi-directional inverter being connected in turn between electrical network connection end and load connection end
And inverter and by the grid-connected connection end drawn between bi-directional inverter and inverter, wherein, electrical network connection end can connect
Electrical network, load connection end can connect load, grid-connected connection end and can connect DC generation equipment, so as to the DC generation equipment
Electric energy can be conveyed in a lateral electrical network, electric energy be conveyed in another lateral AC load, which forms a hair electricity one
System, and as DC generation equipment directly to AC load energy regenerative, therefore can improve the electric energy produced by which
Straight drive utilization rate.
Further, in embodiments of the present invention, the input end of MPPT controller can be separately positioned on grid-connected company
End, the first testing equipment of electrical network connection end and load connection end, the second testing equipment and the connection of the 3rd testing equipment are connect,
To obtain the electrical parameters such as the voltage fed back in corresponding test point, electric current, power, so as to the MPPT controller can be with
According to the output of one or more in these testing equipments, namely respectively in DC generation equipment side, AC network side
And one or more realizations in the electrical parameter that gathered of AC load side have to bi-directional inverter and/or adverse current device
Effect control, and then more excellent power supplying efficiency is reached, so as to the MPPT for solving existing photovoltaic generating system is designed and is not applied to
In the technical problem of the grid-connected electric power system of hair electricity one.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of a kind of optional grid-connected connection equipment according to embodiments of the present invention；
Fig. 2 is a kind of schematic diagram of the MPPT control programs according to prior art；
Fig. 3 is the schematic diagram of the optional grid-connected connection equipment of another kind according to embodiments of the present invention；
Fig. 4 is the schematic diagram of the control method of a kind of optional grid-connected connection equipment according to embodiments of the present invention.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing the present invention in detail.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Embodiment 1
According to embodiments of the present invention, there is provided a kind of grid-connected connection equipment, as shown in figure 1, the equipment includes：
1）Bi-directional inverter 102, is connected between grid-connected connection end 104 and electrical network connection end 106, wherein, grid-connected connection
End 104 is used to connect DC generation equipment, and the DC terminal of correspondence bi-directional inverter 102, electrical network connection end 106 are used to connect exchange
Electrical network, the exchange end of correspondence bi-directional inverter 102；
2）Inverter 108, is connected between grid-connected connection end 104 and load connection end 110, wherein, load connection end 110
For connecting AC load, the exchange end of correspondence inverter 108；
3）MPPT controller 112, the input end of MPPT controller 112 are used for difference connect setting in grid-connected connection end
104 the first testing equipment 114, the second testing equipment 116 for being arranged on electrical network connection end 106, and be arranged on load connection
3rd testing equipment 118 at end 110, output end connection bi-directional inverter 102 and the inverter 108 of MPPT controller 112, uses
According to the first testing equipment 114, and/or the second testing equipment 116, and/or the 3rd testing equipment 118 in corresponding test point
Detected electrical parameter control bi-directional inverter 102 and/or inverter 108, wherein, electrical parameter include it is following at least it
One：Voltage, electric current, power.
It will be clear that one of technical solution of the present invention problem to be solved is to provide a kind of equipment, it is straight to realize
Generating equipment is flowed to the grid-connected of electrical network, that is, can more efficiently import the electric energy provided by the DC generation equipment
In network system, and enable electrical network effectively to dispatch these electric energy, and then improve the power supply capacity of electrical network.
To solve the above problems, the grid-connected connection equipment for providing according to embodiments of the present invention can pass through its grid-connected connection
End 104 connecting DC generation equipment, and by its electrical network connection end 106 connecting AC network, wherein, be different from existing skill
The inverter 108 being connected between DC generation equipment and AC network generally adopted in art, in embodiments of the present invention,
Bi-directional inverter 102 can be connected between grid-connected connection end 104 and electrical network connection end 106, it is two-way such that it is able to pass through this
Inverter 102 realizes supply of the electric energy to electrical network, specifically, can show as the lifting of output power, wherein, this replacement side
Case is played a part of to elaborate in embodiment afterwards.
Further, to make the AC energy and AC network provided by bi-directional inverter 102 by DC generation equipment
Electric energy reach synchronization, and make DC generation equipment reach more excellent output point, in some embodiments of the invention, can
Realize to DC generation equipment to alternating current with by the way of being controlled to bi-directional inverter 102 using MPPT controller 112
The modulation of the electric energy of net feedback, and then realize the lifting to grid connection efficiency.
