CN109256843A - A kind of dynamically reconfigurable battery energy storage system and its control method - Google Patents
A kind of dynamically reconfigurable battery energy storage system and its control method Download PDFInfo
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- CN109256843A CN109256843A CN201811382879.5A CN201811382879A CN109256843A CN 109256843 A CN109256843 A CN 109256843A CN 201811382879 A CN201811382879 A CN 201811382879A CN 109256843 A CN109256843 A CN 109256843A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of dynamically reconfigurable battery energy storage systems and its control method, comprising: energy storage subsystem, the inverter circuit of charge and discharge electrical interface and battery management subsystem；Energy storage subsystem includes X double half-bridge structure unit branches, and X is the integer more than or equal to 1；Double half-bridge structure units include two batteries and three controllable switches, the positive terminal of first battery is connected with the first controllable switch, the negative pole end of second battery with third controllable switch by being connected, one end of second controllable switch is connected between first battery and the series connection point of the first controllable switch, and the other end of the second controllable switch is connected between second battery and the series connection point of third controllable switch.The present invention can bypass the functions such as the charge and discharge work of fail battery, holding circuit without reducing number of switches on the basis of short circuit in realization, and control method is simple, easily executes.
Description
Technical field
The present invention relates to the building of battery energy storage system and control fields, more particularly to a kind of dynamically reconfigurable battery storage
It can system and its control method.
Background technique
In the research of various batteries, lithium battery is widely used since energy density is high and has extended cycle life.By
It is relatively low in the voltage of single battery, for providing the heavy loads such as motor and voltage for demands such as energy-storage systems is higher,
Therefore, it is necessary to use multiple battery groups to meet power requirement to reach certain voltage amplitude.Although this method is effective
Technological means, but can inevitably in appearance group different batteries parameter differences, such as state of charge (SOC, State of
Charge), hold voltage, electrochemical properties etc. that can be affected by a variety of factors, the difference as caused by process of production, in battery
Physical position, the self-discharge rate of battery and life time decay degree etc. in group, battery can also accelerate old between battery when working
Change process variances, reduce the actually available capacity and capacity usage ratio of battery pack, even whole service life, cause to be difficult into
The whole SOC appreciation of row battery pack.
Guarantee the utilization rate of energy to the validity for improving SOC balance strategy and reduces extra cost with great research
Meaning.In order to realize that cell flexible connects, increase circuit safety and serious forgiveness, it is necessary to add controllable switch in circuit.
However the addition of controllable switch can reduce the overall stability of circuit, then realize function and guarantee that circuit stability requires,
Realize the functions such as the charge and discharge work that can bypass fail battery, holding circuit without reducing number of switches on the basis of short circuit.It is existing
The number of switches of restructural battery pack in technology is more, control method is complicated, therefore needs that a kind of number of switches is few, control method
Simple battery energy storage technology.
Summary of the invention
The present invention provides a kind of dynamically reconfigurable battery energy storage systems, to solve the above problems.
To achieve the goals above, this invention takes following technical solutions.
An aspect of of the present present invention provides a kind of dynamically reconfigurable battery energy storage system characterized by comprising energy storage
Subsystem, the inverter circuit of charge and discharge electrical interface and battery management subsystem.
Energy storage subsystem includes X double half-bridge structure unit branches, and X is the integer more than or equal to 1；
Double half-bridge structure units include that two batteries and three controllable switches, the positive terminal of the first battery are controllably opened with first
It closes and is connected, for the negative pole end of the second battery by being connected with third controllable switch, one end of the second controllable switch is connected to described the
Between one battery and the series connection point of the first controllable switch, the other end of the second controllable switch is connected to second battery and third
Between the series connection point of controllable switch.
Further, when X is the integer greater than 1, the X double half-bridge structure unit branches are parallel with one another, and every
Double half-bridge structure unit branch routings are with 2nIn series for double half-bridge structure units of increased number, n is positive integer.
Further, the quantity of double half-bridge structure unit branches is calculated according to overall level quantity in battery energy storage system.
Further, battery management subsystem includes data acquisition module, state computation module, switch motion control module
Module occurs with pulse width modulation (PWM).
Data acquisition module is used to acquire the electric parameter of single battery；
State computation module, which is used to make real-time status according to the parameter of the single battery, to be determined；
The real-time status that switch motion control module is used to be made according to the state estimation module determines, determines output
Control information；
PWM occurs module and is used to be exported according to half-wave step type SPWM wave, generates pulse to control output.
Further, charge and discharge electrical interface inverter circuit includes dc-link capacitance, H bridge inverter, lc circuit and fundamental frequency
Transformer, the dc-link capacitance and H bridge inverter are in parallel, and the rear end of the H bridge inverter is equipped with transformer；It fills
The interface inverter circuit that discharges is used to be charged and discharged the battery energy storage system.
Further, the dynamic duty selection scheme of double half-bridge structure units includes: that the first battery is connected into system main branch,
And the second cell bypass；Or second battery be connected into system main branch, and the first cell bypass；Or first battery and the second battery all
It is connected into system main branch.
Further, two batteries in double half-bridge structure units cannot be bypassed by controllable switch simultaneously.
