CN206060575U - Twin-stage three-phase energy accumulation current converter - Google Patents
Twin-stage three-phase energy accumulation current converter Download PDFInfo
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- CN206060575U CN206060575U CN201620865505.9U CN201620865505U CN206060575U CN 206060575 U CN206060575 U CN 206060575U CN 201620865505 U CN201620865505 U CN 201620865505U CN 206060575 U CN206060575 U CN 206060575U
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Abstract
The utility model discloses a kind of twin-stage three-phase energy accumulation current converter, current transformer includes AC/DC conversion modules, DC/DC conversion modules and storage bodies, three-phase alternating current connects the input of AC/DC conversion modules, the outfan of AC/DC conversion modules connects the input of DC/DC conversion modules, the outfan connection storage bodies of DC/DC conversion modules, storage bodies include the first storage bodies and the second storage bodies for concatenating, and the negative pole end of the first storage bodies connects the positive terminal of the second storage bodies.This utility model is directed to phase three-wire three or three-phase and four-line exchange proposes a kind of twin-stage three-phase energy accumulation current converter, and its DC/DC conversion section reduces restriction of the system to DC voltage fluctuation using the topological structure that can realize battery modules redundancy and series connection of original creation.And the power switch of DC/DC conversion modules does not need full-time in high frequency state, the larger efficiency that improve system, reduces power attenuation.
Description
Technical field
This utility model is related to field of circuit technology, specifically a kind of twin-stage three-phase energy accumulation current converter.
Background technology
With expanding economy, the increase of population, and fossil fuel is few, and various countries start to focus on regenerative resource
Development.But the development of the new forms of energy such as wind energy, solar energy, receives invariably the impact of the conditions such as geographical position, weather, causes
Wind energy and solar energy have very strong intermittence, utilize wind energy and solar energy in order to maximum, and energy storage becomes a kind of very reasonable
Solution, although at present various energy storage technologies are each advantageous and not enough, also can as the development energy storage of technology is estimated
Become the solution energy to produce and the effective measures conflicted between load.
In existing energy storage technology scheme, comprising the crucial part of two comparisons：Energy-storage battery part and energy accumulation current converter
Part.The function of battery is exactly that energy stores are got up, and current transformer is for connection to the equipment between battery and electrical network, the equipment
The adjustment equipment of electric current, voltage and power can be realized.
In photovoltaic generating system and energy-storage system, two-way DC-DC converter is all an indispensable part,
The various functions index of two-way DC-DC converter directly influences the performance of total system, such as conversion efficiency, conversion electricity
Press scope, whether there is redundancy feature etc., these indexs and function to have larger demand in actual applications.In new forms of energy
Under fast development, the performance of two-way DC-DC converter is also constantly improving, as the difference of application scenarios it is also proposed
More competitive design.Since eighties of last century, American scholar first proposed the two-way DC-DC of buck and become
Parallel operation, and be applied in satellite sun energy power-supply system.The professor of Hong Kong University and the scholar of Australia also carry in succession
The topological structure of various two-way DC-DC converters is gone out.Later the scholar of Virginia, US begin one's study will be two-way straight
Stream-DC converter is applied in battery energy storage system.
Battery energy storage system according to the actual requirements with control system control command, power adjustments and energy can be carried out and adjusted
Section, can with quick response, with short-duration power, stabilize power swing, to improve the quality of power supply inside microgrid, raising system steady
It is qualitative to wait effect, therefore be widely used.Distributed battery energy storage is in the operation stability for strengthening micro-grid system and carries
There is in terms of the high quality of power supply bigger advantage, effect can be controlled better, the research of current battery energy-storage system is got over
Paid attention to get over.Battery energy storage system includes battery and its management system and two parts of energy conversion system.Energy turns
System is changed as the interface of battery and electrical network, is in the light of actual conditions stored and is released energy, realize energy electrical network and battery it
Between exchange, its essence is exactly powerful energy accumulation current converter.
The structure of battery energy storage Bearss is by battery and battery management system (BBMS, Battery and Battery
Management System) and energy conversion and two part groups of control system (PCS, Power Conversion System)
Into battery carries out energy exchange with electrical network by PCS, and PCS is energy accumulation current converter, used as connecing between accumulator and electrical network
Jaws equipment, controls battery energy storage or releases energy.
Energy accumulation current converter realizes the bidirectional energy between direct current and exchange and exchanges and transmit, and which is substantially voltage transformation
Device, is reached to electrical network by changing energy storage changer AC voltage magnitude and voltage phase angle and injects or absorb active and idle
The purpose of power.When the voltage phase angle for controlling energy-storage system is ahead of the voltage phase angle of access point, active power becomes energy storage
System is flowed into access point；Vice versa.But when needing to system injection reactive power, just control the voltage amplitude of energy accumulation current converter
Voltage magnitude of the value more than access point, reactive power are just flowed into access point by battery energy storage system, and vice versa.It can be seen that, fit
When change current transformer controlled quentity controlled variable can both control it is active and idle between energy-storage system and electrical network.Work in energy-storage system
During, energy accumulation current converter decides the efficiency of whole system as the interface equipment between battery and electrical network, its topological structure
And cost, it is the key factor for affecting systematic economy reliability service.As the topological structure species of energy storage inverter is various, performance
Different, its principle analysis and Performance comparision, improve system effectiveness and reduce production cost etc. and have reasonable selection for structure
Extremely important meaning.Energy accumulation current converter can be divided into two kinds of single stage type and stage type, topological structure according to DC/DC links are whether there is
On difference cause both differences in operating characteristic.
Battery is directly exported energy transmission to electrical network using DC/AC current transformers by single stage type energy accumulation current converter, it is only necessary to one
The transformation of electrical energy of level can just be realized.Work in the discharged condition battery energy storage electric energy by the inversion of DC/AC current transformers for hand over
Flow back to and be fed to electrical network, otherwise line voltage is stored in the battery after rectification is changed into direct current in the charge state.DC/AC modules
Rectification state can be operated in can also to work inverter mode, so as to realize the two-way flow of energy.