In embodiments of the present invention, the |input paramete of MPPT controller 112 is can be from above-mentioned first testing equipment
114 and second testing equipment 116 output, wherein, the output of the first testing equipment 114 can be first testing equipment 114
In the electrical parameter that the vicinity of its test point namely grid-connected connection end 104 is detected, the output of the second testing equipment 116 can
To be second testing equipment 116 in the detected electrical parameter in the vicinity of its test point namely electrical network connection end 106, its
In, the electrical parameter can be voltage, or electric current, can also be power that testing equipment is drawn on this basis etc. with
The parameter of the electric energy correlation transmitted via grid-connected connection end 104 and/or electrical network connection end 106, accordingly, first detection sets
Standby 114 and second testing equipment 116 can include voltage sensor and/or current sensor etc., wherein, specifically, by these
The concrete manifestation form of the electrical parameter of testing equipment feedback can be the signal of telecommunication of these testing equipments output, and then MPPT controls
Device processed 112 can realize the collection to these electrical parameters by the input end being connected with these testing equipments.More specifically,
In embodiments of the present invention, the input end of MPPT controller 112 can be the terminal block at least including three connection ends, its
In, these three connection ends can connect the first testing equipment 114, the second testing equipment 116 and the 3rd testing equipment 118 respectively,
3rd testing equipment 118 is arranged on load connection end 110, its specific working method and the first testing equipment 114 and second
Testing equipment 116 is similar to, and here of the present invention does not make tired stating.
It should be noted that concrete connection of the present invention to the internal structure of above three testing equipment and its in the line
Mode is not limited in any way, and for example, in embodiments of the present invention, the current sensor in these testing equipments can be connected on
Electromagnetic current transducer, or Hall element etc. in detection circuit, wherein, these testing equipments are implemented
Mode can't be impacted to the enforcement of technical solution of the present invention and its realization of technique effect, also should not be construed as to this
Bright restriction.
Similarly, in embodiments of the present invention, the specific implementation of MPPT controller 112 can also be using similar to existing
Having is used for the circuit or device of realizing above-mentioned control function present in technology, for example, a kind of to be typically used for what MPPT was controlled
Three close-loop control structure can be so that as shown in Fig. 2 wherein, the |input paramete of the MPPT controller 112 can be in DC generation equipment
Voltage and current and the voltage gathered in AC network side and/or electric current as synchronizing signal that side is gathered,
Its output parameter could be for the pulse-width signal for controlling DC/DC transducers and DC/AC transducers in inverter 202,
So as to the MPPT according to synchronous situation to pulse-width signal, such as its dutycycle is adjusted, and then can be realized to inversion
The regulation of the exchange output produced by device 202.Certainly, it is more than a kind of example, the present invention is not construed as limiting to this, for example,
In some embodiments of the present invention, the output of MPPT controller 112 can also be not limited to the form of pulse, such as can be by electricity
Press the analogue signal such as signal or current signal to realize the control of the output to the inverter 202 being connected with DC generation equipment,
That is, in embodiments of the present invention, MPPT controller 112 controls bi-directional inverter 102 and/or inverse by the signal of one below
Become device 108：Voltage signal, current signal, pulse-width signal.Additionally, the tracking of the MPPT controller 112 to maximum power point
Can be combined with the control logic of writing controller chip to realize, such as by the amplitude of output voltage and/or electric current and/or
The dynamic tracking to maximum power point is realized in the scanning of phase place, etc..It should be appreciated that the above-mentioned embodiment of the present invention all should
It is considered as within protection scope of the present invention.
By the technical scheme described in above-described embodiment, it is possible to achieve DC generation equipment to AC network it is effective simultaneously
Net, wherein, the framework provided by such scheme similarly to the prior art may be summarized to be DC generation equipment to AC network
Power, and then the AC network after dilatation goes to connect each AC load again.In traditional electricity generation system, this framework can reach
To ideal power supplying efficiency, but in the system of hair electricity one, as the load of DC generation equipment can not be single
Electrical network is approximately purely, in addition it is also necessary to consider impact of the backend load to its power supplying efficiency, this allows for traditional MPPT design nothings
Method satisfaction control effectively more excellent to reach in the system of the increasingly complex hair electricity one of influence factor to inverter
The design requirement of power supplying efficiency.
For this problem, in embodiments of the present invention, a kind of new framework is first proposed, it is specifically, above-mentioned grid-connected
Connection equipment is also provided with loading connection end 110, and the load connection end 110 is used to connect AC load, wherein, above-mentioned
Inverter 108 can be connected between grid-connected connection end 104 and load connection end 110, so as to DC generation equipment can be one
Lateral electrical network conveying electric energy, conveys electric energy in another lateral AC load, the system which forms a hair electricity one, and
And as DC generation equipment directly to AC load energy regenerative, therefore can improve the straight drive of electric energy produced by which and utilize
Rate.Further, in embodiments of the present invention, the input end of MPPT controller 112 can be arranged on the load and be connected
3rd testing equipment 118 at end 110 connects, to gather the electricity such as the aforesaid voltage fed back load connection end 110, electric current, power
Parameter, so as to the MPPT controller 112 can be according to the output of one or more in these testing equipments, namely respectively straight
One or more realizations in the electrical parameter gathered by stream generating equipment side, AC network side and AC load side
To bi-directional inverter 102 and/or the effective control of adverse current device, and then reach more excellent power supplying efficiency.
