CN106899030B - A kind of primary side integrated modular independent control battery energy storage system - Google Patents
A kind of primary side integrated modular independent control battery energy storage system Download PDFInfo
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- CN106899030B CN106899030B CN201710232424.4A CN201710232424A CN106899030B CN 106899030 B CN106899030 B CN 106899030B CN 201710232424 A CN201710232424 A CN 201710232424A CN 106899030 B CN106899030 B CN 106899030B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of primary side integrated modular independent control battery energy storage systems, and the battery energy storage system includes battery unit, are made of concatenated multiple groups battery module；Main power inverter, for controlling the principal current of battery unit, main power inverter and battery units in parallel, and main power inverter accesses three-phase AC grid；And auxiliary power conversion, it is connect with multiple groups battery module and closed loop independent control is carried out to every group of battery module respectively, for controlling the charging and discharging currents of every group of battery module and the difference of principal current.The present invention is independently controlled the difference currents part of battery module by main power inverter and auxiliary power conversion realization, without being independently controlled to all batteries electric current, and primary side is using integrated simplex winding structure, reduce the loss and cost of current transformer, and improves the capacity usage ratio of battery module.
Description
Technical field
The present invention relates to energy-storage system field and converters fields, and in particular, to a kind of primary side is integrated
Formula modularization independent control battery energy storage system.
Background technique
As environment and energy problem become focus in the world, renewable energy power generation has been developed as intelligence
The important motivity of power grid, intermittent and fluctuation have an impact network voltage frequency etc..Wherein, battery energy storage system due to
Have the function of to alleviate power swing, optimization power grid quality of intermittent power supply etc. and be concerned.
Fig. 1 is traditional battery energy storage system schematic diagram.As shown in Figure 1, up to a hundred single batteries are concentrated series connection, and adopt
It is grid-connected with concentrated high power converter.Due between single battery SOC (carrying capacity), capacity, internal resistance etc. there are inconsistency,
A large amount of series connection applications reduce battery capacity and capacity usage ratio, the lost of life.
Fig. 2 is existing module electrochemical cell energy-storage system schematic diagram.As shown in Fig. 2, general in groups according to battery modularized flexibility
It reads, the extensive series-connected cell group in conventional batteries energy-storage system is divided into several A-battery modules, each battery module
Energy-storage module is constituted by power inverter, then accesses power grid by different connection types, constitutes flexible energy-storage system in groups.
Existing modular battery energy-storage system generallys use total power independent control type energy-storage system.Total power is independently controlled
Type flexibility processed in groups energy-storage system there are mainly three types of structure: one, H bridge cascade connection type flexibility energy-storage system in groups, using three-phase alternating current
Export structure, each submodule DC side are mutually independent battery module, are generated after respective H bridge DC/AC converter low
Alternating voltage is pressed, grid-connected required alternating voltage is generated after module-cascade, accesses three-phase AC grid.When battery module charge and discharge
Whole power are converted and are controlled by H bridge, and the cost, volume, loss of current transformer is caused to increase with general power, in low electricity
Efficiency is lower when pressing applications.Two, modular multi-level converter (MMC, modular-multilevel-converter)
Battery energy storage system, the total power that energy-storage battery module also may be implemented while realizing AC and DC power grid power transmission are only
Vertical control.Include DC component, first harmonic component and second harmonic component in submodule electric current, causes module switch device electric
Stream stress is big, and on-state loss is larger.Cost, the volume of current transformer increase with general power, are not suitable for middle low-voltage applications.
Three, DC-DC cascade connection type flexibility energy-storage system in groups, is cascaded by N number of identical DC-DC type energy-storage module, be may be constructed
Individual DC energy storage system, accesses intermediate dc bus or DC grid, can also be accessed and be handed over by traditional grid-connected converter
Galvanic electricity net.DC-DC converter structure is simple, control is simple, high reliablity, and AC compounent, switching device current stress is not present
It is cascaded lower than H bridge, system effectiveness is higher.But module total power is by DC-DC converter, switching tube flows through whole electric currents, absolutely
It is larger to being lost；Cost, the volume of DC-DC converter increase with general power, account for larger proportion in systems.
In the above existing total power independent control type flexibility in groups energy-storage system, no matter current difference size, battery
Whole charging and discharging currents of module will flow through respective converter switches device, cause device current stress it is big, it is at high cost, lead
Logical loss is big, and with the increase of power system capacity, problem is more prominent.Usually in the case where reasonable disposition battery capacity, each electricity
Substantially in a certain range, even echelon utilizes battery, capacity volume variance will not be too big, required charge and discharge for pond module capacity
Electric current there will not be too many differences, therefore be not necessarily to be independently controlled all batteries electric current, and only need to its middle part
The difference currents divided are controlled, so that it may realize the raising of battery module capacity usage ratio.