Single stage type energy accumulation current converter topology has many good qualities, and such as circuit is simple, components and parts are few, control method is simple, reliable
Property high and high efficiency, it is low in energy consumption the advantages of, but in use, there is certain deficiency in single stage type energy accumulation current converter：
1st, the capacity of the capacity configuration battery according to current transformer, the battery that each Converter Capacity is configured after fixing is needed to hold
Amount can not change substantially.
2nd, a current transformer can only connect battery all the way, must just configure equal number of energy storage and become when there is multichannel battery
Stream device, also can increase difficulty to control system while increasing cost.
3rd, current transformer DC voltage will be limited in a higher scope, therefore the voltage of battery can not be too low, limit
The working range of cell voltage is made.
4th, when current transformer accesses jumbo battery, it is impossible to carry out the equilibrium of voltage and current, cannot also realize charge and discharge
The independent control of electricity.
5th, after current transformer breaks down, accessed battery can all quit work, and circuit reliability is relatively low.
6th, when grid side breaks down, it is possible to produce larger current in PCS DC sides, battery system is had compared with favourable opposition
Hit, cause the damage of set of cells and shorten its life-span.
For more flexible energy hole, using two-stage energy conversion system, become twin-stage current transformer.Prime is DC/
DC changers, for realizing that voltage swing is adjusted and charge/discharge current is controlled.Rear class is DC/AC changers, for realizing output
The sineization of electric current and carry out cutting-in control.According to the difference of control mode, it is also possible to realize control charge/discharge current,
The function of island effect detection.The control difficulty of every one-level is this configuration simplifies, system control can be decoupled, be become direct current
The control targe and means of ring change section and AC/DC link is separately designed.Control system is easier to design and realizes, but
Compare single-stage current transformer to compare, device for power switching is more, caused loss increase reduces the efficiency of system.Bipolar system becomes
The DC converting structure of parallel operation can be divided into：Isolated and non-isolated two kinds of structures.Topological structure with isolating transformer
Middle DC converter is connected with inverter by transformator.Transformator can play a part of to boost and isolate, as isolation becomes
The introducing of depressor increased the cost and volume of system, also reduce energy conversion efficiency.Non-isolation type direct-current converter is general
Comprising three kinds of main topologies：Semi-bridge type, bridge-type and Buck-Boost cascade connection types, also refer in some documents
Non-mainstream circuit structure.The weak point of non-isolation type direct-current converter is that change in voltage can not be too big, but from raising energy
From the perspective of amount conversion efficiency, it is particularly suited for simple or coordinates new forms of energy to access battery energy storage system.
Phase structure and three-phase structure can be divided into from the structure of energy accumulation current converter, phase structure is mainly used in little Rong
The energy accumulation current converter of amount, for the energy storage of family use or some special occasions.The general capacity set of the energy accumulation current converter of three-phase structure
In in 50-500kw, jumbo power station level energy storage occasion in being applied to.It is for three-phase structure, larger due to becoming current capacity, it is right
It is just higher in the requirement of efficiency.And as transformator can be cancelled using two-stage unsteady flow scheme, have larger excellent on cost
Gesture, but traditional control method is all that this has resulted in larger power attenuation, total system using higher switching frequency
It is less efficient.
Utility model content
This patent is directed to problem present in background technology, using two-stage current transformer structure, by the control algolithm for optimizing,
Switching frequency is reduced, system effectiveness is improved, realization can be with the structure of redundancy.The purpose of this utility model is to provide a kind of, with
Overcome defect present in prior art.
The purpose of this utility model is achieved through the following technical solutions：
A kind of twin-stage three-phase energy accumulation current converter, it includes AC/DC conversion modules, DC/DC conversion modules and storage bodies, three-phase
The input of exchange connection AC/DC conversion modules, the outfan of AC/DC conversion modules connect the input of DC/DC conversion modules,
The outfan connection storage bodies of DC/DC conversion modules, storage bodies include the first storage bodies and the second storage bodies for concatenating, the first storage
The negative pole end of energy body connects the positive terminal of the second storage bodies, wherein：
AC/DC conversion modules include three-phase bridge rectifier circuit, and the three-phase bridge rectifier circuit includes that the first power is opened
Guan Guan, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 9th power switch pipe and the tenth power are opened
Guan Guan：A phases connect the first power switch pipe and the second power switch pipe respectively, and B phases connect the 3rd power switch pipe and respectively
Four power switch pipes, C phases connect the 9th power switch pipe and the tenth power switch pipe respectively；
DC/DC conversion modules include the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe, the 8th work(
Rate switching tube, the positive voltage output end of AC/DC conversion modules connect respectively the 5th power switch pipe, the one of the 6th power switch pipe
End；The other end of the 5th power switch pipe：One side is defeated by the low-voltage that the 7th power switch pipe takes back AC/DC conversion modules
Go out end, on the other hand connect the positive terminal of the first storage bodies；The other end of the 6th power switch pipe：On the one hand pass through the 8th power
Switching tube takes back the low-voltage output end of AC/DC conversion modules, is on the other hand connected between the first storage bodies and the second storage bodies；
The negative pole end of the second storage bodies takes back the low-voltage output end of AC/DC conversion modules.
Preferably, the storage bodies are dc-battery.
Preferably：
When the three-phase alternating current is powered for phase three-wire three：The AC/DC conversion modules also include the first filter capacitor, described
First filter capacitor is connected to three-phase bridge rectifier circuit DC output side two ends, for stabilizing DC voltage；
When the three-phase alternating current is powered for three-phase and four-line：The AC/DC conversion modules also include the first filter capacitor and the
Two filter capacitors, first filter capacitor and the second filter capacitor are serially connected with three-phase bridge rectifier circuit DC output side two
End, for stabilizing DC voltage, the neutral conductor N of three-phase and four-line is connected between the first filter capacitor and the second filter capacitor；Direct current
Outlet side voltage Vc1=the first both ends of filter capacitor voltage Vc01+ the second both ends of filter capacitor voltage Vc02.
Preferably, the DC/DC conversion modules also include the first filter inductance and the second filter inductance, first energy storage
The positive terminal of body connects the 5th power switch pipe and the 7th power switch pipe, second energy storage respectively by the first filter inductance
The negative pole end of body takes back the low-voltage output end of AC/DC conversion modules by the second filter inductance；First filter inductance and second
Filter inductance is used to smooth current waveform, limits the mutation of electric current.