On the basis of above description, it is the more efficiently control for further realizing the system to hair electricity one,
Switching device is also provided with the above-mentioned grid-connected connection equipment for providing according to embodiments of the present invention, and then can be cut by this
Changing device realizes switching of the system of hair electricity one between different application models, to reach the appearance in DC generation equipment
Amount, the purpose being flexibly matched between the capacity of AC network and the capacity of AC load.On the other hand, MPPT controls
Device 112 can also coordinate switching device to perform control strategy corresponding with application model, such that it is able to reach more excellent power supply effect
Rate.Specifically, in embodiments of the present invention, above-mentioned grid-connected connection equipment can include：
1）Switching device, is connected between electrical network connection end 106, load connection end 110 and grid-connected connection end 104；
Wherein,
When switching device is in first state, grid-connected connection end 104 disconnects and electrical network connection end 106 and load connection end
110 connection, MPPT controller 112 switch to idle mode；And/or,
When switching device is in the second state, load connection end 110 is disconnected and being connected with grid-connected connection end 104 and electrical network
The connection at end 106, MPPT controller 112 switches to power generation mode, for according to the first testing equipment 114 and the second testing equipment
The 116 electrical parameter control bi-directional inverters 102 for detecting；And/or,
When switching device is in the third state, electrical network connection end 106 is disconnected and being connected with grid-connected connection end 104 and load
The connection at end 110, MPPT controller 112 switches to load model, for according to the first testing equipment 114 and the 3rd testing equipment
The 118 electrical parameter control inverters 108 for detecting；And/or,
When switching device is in four states, grid-connected connection end 104 connects electrical network connection end by bi-directional inverter 102
106th, and by the connection load of inverter 108 connection end 110, MPPT controller 112 switches to load power generation mode or load
With power mode, wherein,
Under load power generation mode, MPPT controller 112 is for according to the first testing equipment 114, the second testing equipment 116
Bi-directional inverter 102 and/or inverter 108 are controlled with the electrical parameter exported by the 3rd testing equipment 118, and/or, in load
With under power mode, MPPT controller 112 is for the electricity that detected according to the first testing equipment 114 and the 3rd testing equipment 118
State modulator bi-directional inverter 102 and/or inverter 108.
In embodiments of the present invention, when switching device is in first state, electrical network connection end 106 and load connection end
110 pass through bi-directional inverter 102 and inverter 108 connects, wherein, electric energy can first pass through the bi-directional inverter 102 by exchanging
Direct current is converted to, and then direct current is converted to by exchange by inverter 108, it is to supply AC load, under this scene, two-way
Inverter 102 works as commutator.Wherein, grid-connected connection end 104 is broken with electrical network connection end 106 and load connection end 110
Open, AC network bears the power supply to AC load completely, DC generation equipment does not export electric energy, therefore only needs to consider exchange
Matching between load characteristic and AC network, and power supplying efficiency of the MPPT controller 112 to DC generation equipment need not be played
Adjustment effect, MPPT controller 112 can be operated in holding state Light Condition in other words.
When switching device is in the second state, grid-connected connection end 104 connects electrical network connection end by bi-directional inverter 102
106, wherein, electric energy can be converted to exchange by direct current by the bi-directional inverter 102, to realize DC generation equipment to exchange
The energy regenerative of electrical network, under this scene, bi-directional inverter 102 works as inverter 108.Wherein, load connection end 110 with simultaneously
Net connection end 104 and electrical network connection end 106 disconnect, and AC load not electricity consumption, the electric energy produced by DC generation equipment are complete
AC network is imported, therefore only needs to consider the maximization of DC generation equipment and the synchronous and power supplying efficiency of AC network, from
And MPPT controller 112 can be operated in traditional mode power generation mode in other words, wherein, the control parameter of MPPT is DC generation
The output parameter and synchronized parameter of equipment, namely the output of the first testing equipment 114 and the second testing equipment 116.
When switching device is in the second state, grid-connected connection end 104 connects electrical network connection end 106 by inverter 108,
Wherein, electric energy can be converted to exchange by direct current by the inverter 108, to realize confession of the DC generation equipment to AC load
Electricity.Wherein, electrical network connection end 106 is disconnected with grid-connected connection end 104 and load connection end 110, and AC network is neither from direct current
Generating equipment imports electric energy, does not also power to AC load, and the electric energy produced by DC generation equipment is entirely used for driving exchange
Load, therefore only need to consider matching for DC generation equipment and AC load, so as to MPPT controller 112 can be operated in load
Pattern, wherein, the control parameter of MPPT output parameter and load-related parameter for DC generation equipment, namely the first detection
The output of equipment 114 and the 3rd testing equipment 118.