Summary of the invention
In view of the foregoing, it is an object to provide a kind of primary side integrated modular independent control battery energy storage system
System, to solve existing total power type Modular Flexible in groups in energy-storage system, switching device flows through whole charge and discharges of battery module
Electric current, and lead to the problem that device current stress is big, at high cost and big conduction loss.
To achieve the goals above, the invention adopts the following technical scheme:
Primary side integrated modular independent control battery energy storage system of the present invention, comprising:
Battery unit, including concatenated multiple groups battery module；
Main power inverter, with battery units in parallel, for controlling the principal current of battery unit, and main power inverter is connect
Enter three-phase AC grid；And
Auxiliary power conversion connect with multiple groups battery module and carries out closed loop to every group of battery module respectively and independently controls
System, for controlling the charging and discharging currents of every group of battery module and the difference of the principal current.
Preferably, the main power inverter includes:
First capacitor device, with battery units in parallel；And
For first switch tube to the 6th switching tube, each switching tube distinguishes one diode of inverse parallel, first switch tube connection
Between the first end of the first inductor and the anode of battery unit, second switch be connected to the first end of the first inductor with
Between the cathode of battery unit, third switching tube is connected between the first end of the second inductor and the anode of battery unit, the
Four switching tubes are connected between the first end of the second inductor and the cathode of battery unit, and the 5th switching tube is connected to third inductance
Between the first end of device and the anode of battery unit, the 6th switching tube is connected to the first end and battery unit of third inductor
Between cathode, the second end of the first inductor, the second inductor and third inductor is respectively connected to a phase of three-phase AC grid.
Preferably, the auxiliary power conversion includes:
Primary side integrated form high-frequency isolation transformer, the primary side integrated form high-frequency isolation transformer include an integrated primary side
Winding and multiple vice-side windings；
Primary side converter is connect with integrated primary side winding；And
Multiple pair sides converter, each vice-side winding are correspondingly connected with by each secondary side converter with every group of battery module.
Further, it is preferable to, the primary side converter includes:
7th switching tube to the tenth switching tube, each switching tube distinguish one diode of inverse parallel, the connection of the 7th switching tube
Between the first terminal of integrated primary side winding and the anode of battery unit, the 8th switching tube is connected to the of integrated primary side winding
Between one terminal and the cathode of battery unit, the 9th switching tube is connected to the Second terminal and battery unit of integrated primary side winding
Between anode, the tenth switching tube is connected between the Second terminal of integrated primary side winding and the cathode of battery unit.
As it is another preferably, the primary side converter includes:
7th switching tube, one diode of inverse parallel, the 7th switching tube are connected to the first end of integrated primary side winding
Between son and the anode of battery unit；
8th switching tube, one diode of inverse parallel, the 8th switching tube are connected to the first end of integrated primary side winding
Between son and the cathode of battery unit；
Second capacitor is connected between the Second terminal of integrated primary side winding and the anode of battery unit；And
Third capacitor is connected between the Second terminal of integrated primary side winding and the cathode of battery unit.
Preferably, the secondary side converter includes:
11st switching tube to the 14th switching tube, each switching tube difference one diode of inverse parallel, the described 11st
The first end of switching tube is connected to the anode of battery module, and the second end of the 11st switching tube is connected by the 4th inductor
The of vice-side winding is connected to by the 4th inductor in the first end of the first terminal of vice-side winding, the 12nd switching tube
One terminal, the second end of the 12nd switching tube are connected to the cathode of battery module, and the 13rd switching tube is connected to pair
Between the Second terminal of side winding and the anode of battery module, the 14th switching tube is connected to the Second terminal of vice-side winding
Between the cathode of battery module；And
4th capacitor, it is in parallel with battery module.
As it is another preferably, the pair side converter includes:
11st switching tube, one diode of inverse parallel, the first end of the 11st switching tube are connected to battery module
Anode, the second end of the 11st switching tube is connected to the first terminal of vice-side winding by the 4th inductor；
The first end of 12nd switching tube, one diode of inverse parallel, the 12nd switching tube passes through the 4th inductor
It is connected to the first terminal of vice-side winding, the second end of the 12nd switching tube is connected to the cathode of battery module；
4th capacitor, it is in parallel with battery module；
5th capacitor is connected between the Second terminal of vice-side winding and the anode of battery module；And
6th capacitor is connected between the Second terminal of vice-side winding and the cathode of battery module.