Preferably, power switch pipe is IGBT or MOSFET, or realizes other power switch of switching function
Pipe.
A kind of control method of twin-stage three-phase energy accumulation current converter, based on twin-stage three-phase energy storage unsteady flow disclosed in this utility model
Device, it includes three kinds of mode of operations：
In mode of operation one, the 6th power switch pipe and the 8th power switch pipe are in normal off open state, the 5th power
Switching tube and the 7th power switch pipe are in alternating conductive state, and the first storage bodies and the second storage bodies are in series connection, the two
It is common to participate in power change；Therefore voltage when global voltage will be higher than single one storage bodies participation work.The control of circuit
System is just more flexible, and the function that can be realized more is enriched, and reduces overall circuit function to single storage bodies voltage pulsation
Dependence, can single energy storage carry voltage it is relatively low when realize reactive-load compensation, harmonics restraint and normal power conversion, nothing
Need the transformator of AC.
In mode of operation two, the 6th power switch pipe is in normal off open state, and the 8th power switch pipe is in often conducting
State, the 5th power switch pipe and the 7th power switch pipe are in alternating conductive state, and only the first storage bodies participate in electric energy conversion；
Therefore when the second storage bodies break down or voltage is reduced to 0, it is possible to cut in mode of operation two, using the first energy storage
Body participates in energy conversion, does not interfere with circuit work.In mode of operation two, the second storage bodies pass through the second filter inductance and the 8th
Power switch pipe defines path, as the second storage bodies in this on off state are not involved in work and this cutting
The dump energy that will judge the second storage bodies before on off state is relatively low, voltage is relatively low, breaking or artificial the second storage bodies of excision
In the case of, this mode of operation could be entered.So this branch road seems closure, but electric current or electric current be not less, can
To ignore.
In mode of operation three, the 5th power switch pipe and the 7th power switch pipe are in normal off open state, the 6th power
Switching tube and the 7th power switch pipe are in alternating conductive state, and only the second storage bodies participate in electric energy conversion.Due to this switch
The first storage bodies in state are not involved in work, and the residue electricity of the first storage bodies will be judged before this on off state is cut
In the case of measuring relatively low, breaking or artificial the first storage bodies of excision of too low, voltage, this on off state could be entered.So
This branch road seems closure, but electric current or electric current be not less, it is possible to ignore.
Preferably, mode of operation one includes two on off states：
First switch state：5th power switch pipe is turned on, and the 7th power switch pipe disconnects, the 6th power switch pipe and the
Eight power switch pipes are in cut-off state due to bearing backward voltage, power flow direction by the first storage bodies, the second storage bodies, first
Filter inductance, the second filter inductance flow to the DC output side Vc1 of AC/DC conversion modules；The electric current iL1 of the first filter inductance and
The electric current iL2 of the second filter inductance is identical, on a declining curve, and numerical value meets：Output electricity
Pressure Vc1=Vdc1+Vdc2；Wherein：Vdc1 is the voltage of the first storage bodies, and Vdc2 is the voltage of the second storage bodies；
Second switch state：5th power switch pipe disconnects, the conducting of the 7th power switch pipe, the 5th power switch pipe and the
Eight power switch pipes are in cut-off state due to bearing backward voltage, and power flow direction is by the first storage bodies, the second storage bodies to
One filter inductance, the second filter inductance are charged；The electric current iL2 of the electric current iL1 and the second filter inductance of the first filter inductance
Identical, in rising trend, numerical value meets：
More excellent, the control targe minima for defining DC output side voltage Vc1 is Vc1_Ref.min, first switch shape
State and second switch state are selected according to DC output side voltage Vc1：
Work as Vdc1+Vdc2>During Vc1_Ref.min, by the way of single-stage control strategy, first switch state is selected, this
Sample it is avoided that power switch pipe frequent movement, the larger switching loss for reducing power switch pipe improves system
Efficiency；
As Vdc1+Vdc2=Vc1_Ref.min, circuit be switched to buck-boost work, the 5th power switch pipe and
7th power switch pipe is in alternate conduction, and first switch state and second switch state are alternately present.Now, the first filter inductance
Electric current iL1 and the electric current iL2 of the second filter inductance be not in interrupted situation, all the time in triangular wave state, define work
In pattern one, the switch periods of the 5th power switch pipe are T1, and the dutycycle of the 5th power switch pipe is D1, is had following three kinds
The situation of electric current occurs：
1), work as iL1=iL2>When 0, Vc1=/(1-D1)；
2), work as iL1=iL2<When 0, Vc1=/D1；
3), work as iL1=iL2, and when 0 value occurs alternatively up and down, energy Flow is depending on iL1=iL2 to the time
Integration.If integrated value>0, then power is by the first storage bodies and the DC output side of the second energy storage direction of flow AC/DC conversion module
Vc1, Vc1 are in rising trend；Conversely, the integrated value as iL1=iL2 to the time<0, then direct current of the power by AC/DC conversion modules
To the first storage bodies and the second energy storage bulk charging, the overall power of system is by exchanging lateral first storage bodies and for outlet side Vc1
Two energy storage bulk chargings, the system are operated in rectification state.
Preferably, mode of operation two includes two on off states：
3rd on off state：5th power switch pipe is turned on, and the 7th power switch pipe disconnects, the 6th power switch pipe and the
Seven power switch pipes are in cut-off state due to bearing backward voltage, and power flow direction becomes mold changing by the first energy storage direction of flow AC/DC
The DC output side Vc1 of block；The electric current iL1 of the first filter inductance is on a declining curve, and numerical value meets：Wherein：
Vdc1 is the voltage of the first storage bodies；
4th on off state：5th power switch pipe disconnects, and the conducting of the 7th power switch pipe, the first storage bodies pass through power
Switching tube and the 8th power switch pipe form a current path, and the first storage bodies charge to the first filter inductance；First filtering
The electric current iL1 of inductance is in rising trend, and numerical value meets：
In mode of operation two, the 3rd on off state and the 4th on off state are alternately present.The electric current of the first filter inductance
IL1 is not in interrupted situation, all the time in triangular wave state, the second filter inductance connection the second storage bodies or due to failure
State, exits circuit work, therefore iL2 is approximately 0, and the switch periods for defining the 5th power switch pipe in mode of operation two are
T2, the dutycycle of the 5th power switch pipe is D2, and the situation for having following three kinds of electric currents occurs：
1), work as iL1>When 0, Vc1=Vdc1/ (1-D2)；
2), work as iL1<When 0, Vc1=Vdc1/D2；
3), when iL1 occurs alternatively up and down in 0 value, energy Flow depends on integrations of the iL1 to the time.If integrated value>
0, then DC output side Vc1 of the power by the first energy storage direction of flow AC/DC conversion module, system are operated in inverter mode；Conversely,
When integrated values of the iL1 to the time<0, then power from the DC output side Vc1 of AC/DC conversion modules to the first energy storage bulk charging be
System is operated in rectification state.