When switching device is in four states, grid-connected connection end 104 connects electrical network connection end by bi-directional inverter 102
106th, and by the connection load of inverter 108 connection end 110, this annexation correspond to two kinds of the system of hair electricity one
Application model：1）Load power mode, the capacity of the capacity of DC power generation system less than AC load, AC network be also required to
AC load is powered, and bi-directional inverter 102 works as commutator；2）Load power generation mode, the capacity of DC power generation system are big
In the capacity of AC load, the electric energy produced by the DC power generation system can be converged with part supply AC load, another part
Enter to AC network, bi-directional inverter 102 works as inverter 108.Accordingly, the mode of operation of MPPT controller 112
Can be corresponding with above two pattern：1）Under load power mode, as DC generation equipment is not to AC network energy regenerative, because
The output parameter of this DC generation equipment need not be synchronous with AC network, but still need to guarantee DC generation equipment and exchange negative
The matching of load, wherein, the control parameter of MPPT can be output and the load-related parameter of DC generation equipment, namely first
The output of testing equipment 114 and the 3rd testing equipment 118；2）Under load power generation mode, as DC generation equipment is in supply
Also need to while AC load to AC network energy regenerative, thus MPPT control target not only need the DC generation equipment with
The matching of AC network, matching for the DC generation equipment and AC load is also needed to, so as to the control parameter of MPPT can be wrapped
Include the relevant parameter of the output of DC generation equipment, the relevant parameter of AC network and AC load, namely first to the 3rd
The output of testing equipment.
By the switching device in above-mentioned grid-connected connection equipment, can cause the system of hair electricity one be operated in one or
Under multiple patterns.More specifically, in embodiments of the present invention, above-mentioned switching device can have various implementations, for example, most base
Locally, the switching device can be realized by switching device, such as shown in Fig. 3, the switching device can include it is following at least
One of：
1）First switch device 302, is connected between grid-connected connection end 104 and dc bus, and dc bus is changed for two-way
Transmission line between stream device 102 and inverter 108；
2）Second switch device 304, is connected between grid-connected connection end 104 and electrical network connection end 106, and second switch device
Part 304 is arranged on dc bus；
3）3rd switching device 306, is connected between grid-connected connection end 104 and load connection end 110, and the 3rd derailing switch
Part 306 is arranged on dc bus.
Wherein, first switch device 302, second switch device 304 and the 3rd switching device 306 correspond respectively to it is above-mentioned simultaneously
Grid-connected connection end 104, electrical network connection end 106 and load connection end 110 in net connection equipment, so as in first switch device
During 302 disconnection, grid-connected connection end 104 disconnects, and switching device just can switch to above-mentioned first state, in second switch device
When part 304 disconnects, electrical network connection end 106 disconnects, and switching device just can switch to the third state, in the 3rd switching device
During 306 disconnection, load connection end 110 disconnects, and switching device just can switch to the second state.More specifically, these are opened
It can be both the semiconductor switch such as the IGBT that driven by push-pull amplifier to close device, it is also possible to included by the big work(of chip controls
Rate switch such as relay, catalyst etc., the present invention are not limited in any way to this.
It should be noted that above-mentioned switching device is realized by one or more in above three switching device not
It is unique embodiment of the invention, also should not be construed as constituting the present invention restriction, for example, in some enforcement of the present invention
In example, above three switching device may be formed as one, substitute such as by a selecting switch or selector, etc..Should
When being understood by, the equivalent or obvious modification of such embodiment of the present invention is regarded as within protection scope of the present invention.
Further, it is the power consumption that reduces the first to the 3rd testing equipment and/or MPPT controller 112, of the invention real
Apply in example, above-mentioned grid-connected connection equipment can also include at least one of：
1）4th switching device, one end connection input end, the other end are used to connect the first testing equipment 114；
2）5th switching device, one end connection input end, the other end are used to connect the second testing equipment 116；
3）6th switching device, one end connection input end, the other end are used to connect the 3rd testing equipment 118.
Wherein, by the 4th to the 6th switch, can be under a certain state and pattern by corresponding testing equipment and MPPT
On the other hand the input end connection of controller 112, this aspect be able to can also pass through to cut off unnecessary letter with energy efficient
Number transmission line to reduce the interference of the signal transmssion line to the electrical parameter needed for transmission, so as to realize to hair electricity one being
The further optimization of system.