Preferably, the main power inverter passes through one in vector controlled, active power and reactive power decoupling control
Kind control principal current, wherein vector controlled includes in sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM)
It is a kind of.
Preferably, the auxiliary power conversion controls the difference by phase shifting control strategy, the phase shift
Control strategy include two-track phase and three phase shifts in bridge between phase shift system between bridge, extension phase shift system, bridge, pulsewidth modulation (PWM) plus
One of phase shifting control, triangular modulation and trapezoid modulation are a variety of.
Preferably, the primary side converter is connect with battery unit or the primary side converter connects with external dc power
It connects.
Compared with prior art, the present invention has the following advantages and beneficial effects:
In the present invention, main power inverter undertakes most of power, controls the principal current of battery unit, improves complete machine effect
Rate；Auxiliary power conversion controls the difference section between battery module charging and discharging currents and principal current, is suitable for multiple groups battery
The inconsistency of module improves battery unit capacity usage ratio, and auxiliary power conversion control power is small, is absolutely lost
It is small；Main power inverter is simultaneously operable with auxiliary power conversion, can also be worked, is independent of each other respectively；
Compared with the two-way full-bridge converter structure of conventional symmetrical formula of each secondary corresponding primary side in side, the present invention is using more
A pair side shares the transformer device structure of a primary side, and cost, loss, volume, weight all reduce half therewith；Primary side power is institute
Primary side power can be ignored after having the sum of secondary side power, the secondary positive negative power in side to offset；
It is high-power present invention may apply in, medium voltate grade, more demanding to efficiency, cost and capacity usage ratio
Energy-storage system application.
Detailed description of the invention
Fig. 1 is traditional battery energy storage system schematic diagram；
Fig. 2 is existing module electrochemical cell energy-storage system schematic diagram；
Fig. 3 is the main circuit diagram of battery energy storage system preferred embodiment of the present invention；
Fig. 4 is the main circuit diagram of another embodiment of battery energy storage system of the present invention；
Fig. 5 is battery energy storage system preferred embodiment original secondary voltage waveform diagram of the present invention；
Fig. 6 is battery energy storage system preferred embodiment transformer primary side equivalent circuit diagram of the present invention.
Specific embodiment
Embodiment of the present invention described below with reference to the accompanying drawings.Those skilled in the art may recognize that
It arrives, it without departing from the spirit and scope of the present invention, can be with a variety of different modes or combinations thereof to described
Embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than the protection for limiting claim
Range.In addition, in the present specification, identical appended drawing reference indicates identical part.
Fig. 3 is the main circuit diagram of battery energy storage system preferred embodiment of the present invention, as shown in figure 3, of the present invention
Battery energy storage system, comprising:
Battery unit 100, wherein battery unit 100 includes concatenated multiple groups battery module 110；
Main power inverter 200, in parallel with battery unit 100, main power inverter 200 is for controlling battery unit 100
Principal current, and main power inverter 200 access three-phase AC grid, wherein principal current refers to all battery module electric currents
Same section；And
Auxiliary power conversion 300 is connect with multiple groups battery module 110, for the charge and discharge to each group battery module 110
The difference of electric current and principal current carries out closed loop control, wherein the difference of charging and discharging currents and principal current is preferably principal current
10%-20% so that each battery module is worked in optimum state to adapt to the otherness between different battery modules, electricity
The switching device for only having fraction electric current to correspond to power inverter by each battery module in the module of pond reduces device current stress
With conduction loss, reduce cost, realize the raising of battery module capacity usage ratio；
Principal current and difference current are controlled respectively by main power inverter 200 and auxiliary power conversion 300, thus
It realizes the independent control to 110 charging and discharging currents of battery module, improves the capacity usage ratio of battery module 110.
Wherein, battery module 110 can use new production various types battery, can also be used in other systems and move back fortune electricity
Pond or disparate modules are using the mixing application of different type battery, to realize that moving back the echelon for transporting battery utilizes, and gives full play to battery
The surplus value is conducive to environmental protection and economizes on resources, and battery module 110 is preferably A-battery module.