Preferably, mode of operation three includes two on off states：
5th on off state：6th power switch pipe is turned on, and the 8th power switch pipe disconnects, and power flow direction is by the second energy storage
Body and the second filter inductance flow to the DC output side Vc1 of AC/DC conversion modules；The electric current iL2 of the second filter inductance is in decline
Trend, numerical value meet：
6th on off state：6th power switch pipe disconnects, and the conducting of the 8th power switch pipe, the second storage bodies are filtered to second
Ripple inductance is charged, and the electric current iL2 of the second filter inductance is in rising trend, and numerical value meets
In mode of operation three, the 5th on off state and the 6th on off state are alternately present.The electric current of the second filter inductance
IL2 is not in interrupted situation, all the time in triangular wave state, the first filter inductance connection the first storage bodies or due to failure
State, exits circuit work, therefore iL1 is approximately 0, and the switch periods for defining the 6th power switch pipe 6 in mode of operation three are
T3, the dutycycle of the 6th power switch pipe is D3, and the situation for having following three kinds of electric currents occurs：
1), work as iL2>When 0, Vc1=Vdc2/ (1-D3)；
2), work as iL2<When 0, Vc1=Vdc2/D3；
3), when iL2 occurs alternatively up and down in 0 value, energy Flow depends on integrations of the iL2 to the time.If integrated value>
0, then DC output side Vc1 of the power by the second energy storage direction of flow AC/DC conversion module, system are operated in inverter mode；Conversely,
When integrated values of the iL2 to the time<0, then power from the DC output side Vc1 of AC/DC conversion modules to the first energy storage bulk charging be
System is operated in rectification state.
A kind of control system of twin-stage three-phase energy accumulation current converter, based on twin-stage three-phase energy storage unsteady flow disclosed in this utility model
Device, control system include separate AC/DC conversion modules control system and DC/DC conversion module control systems, and the two is using letter
The mode of breath interaction realizes the linkage between rotection thresholds, and first, the control command of outside input has been converted to by control system
Work(current reference value Id_Ref and reactive current reference value Iq_Ref, watt current reference value Id_Ref and reactive current reference value
Iq_Ref can also be directly inputted, then：
AC/DC conversion module control systems：
When the three-phase alternating current is powered for phase three-wire three：Control system Real-time Collection Vab and Vbc, electric current ia and electric current ic
Actual information, Vab is voltage instantaneous value between A phases and B phases, and Vbc is the voltage instantaneous value between B phases and C phases, electric current ia
For the electric current instantaneous value of A phases, electric current instantaneous values of the electric current ib for B phases；By Vab and Vbc by phase-locked loop module obtain phase place and
Amplitude information, including：The information of sin_cos, ω and Um, uses when these information are converted as Tabc/dq；By electric current ia and electricity
Stream ic does Tabc/dq conversion, obtains actually detected feedback current：Watt current id and reactive current iq；By active power id
Error is obtained after being compared with watt current reference value Id_Ref and reactive current reference value Iq_Ref with reactive current iq；Will
Error carries out decoupling computation respectively through two PI modules；Decoupling result obtains control life after Tabc/dq inverse transform blocks
Order, and after on-off control order generation module, ingoing power switch drive module；Power switch drive module will control life
Order output is to AC/DC conversion modules；Two PI modules herein are important, serve the central role of control system, and this two
The integral coefficient and proportionality coefficient of individual PI modules flexibly can be arranged.
When the three-phase alternating current is powered for three-phase and four-line：Only have in control system Real-time Collection voltage, electric current instantaneous value
Institute is different, when three-phase and four-line is powered, control system Real-time Collection phase voltage vaN, vbN, vcN and phase current iaN, ibN, icN,
Other control logics and control process are all identical with three-phase three-wire system；
DC/DC conversion module control systems, are divided into three steps：
The first step, mode of operation are selected：Such as no storage bodies failure, then select mode of operation one；Such as the event of the first storage bodies
Barrier, then select mode of operation three；Such as the second storage bodies failure, then mode of operation two is selected；Such as the first storage bodies and the second energy storage
Body reports failure, then system-down；In specific embodiment：If storage bodies are battery, it is possible to use battery management system
Whether the signal that system is given judges storage bodies in malfunction；If for the storage bodies for not having battery management system, could be with
Judged by the voltage and current of storage bodies, concrete judgment mode is by the way of threshold value compares.I.e. no matter for which kind of
Storage bodies, can all correspond to characteristic curve, if the electric current returned of real-time monitoring and voltage curve deviate storage bodies characteristic curve, just
Judge storage bodies failure, fault-signal is exported and gives mode of operation selecting module, as the foundation that mode of operation is selected.
Second step, on off state are selected：Using the energy storage bulk voltage of real-time detection as basis for estimation, such as in mode of operation one
Kind, energy storage bulk voltage is vdc1+vdc2；If selecting mode of operation two, energy storage bulk voltage is vdc1；If selecting mode of operation
Three, energy storage bulk voltage is vdc2；If energy storage bulk voltage is higher than the receptible minimum direct current magnitude of voltage Vc1_Ref.min of system institute,
Then in mode of operation one select first switch state；The 3rd on off state is selected in mode of operation two；In mode of operation three
The 5th on off state of middle selection；
3rd step, dutycycle are calculated；
Finally by off state select and dutycycle calculate result transmit to control command generation module, and then export to
Power switch drive module.