Further, in embodiments of the present invention, above-mentioned grid-connected connection equipment can also include：
1）Mode controller, connection switching apparatus and MPPT controller 112, mode controller exist for controlling switching device
Switch between the state of at least one of：First state, the second state, the third state, the 4th state, and control MPPT controls
Device 112 switches to pattern corresponding with the state of switching device.
In general, in embodiments of the present invention, mode controller can adopt control loop setting with reference to power component
Meter, but the present invention is not construed as limiting to this, wherein, the mode controller both can be each independent with MPPT controller 112, also may be used
To form as one, such as can occur as an integrated manipulator, wherein, the integrated manipulator can also include two-stage control
Loop processed.Specifically, for previous embodiment, mode controller can be controlled to the first to the 3rd switching device,
Further, the mode controller can also control the 4th to the 6th switch in the lump, and this depends on the specific embodiment party of the present invention
Requirement in formula to control integrated level, the present invention are not construed as limiting to this.Additionally, in embodiments of the present invention, above-mentioned grid-connected connection
Equipment can also be including one or more in the first to the 3rd testing equipment, and this is depended in specific embodiment of the present invention
Requirement to the integrated level of the product of the grid-connected connection equipment, the present invention are not construed as limiting to this.
It is on the basis of above description, further double in view of being connected in the framework for providing according to embodiments of the present invention
DC link between inverter 102 and inverter 108, plays institute on the dc bus of shunting or effect of confluxing in other words
The stable electric power of transmission requires that in embodiments of the present invention, above-mentioned grid-connected connection equipment can also include：
1）The 4th testing equipment being arranged on dc bus, connects the input end of MPPT controller 112, wherein, directly
Stream bus is transmission line between bi-directional inverter 102 and inverter 108, MPPT controller 112 for according to electrical parameter with
And the 4th testing equipment in the voltage detected by corresponding test point and/or current control bi-directional inverter 102 and/or inversion
Device 108.
In embodiments of the present invention, control as the electrical parameter on the dc bus of MPPT control targes and the MPPT
Other aforementioned |input parametes of device 112 can be simultaneously from one or more in first to fourth testing equipment, and which is controlled
Object processed can be still bi-directional inverter 102 and/or inverter 108, wherein, specific control strategy can generally adopt shape
The control mode of state space, but the present invention is not construed as limiting to this.
By above-described embodiment, technical solution of the present invention and its operation principle are set forth, however it is noticeable
It is that above-described embodiment is only used for the understanding to technical solution of the present invention, any unnecessary restriction can't be constituted to the present invention,
For example, Fig. 3 gives a kind of feasible annexation of the first to the 3rd switching device, but in other enforcements of the present invention
In example, second switch device 304 and the 3rd switching device 306 can also be separately positioned on input/output port with inverter 108
Outside, etc..
Explanation is needed further exist for, alleged above-mentioned grid-connected connection end 104, electrical network connection end in the embodiment of the present invention
106 and load connection end 110 should be understood to be respectively used to connect DC generation equipment, AC network and AC load
Interface, any one in these connection ends are not limited to only correspond to a connecting line, wherein, the grid-connected connection end 104 is usual
Could be for connecting a pair of connection ends of a pair of DC links, the electrical network connection end 106 and load connection end 110 can be with
It is that, for connecting three or four connection ends of one group of threephase cable etc., the present invention is not construed as limiting to this.Accordingly, Fig. 1 and Fig. 3
In connecting line only as the annexation between each device one kind illustrate, be not meant to the present invention specific embodiment party
In formula, the corresponding transmission line of these connecting lines is only limitted to one, specifically, in embodiments of the present invention, is connected to electrical network connection end
Between 106 and bi-directional inverter 102, and be connected to load connection end 110 and inverter 108 between transmission line can be three
Phase power transmission line, and be connected between bi-directional inverter 102 and adverse current device, and be connected to the two with grid-connected connection end 104
Between transmission line can be DC link.Certainly, this is a kind of example, in some embodiments of the invention, connection
Between electrical network connection end 106 and bi-directional inverter 102, and be connected to load connection end 110 and inverter 108 between biography
Defeated line can also be the carrier of other AC power transmissions such as Monophase electric power transmission line, and the present invention is not construed as limiting to this.
It should be noted that, in the embodiment of the present invention, alleged above-mentioned DC generation equipment can produce direct current for expression
The equipment of electric power, wherein, the equipment can be the combination of whole set equipment, or multiple concrete equipment, even distributed
, the present invention is not construed as limiting to this.Additionally, the DC generation equipment both can directly provide direct current power export, such as light
Volt module etc., which can also provide indirectly direct current power output, such as be come from wind-driven generator by what set of cells accumulated
The direct current output that provided of electric energy etc..It should be appreciated that these specific embodiments do not affect technical solution of the present invention
Enforcement and its realization of technique effect, the present invention are not also limited in any way to this.