As shown in figure 3, main power inverter 200 is preferably gird-connected inverter structure, comprising:
First capacitor device 210, preferably HF filtering capacitor in parallel with battery unit 100；And
First switch tube Q1 to the 6th switching tube Q6, and each switching tube distinguishes one diode 220 of inverse parallel,
Wherein, first switch tube Q1 is connected between the first end of the first inductor 230 and the anode of battery unit 100,
Specifically, the first end of first switch tube Q1 is connected to the first end of the first inductor 230, and the second end of first switch tube Q1
It is connected to the anode of battery unit 100；
Second switch Q2 is connected between the first end of the first inductor 230 and the cathode of battery unit 100, specifically
Ground, the second end of second switch Q2 is connected to the first end of the first inductor 230, and the first end of second switch Q2 connects
To the cathode of battery unit 100；
Third switching tube Q3 is connected between the first end of the second inductor 240 and the anode of battery unit 100, specifically
Ground, the first end of third switching tube Q3 is connected to the first end of the second inductor 240, and the second end of third switching tube Q3 connects
To the anode of battery unit 100；
4th switching tube Q4 is connected between the first end of the second inductor 240 and the cathode of battery unit 100, specifically
Ground, the second end of the 4th switching tube Q4 is connected to the first end of the second inductor 240, and the first end of the 4th switching tube Q4 connects
To the cathode of battery unit 100；
5th switching tube Q5 is connected between the first end of third inductor 250 and the anode of battery unit 100, specifically
Ground, the first end of the 5th switching tube Q5 is connected to the first end of third inductor 250, and the second end of the 5th switching tube Q5 connects
To the anode of battery unit 100；
6th switching tube Q6 is connected between the first end of third inductor 250 and the cathode of battery unit 100, specifically
Ground, the second end of the 6th switching tube Q6 is connected to the first end of third inductor 250, and the first end of the 6th switching tube Q6 connects
To the cathode of battery unit 100；
The second end of first inductor 230, the second inductor 240 and third inductor 250 is respectively connected to three-phase alternating current
One phase u of netC、uB、uA。
Preferably, first switch tube Q1 to the 6th switching tube Q6 can be insulated gate bipolar transistor (IGBT,
Insulated Gate Bipolar Transistor), at this point, the first end of first switch tube Q1 to the 6th switching tube Q6 can
To be the collector terminal of IGBT, and the second end of first switch tube Q1 to the 6th switching tube Q6 can be the emitter terminal of IGBT
Son.
Main power inverter 200 is by one of vector controlled, active power and reactive power decoupling control to main electricity
Stream is controlled, wherein one of SPWM and SVPWM can be selected in vector controlled.
In battery energy storage system of the present invention, when input side uses the non-isolated connection type of serial or parallel connection,
Since outlet side is also cascade, for the generation for preventing circulation, need to be isolated between auxiliary power conversion input and output.Auxiliary
Power inverter 300 can respectively correspond the transformer configuration form of an integrated primary side winding using each vice-side winding,
The transformer configuration form of an integrated primary side winding can be shared using multiple vice-side windings.
Preferably, auxiliary power conversion 300 of the invention using multiple vice-side windings 312 share an integrated primary side around
The primary side integrated form high-frequency isolation transformer 310 of group 311, makes cost, loss, volume, weight all reduce half therewith, primary side is adopted
With integrated simplex winding structure, auxiliary power conversion cost and loss can reduce, improve the efficiency of battery energy storage system.Auxiliary
Power inverter 300 is by introducing phase shifting control strategy to the charging and discharging currents of each group battery module 110 and the difference of principal current
Carry out closed loop independent control, wherein phase shifting control strategy includes two-track in bridge between phase shift system, extension phase shift system, bridge between bridge
Mutually and three phase shifts, PWM add one of phase shifting control, triangular modulation and trapezoid modulation or a variety of.
Auxiliary power conversion 300 includes:
Primary side integrated form high-frequency isolation transformer 310, including an integrated primary side winding 311 and multiple vice-side windings 312；
Primary side converter 320 is connect with integrated primary side winding 311；And
Multiple pair sides converter 330, each vice-side winding 312 pass through each secondary side converter 330 and every group of battery module
110 are correspondingly connected with, and realize the closed loop independent control to the difference of 110 charging and discharging currents of each group battery module and principal current.
On the basis of the principal current of battery unit 100, between 110 charging and discharging currents of each group battery module and principal current
Difference currents have just have it is negative, so the preferably bidirectional isolation DC-DC converter of auxiliary power conversion 300.
As shown in figure 3, two-way isolation DC-DC converter can be two-way full-bridge converter structure.Primary side converter 320 can
To be full-bridge converter structure, including the 7th switching tube Q7 to the tenth switching tube Q10, and each switching tube distinguishes inverse parallel one
A diode 220.