The beneficial effects of the utility model
This utility model is directed to phase three-wire three or three-phase and four-line exchange proposes a kind of twin-stage three-phase energy accumulation current converter, its DC/
DC conversion sections reduce system to DC voltage using the topological structure that can realize battery modules redundancy and series connection of original creation
The restriction of fluctuation, and the fault redundance of dc-battery can be realized, it is when one of dc-battery breaks down, overall
Circuit can still utilize an other dc-battery job, improve the stability of current transformer.And DC/DC conversion modules
Power switch does not need full-time in high frequency state, the larger efficiency that improve system, reduces power attenuation.
Propose the control strategy of innovation simultaneously based on the structure, can be with the efficiency of larger raising system.
Description of the drawings
The circuit diagram of twin-stage three-phase energy accumulation current converter when Fig. 1 is phase three-wire three connection.
The control system figure of twin-stage three-phase energy accumulation current converter when Fig. 2 is phase three-wire three connection.
The AC/DC conversion module control system figures of twin-stage three-phase energy accumulation current converter when Fig. 3 is phase three-wire three connection.
The DC/DC conversion module control system figures of twin-stage three-phase energy accumulation current converter when Fig. 4 is phase three-wire three connection.
The circuit diagram of twin-stage three-phase energy accumulation current converter when Fig. 5 is three-phase and four-line connection.
The control system figure of twin-stage three-phase energy accumulation current converter when Fig. 6 is three-phase and four-line connection.
The AC/DC conversion module control system figures of twin-stage three-phase energy accumulation current converter when Fig. 7 is three-phase and four-line connection.
The DC/DC conversion module control system figures of twin-stage three-phase energy accumulation current converter when Fig. 8 is three-phase and four-line connection.
Specific embodiment
With reference to embodiment, the utility model is described in further detail, but protection domain of the present utility model is not limited to
This：
Embodiment 1：With reference to Fig. 1 and Fig. 5, a kind of twin-stage three-phase energy accumulation current converter, it includes AC/DC conversion modules, DC/DC
Conversion module and storage bodies, three-phase alternating current connect the input of AC/DC conversion modules, the outfan connection of AC/DC conversion modules
The input of DC/DC conversion modules, the outfan connection storage bodies of DC/DC conversion modules, storage bodies include the first storage for concatenating
Energy body 111 and the second storage bodies 112, the negative pole end of the first storage bodies 111 connect the positive terminal of the second storage bodies 112, wherein：
AC/DC conversion modules include three-phase bridge rectifier circuit, and the three-phase bridge rectifier circuit includes that the first power is opened
Close pipe 101, the second power switch pipe 102, the 3rd power switch pipe 103, the 4th power switch pipe 104, the 9th power switch pipe
115 and the tenth power switch pipe 114：A phases connect the first power switch pipe 101 and the second power switch pipe 102, B phases point respectively
Not Lian Jie the 3rd power switch pipe 103 and the 4th power switch pipe 104, C phases connect the 9th power switch pipe 115 and the tenth respectively
Power switch pipe 114；
DC/DC conversion modules include the 5th power switch pipe 105, the 6th power switch pipe 106, the 7th power switch pipe
107th, the 8th power switch pipe 108, the positive voltage output end of AC/DC conversion modules connect respectively the 5th power switch pipe 105,
One end of six power switch pipes 106；The other end of the 5th power switch pipe 105：On the one hand connect by the 7th power switch pipe 107
The low-voltage output end of AC/DC conversion modules is gone back to, on the other hand connects the positive terminal of the first storage bodies 111；6th power switch
The other end of pipe 106：On the one hand the low-voltage output end of AC/DC conversion modules is taken back by the 8th power switch pipe 108, it is another
Aspect is connected between the first storage bodies 111 and the second storage bodies 112；The negative pole end of the second storage bodies 112 takes back AC/DC and becomes mold changing
The low-voltage output end of block.
Preferably, the storage bodies are dc-battery.
Embodiment 2：A kind of twin-stage three-phase energy accumulation current converter as described in Example 1,
When the three-phase alternating current is powered for phase three-wire three：With reference to Fig. 1, the AC/DC conversion modules are also including the first filtering
Electric capacity 113, first filter capacitor 113 are connected to three-phase bridge rectifier circuit DC output side Vc1 two ends, for stabilizing direct current
Voltage；
When the three-phase alternating current is powered for three-phase and four-line：With reference to Fig. 5, the AC/DC conversion modules are also including the first filtering
It is whole that electric capacity 113 and the second filter capacitor 116, first filter capacitor 113 and the second filter capacitor 116 are serially connected with three-phase bridge
Current circuit DC output side Vc1 two ends, for stabilizing DC voltage, the neutral conductor N of three-phase and four-line is connected to the first filter capacitor 113
And second between filter capacitor 116；DC output side Vc1=the first filter capacitor 113Vc01+ the second filter capacitor 116Vc02.
Embodiment 3：A kind of twin-stage three-phase energy accumulation current converter as described in Example 1, the DC/DC conversion modules also include
First filter inductance 109 and the second filter inductance 110, the positive terminal of first storage bodies 111 pass through the first filter inductance
109 connect the 5th power switch pipe 105 and the 7th power switch pipe 107 respectively, and the negative pole end of second storage bodies 112 passes through
Second filter inductance 110 takes back the low-voltage output end of AC/DC conversion modules；First filter inductance 109 and the second filter inductance
110 are used to smooth current waveform, limit the mutation of electric current.
Embodiment 4：A kind of as described in Example 1 twin-stage three-phase energy accumulation current converter, power switch pipe be IGBT or
MOSFET, or realize other power switch pipes of switching function.