Embodiment 2
According to embodiments of the present invention, additionally provide a kind of control for grid-connected connection equipment as described in example 1 above
Method, as shown in figure 4, the method includes：
S402：Judge the grid-connected connection end in grid-connected connection equipment, the company between electrical network connection end and load connection end
Connect state；
S404：MPPT controller is switched to into control model corresponding with the connection status.
In embodiments of the present invention, it is such as embodiment 1 employed in grid-connected electric power system of the realization to hair electricity one
Described in grid-connected connection equipment more efficiently control, the control method for providing according to embodiments of the present invention can pass through
Step S402 judges the grid-connected connection end in grid-connected connection equipment, the connection shape between electrical network connection end and load connection end
State, and then MPPT controller can be switched to by control model corresponding with connection status by step S404.By above-mentioned side
Formula, according to the corresponding grid-connected connection end under different application models of grid-connected electric power system, electrical network connection end and can bear
Control strategy is targetedly configured in other words to carry control model of the connection status between connection end to MPPT controller,
Such that it is able to realize control more efficiently to the system, and then reach the mesh of the power supplying efficiency for improving the grid-connected electric power system
's.
It should be noted that in embodiments of the present invention, the judgement to connection status described in step S402, both can be with
It is the detection to connection status itself, it would however also be possible to employ other means are determined to which, for example, in some enforcements of the present invention
In example, can be reached by the control that an integrated manipulator is synchronized to the control model of above-mentioned connection status and MPPT
To the purpose that the control model of MPPT is matched with connection status, it should be appreciated that such to belong to the equivalent of the embodiment of the present invention
Or the equal embodiment replaced is regarded as within protection scope of the present invention.
Specifically, in embodiments of the present invention, above-mentioned control model can have various, can be according to grid-connected connection system
Various connection status between multiple-working mode or grid-connected connection end, electrical network connection end and load connection end are pre- advanced
Row design, wherein, for a certain specific control model of MPPT, which both can be realized by hardware logic, also may be used
Realize with by software logic, the present invention is not construed as limiting to this.Wherein, as the reference of optional control model, at this
In bright embodiment, above-mentioned steps S404 can include the operation of at least one of：
S1：When grid-connected connection end disconnects the connection with electrical network connection end and load connection end, MPPT controller is switched
For idle mode；
S2：When load connection end disconnects the connection with grid-connected connection end and electrical network connection end, MPPT controller is cut
Power generation mode is shifted to, wherein, in generate mode, MPPT controller is for according to the first testing equipment and the inspection of the second testing equipment
The electrical parameter control bi-directional inverter for measuring；
S3：When electrical network connection end disconnects the connection with grid-connected connection end and load connection end, MPPT controller is cut
Load model is shifted to, wherein, in generate mode, for the electricity detected according to the first testing equipment and the 3rd testing equipment
State modulator inverter；
S4：Electrical network connection end is connected and by inverter connection load connection by bi-directional inverter in grid-connected connection end
During end, MPPT controller is switched to into load power generation mode or load power mode, wherein, under load power generation mode,
MPPT controller is controlled for the electrical parameter exported according to the first testing equipment, the second testing equipment and the 3rd testing equipment
Bi-directional inverter and/or inverter, under load power mode, MPPT controller is for according to the first testing equipment and the 3rd inspection
Electrical parameter control bi-directional inverter and/or inverter that measurement equipment is detected.
In embodiments of the present invention, grid-connected electric power system can be realized by switching device as described in example 1 above
Switching between different application models, to reach in the capacity of photovoltaic power generation equipment, the capacity of AC network and exchange
The purpose being flexibly matched between the capacity of load, wherein, the switching device can be connected to AC network, AC load with
Between photovoltaic power generation equipment, when switching device is in any state in multiple states, AC network, AC load and photovoltaic
Annexation between generating equipment can switch to connection status corresponding with any state.On the other hand, MPPT controls
Device can also coordinate switching device to perform control strategy corresponding with application model, such that it is able to reach more excellent power supplying efficiency,
Its specific operation principle may be referred to the description in embodiment 1, and here of the present invention does not make tired stating.
It should be noted that above-described embodiment is only used for the understanding to technical solution of the present invention, and it is not construed as to this
Bright to constitute restriction, for example, in some embodiments of the invention, above-mentioned control model further can also be segmented, its
In, above-mentioned MPPT controller can be combined with the other factors beyond above-mentioned connection status and switch to corresponding control model, this
Invention is not construed as limiting to this.