Wherein, the 7th switching tube Q7 is connected to the first terminal of integrated primary side winding 311 and the anode of battery unit 100
Between, specifically, the first end of the 7th switching tube Q7 is connected to the first terminal of integrated primary side winding 311, and the 7th switching tube Q7
Second end be connected to the anode of battery unit 100；
8th switching tube Q8 is connected between the first terminal of integrated primary side winding 311 and the cathode of battery unit 100, tool
Body, the second end of the 8th switching tube Q8 are connected to the first terminal of integrated primary side winding 311, and the first of the 8th switching tube Q8
End is connected to the cathode of battery unit 100；
9th switching tube Q9 is connected between the Second terminal of integrated primary side winding 311 and the anode of battery unit 100, tool
Body, the first end of the 9th switching tube Q9 are connected to the Second terminal of integrated primary side winding 311, and the second of the 9th switching tube Q9
End is connected to the anode of battery unit 100；
Tenth switching tube Q10 is connected between the Second terminal of integrated primary side winding 311 and the cathode of battery unit 100,
Specifically, the second end of the tenth switching tube Q10 is connected to the Second terminal of integrated primary side winding 311, and the tenth switching tube Q10
First end is connected to the cathode of battery unit 100.
As shown in figure 3, secondary side converter 330 can be full-bridge converter structure.Secondary side converter 330 includes:
4th capacitor 331, it is in parallel with battery module 110；And
11st switching tube S1 to the 14th switching tube S4, the pipe that each opens the light distinguish one diode 220 of inverse parallel.
Wherein, the first end of the 11st switching tube S1 is connected to the anode of battery module 110, and the 11st switching tube S1
Second end is connected to the first terminal of vice-side winding 312 by the 4th inductor 334；
The second end of 12nd switching tube S2 is connected to the cathode of battery module 110, and the first of the 12nd switching tube S2
End is connected to the first terminal of vice-side winding 312 by the 4th inductor 334；
13rd switching tube S3 is connected between the Second terminal of vice-side winding 312 and the anode of battery module 110, specifically
Ground, the first end of the 13rd switching tube S3 is connected to the anode of battery module 110, and the second end of the 13rd switching tube S3 connects
To the Second terminal of vice-side winding 312；
14th switching tube S4 is connected between the Second terminal of vice-side winding 312 and the cathode of battery module 110, specifically
Ground, the second end of the 14th switching tube S4 is connected to the cathode of battery module 110, and the first end of the 14th switching tube S4 connects
To the Second terminal of vice-side winding 312.
Fig. 4 is the main circuit diagram of another embodiment of battery energy storage system of the present invention, as shown in figure 4, primary side converts
Device 320 can be half bridge converter structure, comprising:
7th switching tube Q7, one diode 220 of inverse parallel, the 7th switching tube Q7 are connected to integrated primary side winding 311
Between first terminal and the anode of battery unit 100, specifically, the first end of the 7th switching tube Q7 is connected to integrated primary side winding
311 first terminal, and the second end of the 7th switching tube Q7 is connected to the anode of battery unit 100；
8th switching tube Q8, one diode 220 of inverse parallel, the 8th switching tube Q8 are connected to integrated primary side winding 311
Between first terminal and the cathode of battery unit 100, specifically, the second end of the 8th switching tube Q8 is connected to integrated primary side winding
311 first terminal, and the first end of the 8th switching tube Q8 is connected to the cathode of battery unit 100；
Second capacitor 321 is connected between the Second terminal of integrated primary side winding 311 and the anode of battery unit 100；
And
Third capacitor 322 is connected between the Second terminal of integrated primary side winding 311 and the cathode of battery unit 100.
As shown in figure 4, secondary side converter 330 can be half bridge converter structure.Secondary side converter 330 includes:
4th capacitor 331, it is in parallel with battery module 110；
5th capacitor 332 is connected between the Second terminal of vice-side winding 312 and the anode of battery module 110；
6th capacitor 333 is connected between the Second terminal of vice-side winding 312 and the cathode of battery module 110；
The first end of 11st switching tube S1, the 220, the 11st switching tube S1 of one diode of inverse parallel are connected to battery mould
The anode of block 110, and the second end of the 11st switching tube S1 is connected to the first of vice-side winding 312 by the 4th inductor 334
Terminal；And
The second end of 12nd switching tube S2, the 220, the 12nd switching tube S2 of one diode of inverse parallel are connected to battery mould
The cathode of block 110, and the first end of the 12nd switching tube S2 is connected to the first of vice-side winding 312 by the 4th inductor 334
Terminal.