Embodiment 5：With reference to Fig. 2 and Fig. 6, a kind of control system of twin-stage three-phase energy accumulation current converter, based on this utility model
Disclosed twin-stage three-phase energy accumulation current converter, control system include that separate AC/DC conversion modules control system and DC/DC become mold changing
Block control system, the two realizes the linkage between rotection thresholds by the way of information exchange, and first, control system will be outside defeated
The control command (for reference, conversion method is prior art for active reference and nothing) for entering is converted to watt current reference value Id_Ref
With reactive current reference value Iq_Ref, watt current reference value Id_Ref and reactive current reference value Iq_Ref can also be direct
Input, then：
AC/DC conversion module control systems：
When the three-phase alternating current is powered for phase three-wire three：With reference to Fig. 2-3, control system Real-time Collection Vab and Vbc, electric current
The actual information of ia and electric current ic, Vab are the voltage instantaneous value between A phases and B phases, and Vbc is the voltage reality between B phases and C phases
Duration, electric current instantaneous values of the electric current ia for A phases, electric current instantaneous values of the electric current ib for B phases；Vab and Vbc is passed through into phaselocked loop
(PLL) module obtains phase and amplitude information, including：The information of sin_cos, ω and Um, these information are converted as Tabc/dq
When use (Tabc/dq convert and be inversely transformed into prior art, here is omitted)；Electric current ia and electric current ic are done into Tabc/dq
Conversion, obtains actually detected feedback current：Watt current id and reactive current iq；By active power id and reactive current iq with
Watt current reference value Id_Ref and reactive current reference value Iq_Ref obtain error after being compared；By error respectively through two
Individual PI modules carry out decoupling computation；Decoupling result obtains control command after Tabc/dq inverse transform blocks, and through switch control
After order generation module processed, ingoing power switch drive module；Control command is exported AC/DC and is become by power switch drive module
Mold changing block；Two PI modules herein are important, serve the central role of control system, the integration system of the two PI modules
Number and proportionality coefficient flexibly can be arranged.
When the three-phase alternating current is powered for three-phase and four-line：With reference to Fig. 6-7, only in control system Real-time Collection voltage, electric current
It is different during instantaneous value, when three-phase and four-line is powered, control system Real-time Collection phase voltage vaN, vbN, vcN and phase current
IaN, ibN, icN, other control logics and control process it is all identical with three-phase three-wire system；
DC/DC conversion module control systems, with reference to Fig. 4 and Fig. 8, are divided into three steps：
The first step, mode of operation are selected：Such as no storage bodies failure, then select mode of operation one；Such as the first storage bodies 111
Failure, then select mode of operation three；Such as 112 failure of the second storage bodies, then mode of operation two is selected；Such as 111 He of the first storage bodies
Second storage bodies 112 report failure, then system-down；In specific embodiment：If storage bodies are battery, it is possible to use
Whether the signal that battery management system (BMS) is given judges storage bodies in malfunction；If for no battery management system
The storage bodies of system, can be judged by the voltage and current of storage bodies, concrete judgment mode is by the way of threshold value compares.
I.e. no matter for which kind of storage bodies, characteristic curve can be all corresponded to, if the electric current returned of real-time monitoring and voltage curve deviate storage
Energy bulk properties curve, is judged as storage bodies failure, fault-signal is exported and gives mode of operation selecting module, selects as mode of operation
The foundation selected.
Second step, on off state are selected：Using the energy storage bulk voltage of real-time detection as basis for estimation, such as in mode of operation one
Kind, energy storage bulk voltage is vdc1+vdc2；If selecting mode of operation two, energy storage bulk voltage is vdc1；If selecting mode of operation
Three, energy storage bulk voltage is vdc2；If energy storage bulk voltage is higher than the receptible minimum direct current magnitude of voltage Vc1_Ref.min of system institute,
Then in mode of operation one select first switch state；The 3rd on off state is selected in mode of operation two；In mode of operation three
The 5th on off state of middle selection；
3rd step, dutycycle are calculated；
Finally by off state select and dutycycle calculate result transmit to control command generation module, and then export to
Power switch drive module.
Embodiment 6：A kind of control method of twin-stage three-phase energy accumulation current converter, based on twin-stage three-phase disclosed in this utility model
Energy accumulation current converter, it includes three kinds of mode of operations：
In mode of operation one, the 6th power switch pipe 106 and the 8th power switch pipe 108 are in normal off open state, the
Five power switch pipes 105 and the 7th power switch pipe 107 are in alternating conductive state, the first storage bodies 111 and the second storage bodies
112 is in series connection, and the two participates in power change jointly；Therefore global voltage will be higher than single one storage bodies participation work
When voltage.The control of circuit is just more flexible, and the function that can be realized more is enriched, and reduces overall circuit function to list
The dependence of one storage bodies voltage pulsation, can single energy storage carry voltage it is relatively low when realize reactive-load compensation, harmonics restraint and
Normal power conversion, without the need for the transformator of AC.
In mode of operation two, the 6th power switch pipe 106 is in normal off open state, and the 8th power switch pipe 108 is in
Normally on, the 5th power switch pipe 105 and the 7th power switch pipe 107 are in alternating conductive state, only the first storage bodies
111 participate in electric energy conversion；Therefore when the second storage bodies 112 break down or voltage is reduced to 0, it is possible to cut mode of operation
In two, energy conversion is participated in using the first storage bodies 111, do not interfere with circuit work.In mode of operation two, the second storage bodies
112 define path by the second filter inductance 110 and the 8th power switch pipe 108, due to second in this on off state
Storage bodies 112 are not involved in work, and to judge before this on off state is cut the dump energy of the second storage bodies 112 compared with
Low, voltage is relatively low, breaking or artificial the second storage bodies of excision 112 in the case of, this mode of operation could be entered.So this
Branch road seems closure, but electric current or electric current be not less, can ignore.
In mode of operation three, the 5th power switch pipe 105 and the 7th power switch pipe 107 are in normal off open state, the
Six power switch pipes 106 and the 7th power switch pipe 107 are in alternating conductive state, and only the second storage bodies 112 participate in electric energy turn
Change.As the first storage bodies 111 in this on off state are not involved in work, and to judge before this on off state is cut
The dump energy of the first storage bodies 111 is too low, voltage is relatively low, in the case of breaking or artificial the first storage bodies of excision 111,
This on off state can be entered.So this branch road seems closure, but electric current or electric current be not less, it is possible to ignores.