Embodiment 3
According to embodiments of the present invention, a kind of grid-connected electric power system is additionally provided, the system includes：
1）Grid-connected connection equipment as described in Example 1；
2）DC generation equipment, connects the grid-connected connection end of grid-connected connection equipment；
3）One or more AC loads, connect the load connection end of grid-connected connection equipment.
In embodiments of the present invention, it is proposed that a kind of new framework of grid-connected electric power system, it is applied to the grid-connected of the framework
Connection equipment can include be connected in turn electrical network connection end and load connection end between bi-directional inverter and inverter and
By the grid-connected connection end drawn between bi-directional inverter and inverter, wherein, electrical network connection end can connect electrical network, load connection
End can connect load, grid-connected connection end and can connect DC generation equipment, so as to the DC generation equipment can be lateral one
Electrical network conveys electric energy, conveys electric energy in another lateral AC load, which forms the grid-connected power supply system of a hair electricity one
System, and as DC generation equipment directly to AC load energy regenerative, therefore can improve the straight of electric energy produced by which
Drive utilization rate.
Further, in embodiments of the present invention, the input end of MPPT controller can be separately positioned on grid-connected company
End, the first testing equipment of electrical network connection end and load connection end, the second testing equipment and the connection of the 3rd testing equipment are connect,
To obtain the electrical parameters such as the voltage fed back in corresponding test point, electric current, power, so as to the MPPT controller can be with
According to the output of one or more in these testing equipments, namely respectively in DC generation equipment side, AC network side
And one or more realizations in the electrical parameter that gathered of AC load side have to bi-directional inverter and/or adverse current device
Effect control, and then more excellent power supplying efficiency is reached, so as to the MPPT for solving existing photovoltaic generating system is designed and is not applied to
In the technical problem of the grid-connected electric power system of hair electricity one.
Additionally, in embodiments of the present invention, it is also possible in conjunction with the embodiments described in 1 to the various of grid-connected connection equipment
Improve, the effect similar with the description in embodiment 1 can be reached using the grid-connected electric power system of the grid-connected connection equipment, this
Bright here does not make tired stating.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of grid-connected connection equipment, it is characterised in that include：
Bi-directional inverter, is connected between grid-connected connection end and electrical network connection end, wherein, the grid-connected connection end is used to connect straight
Stream generating equipment, the DC terminal of the correspondence bi-directional inverter, the electrical network connection end are used to connect AC network, and correspondence is described
The exchange end of bi-directional inverter；
Inverter, is connected between the grid-connected connection end and load connection end, wherein, the load connection end is used to connect hands over
Current load, the exchange end of the correspondence inverter；
MPPT controller, the input end of the MPPT controller are used for difference connect setting the first of the grid-connected connection end
Testing equipment, the second testing equipment for being arranged on the electrical network connection end and it is arranged on the 3rd inspection of the load connection end
Measurement equipment, the output end of the MPPT controller connect the bi-directional inverter and the inverter, for according to described the
One testing equipment, and/or second testing equipment, and/or the 3rd testing equipment are detected by corresponding test point
Electrical parameter control the bi-directional inverter and/or the inverter, wherein, the electrical parameter include it is following at least it
One：Voltage, electric current, power；
Switching device, is connected between the electrical network connection end, the load connection end and the grid-connected connection end；
When the switching device is in first state, the grid-connected connection end disconnects and the electrical network connection end and the load
The connection of connection end, the MPPT controller switch to idle mode；And/or, when the switching device is in the second state,
The load connection end disconnects the connection with the grid-connected connection end and the electrical network connection end, the MPPT controller switching
To power generation mode, for the electrical parameter control detected according to first testing equipment and second testing equipment
The bi-directional inverter；And/or,
When the switching device is in the third state, the electrical network connection end disconnects and the grid-connected connection end and described negative
The connection of connection end is carried, the MPPT controller switches to load model, for according to first testing equipment and described the
The electrical parameter that three testing equipments are detected controls the inverter；And/or,
When the switching device is in four states, the grid-connected connection end connects the electrical network by the bi-directional inverter
Connection end simultaneously connects the load connection end by the inverter, the MPPT controller switch to load power generation mode or
Person loads and uses power mode, wherein, under the load power generation mode, the MPPT controller is set for detecting according to described first
The electrical parameter exported by standby, described second testing equipment and the 3rd testing equipment controls the bi-directional inverter
And/or the inverter, and/or, under the load power mode, the MPPT controller is for according to the described first detection
The electrical parameter that equipment and the 3rd testing equipment are detected controls the bi-directional inverter and/or the inverter.
2. grid-connected connection equipment according to claim 1, it is characterised in that the switching device include it is following at least it
One：
First switch device, is connected between the grid-connected connection end and dc bus, and the dc bus two-way is changed for described
Transmission line between stream device and the inverter；
Second switch device, is connected between the grid-connected connection end and the electrical network connection end, and the second switch device
It is arranged on the dc bus；
3rd switching device, is connected between the grid-connected connection end and the load connection end, and the 3rd switching device
It is arranged on the dc bus.