Preferably, the 7th switching tube Q7 to the tenth switching tube Q10 can be IGBT, at this point, the 7th switching tube Q7 to the tenth
The first end of switching tube Q10 can be the collector terminal of IGBT, and the second end of the 7th switching tube Q7 to the tenth switching tube Q10
It can be the emitter terminal of IGBT.
Preferably, it is brilliant to can be Metal-Oxide Semiconductor field-effect by the 11st switching tube S1 to the 14th switching tube S4
Body pipe (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor), at this point, the 11st opens
The first end for closing pipe S1 to the 14th switching tube S4 can be the drain terminal of MOSFET, and the 11st switching tube S1 to the 14th
The second end of switching tube S4 can be the source terminal of MOSFET.
Primary side converter 320 and secondary side converter 330 can use foregoing full-bridge converter structure (such as simultaneously
Shown in Fig. 3), half bridge converter structure (as shown in Figure 4) can also be used simultaneously, it can also be with primary side converter 320 using complete
Bridge converter structure, multiple pair sides converter 330 are adopted using full-bridge and half-bridge hybrid combination or primary side converter 320
With half bridge converter structure, multiple pair sides converter 330 uses full-bridge and half-bridge mixed structure.That is transformer primary side high frequency is inverse
The full-bridge circuit that power transformation road can be constituted for four switching tubes, or two switching tubes and two DC capacitors are constituted
Half-bridge inversion circuit, transformer secondary circuit can for four switching tubes constitute full-bridge circuit, or two
The semi-bridge alternation circuit that switching tube and two DC capacitors are constituted.
Preferably, the DC side of primary side converter 320 can access battery energy storage system internal cell as previously described
100 both ends can also access other external dc power supply both ends.
Below by taking bi-directional DC-DC full-bridge converter phase shifting control as an example, this hair is described in detail in conjunction with Fig. 3, Fig. 5 and Fig. 6
The working principle of the bright battery energy storage system.
Fig. 5 and Fig. 6 is battery energy storage system preferred embodiment original secondary voltage waveform diagram of the present invention, transformer respectively
Primary side equivalent circuit diagram.
A point voltage in Fig. 6 can be obtained by superposition theorem are as follows:
In formula (1), vAFor A point voltage, vpFor primary voltage of transformer, LpFor transformer primary side leakage inductance, v1,v2,……,vN
Respectively transformer secondary voltage, v '1,v’2,……,v’NEquivalent voltage for the conversion of transformer secondary voltage to primary side, Ls1,
Ls2,……,LsNFor the sum of each winding leakage inductance in secondary side and outer coilloading, Ls1’,Ls2’,……,LsN' it is that the equivalent of primary side is arrived in conversion
Inductance.
Assuming that Ls1'=Ls2'=Ls3'=...=LsN'=Ls, and use ei(i=0,1,2 ..., N) replaces (1)
Middle items fraction, then:
e2=...=eN=e1
Therefore it can obtain:
vA=vp×e0+v'1×e1+v'2×e2+......+v'N×en
=vp×e0+(v'2+v'3+......+v'N)×e1,
......
In formula, ipFor primary side current of transformer, iLs1, iLs2... ..., iLsNFor transformer secondary side current, i1', i2' ... ...,
iN' it is equivalent current of the transformer secondary side current conversion to primary side.
The electric current conversion on transformer each group pair side can be obtained to the electric current i of primary side by above formula1' to iN', it is therefore apparent that
i1' electric current not only by vpAnd v '1It determines, is also determined by other secondary voltages, therefore there is also coupled relations between each secondary side.
In order to achieve the purpose that the difference currents of each battery module of independent control, need to decouple multiple groups pair side.
It is now assumed that Ls> > Lp, i.e., when the equivalent inductance on every group pair side is much larger than primary side leakage inductance, then obtain:
Therefore
......
The secondary current i of primary side is arrived in each conversion1', i2' ... ..., iN' it is all by integrating original edge voltage, eiRespectively conversion
The equivalent inductance of secondary voltage and respective secondary side conversion to primary side to primary side is determined, is independent from each other, to know
The difference currents of each module are also independent from each other.By adding auxiliary phase shift inductance outside each vice-side winding, make each pair
Side equivalent inductance is much larger than primary side inductance, and the closed loop independent control to the difference currents of multiple battery modules may be implemented.IM1For
Main power inverter DC side exports electric current, IMFor the principal current of all series-connected battery modules, IB1, IB2... ..., IBNIt is each
Battery module charging and discharging currents, Id1, Id2... ..., IdNDifference electricity between principal current and each battery module charging and discharging currents
Stream.