Embodiment 7：A kind of control method of twin-stage three-phase energy accumulation current converter as described in Example 6, mode of operation one are wrapped
Include two on off states：
First switch state：5th power switch pipe 105 is turned on, and the 7th power switch pipe 107 disconnects, the 6th power switch
Pipe 106 and the 8th power switch pipe 108 are in cut-off state due to bearing backward voltage, power flow direction by the first storage bodies 111,
Second storage bodies 112, the first filter inductance 109, the second filter inductance 110 flow to the DC output side of AC/DC conversion modules
Vc1；The electric current iL2 of the electric current iL1 of the first filter inductance 109 and the second filter inductance 110 is identical, on a declining curve, numerical value
Meet：Output voltage Vc1=Vdc1+Vdc2；Wherein：Vdc1 is the first storage bodies 111
Voltage, Vdc2 is the voltage of the second storage bodies 112；
Second switch state：5th power switch pipe 105 disconnects, and the 7th power switch pipe 107 is turned on, the 5th power switch
Pipe 105 and the 8th power switch pipe 108 are in cut-off state due to bearing backward voltage, power flow direction by the first storage bodies 111,
Second the first filter inductance 109 of storage bodies 112 pairs, the second filter inductance 110 are charged；The electric current of the first filter inductance 109
The electric current iL2 of iL1 and the second filter inductance 110 is identical, in rising trend, and numerical value meets：
Embodiment 8：A kind of control method of twin-stage three-phase energy accumulation current converter, defines direct current output as described in Example 7
The control targe minima of side voltage Vc1 is Vc1_Ref.min, and first switch state and second switch state are according to direct current output
Side voltage Vc1 and select：
Work as Vdc1+Vdc2>During Vc1_Ref.min, by the way of single-stage control strategy, first switch state is selected, this
Sample it is avoided that power switch pipe frequent movement, the larger switching loss for reducing power switch pipe improves system
Efficiency；
As Vdc1+Vdc2=Vc1_Ref.min, circuit is switched to buck-boost work, the 5th power switch pipe 105
It is in alternate conduction with the 7th power switch pipe 107, first switch state and second switch state are alternately present.Now, the first filter
The electric current iL2 of the electric current iL1 of ripple inductance 109 and the second filter inductance 110 is not in interrupted situation, wavy in triangle all the time
State, the switch periods for defining the 5th power switch pipe 105 in mode of operation one are T1, the dutycycle of the 5th power switch pipe 105
For D1, the situation appearance of following three kinds of electric currents is had：
1), work as iL1=iL2>When 0, Vc1=(Vdc1+Vdc2)/(1-D1)；
2), work as iL1=iL2<When 0, Vc1=(Vdc1+Vdc2)/D1；
3), work as iL1=iL2, and when 0 value occurs alternatively up and down, energy Flow is depending on iL1=iL2 to the time
Integration.If integrated value>0, then power flow to the straight of AC/DC conversion modules by the first storage bodies 111 and the second storage bodies 112
Stream outlet side Vc1, Vc1 are in rising trend；Conversely, the integrated value as iL1=iL2 to the time<0, then power is by AC/DC change mold changings
The DC output side Vc1 of block charges to the first storage bodies 111 and the second storage bodies 112, and the overall power of system is lateral by exchanging
First storage bodies 111 and the second storage bodies 112 charge, and the system is operated in rectification state.
Embodiment 9：A kind of control method of twin-stage three-phase energy accumulation current converter as described in Example 6, mode of operation two are wrapped
Include two on off states：
3rd on off state：5th power switch pipe 105 is turned on, and the 7th power switch pipe 107 disconnects, the 6th power switch
Pipe 106 and the 7th power switch pipe 107 are in cut-off state due to bearing backward voltage, and power flow direction is by the first storage bodies 111
Flow to the DC output side Vc1 of AC/DC conversion modules；The electric current iL1 of the first filter inductance 109 is on a declining curve, and numerical value meets：Wherein：Vdc1 is the voltage of the first storage bodies 111；
4th on off state：5th power switch pipe 105 disconnects, and the 7th power switch pipe 107 is turned on, the first storage bodies
111 pass through power switch pipe 107 and one current path of formation of the 8th power switch pipe 108, and the first storage bodies 111 are to the first filter
Ripple inductance 109 charges；The electric current iL1 of the first filter inductance 109 is in rising trend, and numerical value meets：
In mode of operation two, the 3rd on off state and the 4th on off state are alternately present.The electricity of the first filter inductance 109
Stream iL1 be not in interrupted situation, all the time in triangular wave state, the second filter inductance 110 connection the second storage bodies 112 or
Due to malfunction, circuit work is exited, therefore iL2 is approximately 0, the 5th power switch pipe 105 in definition mode of operation two
Switch periods are T2, and the dutycycle of the 5th power switch pipe 105 is D2, and the situation for having following three kinds of electric currents occurs：
1), work as iL1>When 0, Vc1=Vdc1/ (1-D2)；
2), work as iL1<When 0, Vc1=Vdc1/D2；
3), when iL1 occurs alternatively up and down in 0 value, energy Flow depends on integrations of the iL1 to the time.If integrated value>
0, then power the DC output side Vc1 of AC/DC conversion modules is flowed to by the first storage bodies 111, system is operated in inverter mode；Instead
It, when integrated values of the iL1 to the time<0, then power is from the DC output side Vc1 of AC/DC conversion modules to the first storage bodies 111
Charge, system is operated in rectification state.
Embodiment 10：A kind of control method of twin-stage three-phase energy accumulation current converter as described in Example 6, mode of operation three guarantees
Include two on off states：
5th on off state：6th power switch pipe 106 is turned on, and the 8th power switch pipe 108 disconnects, and power flow direction is by
Two storage bodies 112 and the second filter inductance 110 flow to the DC output side Vc1 of AC/DC conversion modules；Second filter inductance 110
Electric current iL2 it is on a declining curve, numerical value meet：
6th on off state：6th power switch pipe 106 disconnects, and the 8th power switch pipe 108 is turned on, the second storage bodies
112 pairs of the second filter inductances 110 are charged, and the electric current iL2 of the second filter inductance 110 is in rising trend, and numerical value meets
In mode of operation three, the 5th on off state and the 6th on off state are alternately present.The electricity of the second filter inductance 110
Stream iL2 be not in interrupted situation, all the time in triangular wave state, the first filter inductance 109 connection the first storage bodies 111 or
Due to malfunction, circuit work is exited, therefore iL1 is approximately 0, the 6th power switch pipe 1056 in definition mode of operation three
Switch periods are T3, and the dutycycle of the 6th power switch pipe 106 is D3, and the situation for having following three kinds of electric currents occurs：
1), work as iL2>When 0, Vc1=Vdc2/ (1-D3)；
2), work as iL2<When 0, Vc1=Vdc2/D3；
3), when iL2 occurs alternatively up and down in 0 value, energy Flow depends on integrations of the iL2 to the time.If integrated value>
0, then power the DC output side Vc1 of AC/DC conversion modules is flowed to by the second storage bodies 112, system is operated in inverter mode；Instead
It, when integrated values of the iL2 to the time<0, then power is from the DC output side Vc1 of AC/DC conversion modules to the first storage bodies 111
Charge, system is operated in rectification state.