3. grid-connected connection equipment according to claim 1, it is characterised in that also including at least one of：
4th switching device, one end connect the input end, and the other end is used to connect first testing equipment；
5th switching device, one end connect the input end, and the other end is used to connect second testing equipment；
6th switching device, one end connect the input end, and the other end is used to connect the 3rd testing equipment.
4. grid-connected connection equipment according to claim 1, it is characterised in that also include：
Mode controller, connects the switching device and the MPPT controller, and the mode controller is used to control described cutting
Changing device switches between the state of at least one of：The first state, second state, the third state, institute
The 4th state is stated, and controls the MPPT controller and switch to pattern corresponding with the state of the switching device.
5. grid-connected connection equipment according to any one of claim 1 to 4, it is characterised in that also including it is following at least it
One：First testing equipment, second testing equipment, the 3rd testing equipment.
6. grid-connected connection equipment according to any one of claim 1 to 4, it is characterised in that also include：
The 4th testing equipment being arranged on dc bus, connects the input end, wherein, the dc bus is described double
Transmission line between inverter and the inverter, the MPPT controller is for according to the electrical parameter and described
Four testing equipments are in bi-directional inverter described in the voltage and/or current control detected by corresponding test point and/or described inverse
Become device.
7. grid-connected connection equipment according to any one of claim 1 to 4, it is characterised in that the MPPT controller is led to
The signal for crossing one below controls the bi-directional inverter and/or the inverter：Voltage signal, current signal, pulsewidth modulation
Signal.
8. grid-connected connection equipment according to any one of claim 1 to 4, it is characterised in that
The DC generation equipment is photovoltaic power generation equipment；And/or,
The transmission line being connected between the electrical network connection end and the bi-directional inverter is three-phase power transmission line or single-phase
Power transmission line；And/or,
The transmission line being connected between the load connection end and the inverter is three-phase power transmission line or Monophase electric power
Transmission line.
9. a kind of control method of grid-connected connection equipment, it is characterised in that include：
Grid-connected connection end as described in judging in the grid-connected connection equipment any one of claim 1 to 8, as described in electrical network connect
Connect the connection status between end and the load connection end；
The MPPT controller is switched to into control model corresponding with the connection status；
It is described the MPPT controller is switched to into control model corresponding with the connection status to include at least one of：
When the grid-connected connection end disconnects the connection with the electrical network connection end and the load connection end, the MPPT is controlled
Device processed switches to idle mode；
When the load connection end disconnects the connection with the grid-connected connection end and the electrical network connection end, by the MPPT
Controller switches to power generation mode, wherein, under the power generation mode, the MPPT controller is for according to the described first detection
The electrical parameter that equipment and second testing equipment are detected controls the bi-directional inverter；
When the electrical network connection end disconnects the connection with the grid-connected connection end and the load connection end, by the MPPT
Controller switches to load model, wherein, under the power generation mode, for according to first testing equipment and the described 3rd
The electrical parameter that testing equipment is detected controls the inverter；
The electrical network connection end is connected by the bi-directional inverter in the grid-connected connection end and is connected by the inverter
During the load connection end, the MPPT controller is switched to into load power generation mode or load power mode, wherein, in institute
State under load power generation mode, the MPPT controller is for according to first testing equipment, second testing equipment and institute
The electrical parameter control bi-directional inverter and/or the inverter that the 3rd testing equipment is exported are stated, described negative
Under load power mode, the MPPT controller is for detecting according to first testing equipment and the 3rd testing equipment
The electrical parameter controls the bi-directional inverter and/or the inverter.
10. a kind of grid-connected electric power system, it is characterised in that include：
Grid-connected connection equipment as any one of claim 1 to 8；
DC generation equipment, connects the grid-connected connection end of the grid-connected connection equipment；
One or more AC loads, connect the load connection end of the grid-connected connection equipment.
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| CN104135225A (en) * | 2014-07-11 | 2014-11-05 | 珠海格力电器股份有限公司 | Photovoltaic inverter and air conditioner |
| CN106602605B (en) * | 2017-01-03 | 2024-05-03 | 珠海格力电器股份有限公司 | Maximum power point tracking control system of photovoltaic array and photovoltaic air conditioning system |
| CN109494788B (en) * | 2018-11-08 | 2020-09-29 | 珠海格力电器股份有限公司 | Photovoltaic electrical appliance system and voltage protection value control method and device thereof |
| CN109936168B (en) * | 2019-04-30 | 2020-11-10 | 阳光电源股份有限公司 | Inverter, operation method thereof and controller |
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