If Pdi(i=1,2 ... ..., N) is that the part of i-th of battery module controls power, i.e. function corresponding to difference currents
Rate, PsΣFor the sum of the total variances power of N number of battery module.According to the two-way each electricity of full-bridge converter output power formula
The differing power of pond module are as follows:
Pd2=vd2Id2,
......
PdN=vdNIdN
Wherein:
In formula, vd1,vd2,……,vdNFor N number of series-connected battery modules voltage, Id1,Id2... ..., IdNFor principal current and each
Difference currents between battery module charging and discharging currents, NTFor transformer turn ratio, T is the time of half of switch periods, and f is to open
Close the switching frequency of pipe, D1For phase shift duty ratio,The respectively pulse of primary side converter switches pipe and multiple secondary sides
The phase difference of converter switches pipe pulse.
Enable vd1=vd2=...=vdN, according to power conservation law it is found that primary side inverter power PpBecome equal to secondary side
The sum of parallel operation differing power.
Pp=PsΣ=Pd1+Pd2+...+Pdn
=vd1Id1+vd2Id2+...+vdNIdN
=vd1(Id1+Id2+...+IdN)
vdpFor primary side DC voltage, it is equal to the sum of all battery module voltages, then primary side converter DC side electric current Idp
Are as follows:
Make the principal current I of battery unit by reasonably optimizing controlMFor the average current of all battery currents, then Id1,
Id2... ..., IdNEtc. difference currents have just and have negative, difference currents are made after positive and negative counteracting and for 0, can be obtained
Due to IdpIt is 0, then integrating primary side power is also almost 0, and primary side converter cost, loss also decrease.
Therefore battery energy storage system may be implemented by rationally giving control current value in the Partial Power independent control energy-storage system
The control power of system auxiliary power conversion substantially reduces, and absolutely loss reduces.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of primary side integrated modular independent control battery energy storage system characterized by comprising
Battery unit, the battery unit include concatenated multiple groups battery module；
Main power inverter, the main power inverter and the battery units in parallel, for controlling the master of the battery unit
Electric current, the main power inverter access three-phase AC grid, and the principal current refers to the same section of all battery module electric currents；
And
Auxiliary power conversion connect with multiple groups battery module and carries out closed loop independent control to every group of battery module respectively, uses
In the difference for the charging and discharging currents and the principal current for controlling every group of battery module；
Wherein, the main power inverter includes:
First capacitor device, with the battery units in parallel；And
First switch tube to the 6th switching tube, each switching tube of the first switch tube to the 6th switching tube distinguishes inverse parallel one
A diode, first switch tube are connected between the first end of the first inductor and the anode of the battery unit, second switch
Pipe is connected between the first end of the first inductor and the cathode of the battery unit, and third switching tube is connected to the second inductor
First end and the battery unit anode between, the 4th switching tube be connected to the second inductor first end and the battery
Between the cathode of unit, the 5th switching tube is connected between the first end of third inductor and the anode of the battery unit, the
Six switching tubes are connected between the first end of third inductor and the cathode of the battery unit, the first inductor, the second inductance
The second end of device and third inductor is respectively connected to a phase of the three-phase AC grid；
The auxiliary power conversion includes:
Primary side integrated form high-frequency isolation transformer, the primary side integrated form high-frequency isolation transformer include an integrated primary side winding
With multiple vice-side windings；
Primary side converter is connect with the integrated primary side winding；And
Multiple pair sides converter, each vice-side winding are correspondingly connected with by each secondary side converter with every group of battery module.
2. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Primary side converter includes:
Each switching tube of 7th switching tube to the tenth switching tube, the 7th switching tube to the tenth switching tube distinguishes inverse parallel one
A diode, the 7th switching tube are connected between the first terminal of the integrated primary side winding and the anode of the battery unit,
8th switching tube is connected between the first terminal of the integrated primary side winding and the cathode of the battery unit, the 9th switching tube
It is connected between the Second terminal of the integrated primary side winding and the anode of the battery unit, the tenth switching tube is connected to described
Between the Second terminal of integrated primary side winding and the cathode of the battery unit.
3. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Primary side converter includes:
7th switching tube, described 7th switching tube inverse parallel, one diode, the 7th switching tube are connected to the integrated original
Between the first terminal of side winding and the anode of the battery unit；
8th switching tube, described 8th switching tube inverse parallel, one diode, the 8th switching tube are connected to the integrated original
Between the first terminal of side winding and the cathode of the battery unit；
Second capacitor is connected between the Second terminal of the integrated primary side winding and the anode of the battery unit；And
Third capacitor is connected between the Second terminal of the integrated primary side winding and the cathode of the battery unit.
4. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Secondary side converter includes:
11st switching tube to the 14th switching tube, each switching tube difference of the 11st switching tube to the 14th switching tube
One diode of inverse parallel, the first end of the 11st switching tube are connected to the anode of battery module, the 11st switch
The second end of pipe is connected to the first terminal of the vice-side winding, the first end of the 12nd switching tube by the 4th inductor
The first terminal of the vice-side winding is connected to by the 4th inductor, the second end of the 12nd switching tube is connected to battery
The cathode of module, the 13rd switching tube are connected between the Second terminal of the vice-side winding and the anode of battery module,
14th switching tube is connected between the Second terminal of the vice-side winding and the cathode of battery module；And
4th capacitor, it is in parallel with the battery module.
5. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Secondary side converter includes:
The first end of 11st switching tube, described 11st switching tube inverse parallel, one diode, the 11st switching tube connects
The anode in battery module is connect, the second end of the 11st switching tube is connected to the vice-side winding by the 4th inductor
First terminal；
The first end of 12nd switching tube, described 12nd switching tube inverse parallel, one diode, the 12nd switching tube is logical
The first terminal that the 4th inductor is connected to the vice-side winding is crossed, the second end of the 12nd switching tube is connected to battery mould
The cathode of block；
4th capacitor, it is in parallel with the battery module；
5th capacitor is connected between the Second terminal of the vice-side winding and the anode of the battery module；And
6th capacitor is connected between the Second terminal of the vice-side winding and the cathode of the battery module.
6. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Main power inverter controls the principal current by one of vector controlled, active power and reactive power decoupling control,
In, the vector controlled includes one of sinusoidal pulse width modulation and space vector pulse width modulation.
7. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Auxiliary power conversion controls the difference by phase shifting control strategy, and the phase shifting control strategy includes phase shift between bridge
Mode, extension phase shift system, two-track phase and three phase shifts, pulsewidth modulation add phase shifting control, triangular modulation and trapezoidal in bridge between bridge
One of wave modulation is a variety of.
8. primary side integrated modular independent control battery energy storage system according to claim 1, which is characterized in that described
Primary side converter is connect with the battery unit or the primary side converter is connect with external dc power.
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| CN107769389B (en) * | 2017-10-24 | 2023-08-22 | 华南理工大学 | Battery energy storage system of isolation symmetrical series flyback circuit |
| CN107706934B (en) * | 2017-10-24 | 2023-07-18 | 华南理工大学 | Bidirectional forward battery energy storage system based on resonance demagnetization |
| CN107834581A (en) * | 2017-10-24 | 2018-03-23 | 华南理工大学 | A kind of battery energy storage system of Multiple coil resonance separate current control |
| CN107769390B (en) * | 2017-10-30 | 2024-01-23 | 华南理工大学 | Independent current control battery energy storage system easy to expand and control method thereof |
| CN107681677B (en) * | 2017-10-30 | 2024-01-23 | 华南理工大学 | Bidirectional flyback primary side integrated battery energy storage system |
| CN107834582A (en) * | 2017-10-30 | 2018-03-23 | 华南理工大学 | A kind of battery energy storage system of double tube positive exciting multiport separate current control |
| CN109194130B (en) * | 2018-09-06 | 2020-11-17 | 南京南瑞继保电气有限公司 | Unidirectional direct-current voltage conversion device and system and control method thereof |
| CN109951089B (en) * | 2019-03-26 | 2020-12-15 | 哈工大（张家口）工业技术研究院 | Control method of single-phase quasi-single-stage AC-DC converter |
| CN112865528B (en) * | 2020-12-31 | 2022-02-11 | 北京交通大学 | Secondary pulse power decoupling method based on direct current bus voltage detection |
| CN113489041B (en) * | 2021-06-07 | 2023-07-14 | 南方电网调峰调频发电有限公司 | Modularized multi-level converter with energy storage function and control method thereof |
| CN118232484B (en) * | 2024-05-23 | 2024-08-27 | 西安图为电气技术有限公司 | DC energy storage device |
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