Above example is merely to illustrate the technical solution of the utility model, rather than the limit to this utility model protection domain
System, although having made to explain to this utility model with reference to preferred embodiment, it will be understood by those within the art that,
The technical solution of the utility model can be modified or equivalent, without deviating from the essence of technical solutions of the utility model
And scope.
Claims (4)
1. a kind of twin-stage three-phase energy accumulation current converter, it is characterised in that it includes AC/DC conversion modules, DC/DC conversion modules and storage
Energy body, three-phase alternating current connect the input of AC/DC conversion modules, the outfan connection DC/DC conversion modules of AC/DC conversion modules
Input, the outfan connection storage bodies of DC/DC conversion modules, storage bodies include the first storage bodies (111) and for concatenating
Two storage bodies (112), the negative pole end of the first storage bodies (111) connect the positive terminal of the second storage bodies (112), wherein：
AC/DC conversion modules include three-phase bridge rectifier circuit, and the three-phase bridge rectifier circuit includes the first power switch pipe
(101), the second power switch pipe (102), the 3rd power switch pipe (103), the 4th power switch pipe (104), the 9th power are opened
Close pipe (115) and the tenth power switch pipe (114)：A phases connect the first power switch pipe (101) and the second power switch pipe respectively
(102), B phases connect the 3rd power switch pipe (103) and the 4th power switch pipe (104) respectively, and C phases connect the 9th power respectively
Switching tube (115) and the tenth power switch pipe (114)；
DC/DC conversion modules include the 5th power switch pipe (105), the 6th power switch pipe (106), the 7th power switch pipe
(107), the 8th power switch pipe (108), the positive voltage output end of AC/DC conversion modules connect the 5th power switch pipe respectively
(105), one end of the 6th power switch pipe (106)；The other end of the 5th power switch pipe (105)：On the one hand pass through the 7th work(
Rate switching tube (107) takes back the low-voltage output end of AC/DC conversion modules, is on the other hand just connecting the first storage bodies (111)
Extremely；The other end of the 6th power switch pipe (106)：On the one hand AC/DC is taken back by the 8th power switch pipe (108) and becomes mold changing
The low-voltage output end of block, is on the other hand connected between the first storage bodies (111) and the second storage bodies (112)；Second storage bodies
(112) negative pole end takes back the low-voltage output end of AC/DC conversion modules.
2. a kind of twin-stage three-phase energy accumulation current converter according to claim 1, it is characterised in that
When the three-phase alternating current is powered for phase three-wire three：The AC/DC conversion modules also include the first filter capacitor (113), institute
State the first filter capacitor (113) and be connected to three-phase bridge rectifier circuit DC output side two ends, for stabilizing DC voltage；
When the three-phase alternating current is powered for three-phase and four-line：The AC/DC conversion modules also include the first filter capacitor (113) and the
Two filter capacitors (116), first filter capacitor (113) and the second filter capacitor (116) are serially connected with three-phase bridge rectification electricity
Road DC output side two ends, for stabilizing DC voltage, the neutral conductor N of three-phase and four-line is connected to the first filter capacitor (113) and
Between two filter capacitors (116)；DC output side voltage Vc1=the first filter capacitor (113) both end voltages Vc01+ second are filtered
Electric capacity (116) both end voltage Vc02.
3. a kind of twin-stage three-phase energy accumulation current converter according to claim 1, it is characterised in that the DC/DC conversion modules are also
Including the first filter inductance (109) and the second filter inductance (110), the positive terminal of first storage bodies (111) passes through first
Filter inductance (109) connects the 5th power switch pipe (105) and the 7th power switch pipe (107), second storage bodies respectively
(112) negative pole end takes back the low-voltage output end of AC/DC conversion modules by the second filter inductance (110)；First filtered electrical
Sense (109) and the second filter inductance (110) limit the mutation of electric current for smoothing current waveform.
4. a kind of twin-stage three-phase energy accumulation current converter according to claim 1, it is characterised in that power switch pipe be IGBT or
Person MOSFET.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160537A (en) * | 2016-08-10 | 2016-11-23 | 江苏林洋能源股份有限公司 | Twin-stage three-phase energy accumulation current converter and control method thereof and control system |
| CN109274165A (en) * | 2018-11-13 | 2019-01-25 | 珠海泰通电气技术有限公司 | A kind of fast charging and discharging energy-storage system of large capacity |
| CN113489326A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Two-stage DC/AC bidirectional conversion device applied to energy router |
| CN117811052A (en) * | 2024-02-29 | 2024-04-02 | 京清数电(北京)技术有限公司 | Control method and system of energy storage converter, electronic equipment and storage medium |
-
2016
- 2016-08-10 CN CN201620865505.9U patent/CN206060575U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160537A (en) * | 2016-08-10 | 2016-11-23 | 江苏林洋能源股份有限公司 | Twin-stage three-phase energy accumulation current converter and control method thereof and control system |
| CN106160537B (en) * | 2016-08-10 | 2019-05-10 | 江苏林洋能源股份有限公司 | Twin-stage three-phase energy accumulation current converter and its control method and control system |
| CN109274165A (en) * | 2018-11-13 | 2019-01-25 | 珠海泰通电气技术有限公司 | A kind of fast charging and discharging energy-storage system of large capacity |
| CN113489326A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Two-stage DC/AC bidirectional conversion device applied to energy router |
| CN117811052A (en) * | 2024-02-29 | 2024-04-02 | 京清数电(北京)技术有限公司 | Control method and system of energy storage converter, electronic equipment and storage medium |
| CN117811052B (en) * | 2024-02-29 | 2024-05-07 | 京清数电(北京)技术有限公司 | Control method and system of energy storage converter, electronic equipment and storage medium |
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