Further, battery management subsystem further includes that failure cuts relay, is guaranteed for fault-safety principle, and excision is
The fail battery monomer known.
Another aspect provides the control methods of dynamically reconfigurable battery energy storage system, comprising:
The parameter of data collecting module collected battery in battery management subsystem, and parametric results are transferred to state and are estimated
Module is counted, state computation module, which is used to make real-time status according to the parameter of the single battery, to be determined, switch motion control
Module is constructed according to the judgement, the real-time action topology of the control information and double half-bridge structure units that determine output,
PWM occurs module and is exported according to half-wave step type SPWM wave, generates pulse to control output, passes through charge and discharge electrical interface inverter electricity
Road performs battery charging or discharges.
The root of the present invention it can be seen from the technical solution that the dynamically reconfigurable battery energy storage system of aforementioned present invention provides
According in actual application, the extremely low feature of adjacent cell monomer simultaneous faults rate has formulated minimum concatenation unit, i.e., and double half
Bridge structural unit, is transformed battery energy storage system, adds simultaneously on the alternately battery of connection and the branch road of tandem tap
Connection switch is realizing the charge and discharge work that can bypass fail battery and holding circuit to form effective busbar voltage controllable branch path
Etc. functions without reducing number of switches on the basis of short circuit, compared with traditional reconfigurable topology, in the case of same battery quantity
Switch usage amount can be reduced, the performance of battery set management is improved；It is effective to control due to the presence of functional property interface circuit
Voltage magnitude on dc-link capacitance, becomes the key that AC or DC output waveform meets demand；Through the invention
Dynamically reconfigurable battery energy storage system control method controls battery system, and method is simple, easily performs.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 is the dynamically reconfigurable battery energy storage system schematic diagram of the embodiment of the present invention；
Fig. 2 is double half-bridge structure cellular construction schematic diagrams of the embodiment of the present invention；
Fig. 3 is double half-bridge structure element circuit figures of the embodiment of the present invention
Fig. 4 is the alternating link topology of battery in the prior art and controllable switch；
Fig. 5 is the circuit diagram that battery in the prior art is connected with the alternating of controllable switch；
Fig. 6 is the charge and discharge electrical interface inverter circuit diagram of the embodiment of the present invention；
Fig. 7 is the PWM analog sine waveforms figure of the embodiment of the present invention 2；
Fig. 8 is three branch circuit parallel connection figures of double half-bridge structure units of the embodiment of the present invention 2；
Appended drawing reference:
1 first 2 second controllable switch of controllable switch, 3 third controllable switch
4 first battery, 5 second battery
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refers to that there are the features, element and/or component, but it is not excluded that in the presence of or addition one or more other are special
Sign, element, component and/or their group.It should be understood that it can be straight when we claim element to be "connected" to another element
It is connected to other elements in succession, or there may also be intermediary elements.In addition, " connection " used herein may include wirelessly connecting
It connects.Wording "and/or" used herein includes one or more associated any cells for listing item and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
To be further explained by taking specific embodiment as an example below in conjunction with attached drawing convenient for the understanding of the present invention
It is bright.
The dynamically reconfigurable battery energy storage system of the embodiment of the present invention, it is intended to which realization can bypass fail battery and maintain electricity
The functions such as the charge and discharge work on road improve the performance of battery set management without reducing number of switches on the basis of short circuit.
Embodiment 1
Fig. 1 is the dynamically reconfigurable battery energy storage system schematic diagram of the embodiment of the present invention, comprising: energy storage subsystem, charge and discharge
The inverter circuit and battery management subsystem of electrical interface.
Energy storage subsystem includes X double half-bridge structure unit branches, and X is the integer more than or equal to 1.
Fig. 2 is that double half-bridge structure units of the embodiment of the present invention show that structure is intended to, and Fig. 3 is double half-bridges of the embodiment of the present invention
Structural unit circuit diagram, referring to Fig. 2 and Fig. 3, double half-bridge structure units include two batteries and three controllable switches, the first battery
Positive terminal be connected with the first controllable switch, by being connected with third controllable switch, second controllably opens the negative pole end of the second battery
One end of pass is connected between first battery and the series connection point of the first controllable switch, the other end connection of the second controllable switch
Between second battery and the series connection point of third controllable switch.
Preferably, when X is the integer greater than 1, the X double half-bridge structure unit branches are parallel with one another, and every double
Half-bridge structure unit branch is routed with 2nIn series for double half-bridge structure units of increased number, n is positive integer.
Preferably, the quantity of double half-bridge structure unit branches is calculated according to overall level quantity in battery energy storage system.Wherein,
The quantity of double half-bridge structure unit branches is overall level quantity 2nThe unit number n of exponential decrease, when the overall level quantity not
Meet 2nWhen, double half-bridge structure unit branches of composition preferentially guarantee being fully constructed for the branch of less element number.
Further, in the use of battery system, battery-controllable switch connection in the main branch of system can be led
Be divided into two classes: one kind is that battery in the prior art is connected with the alternating of controllable switch, and the second class is that battery-battery-is controllable
Switch is connect with battery-controllable switch alternating.Fig. 4 is the topology that battery in the prior art is connected with the alternating of controllable switch
Figure, Fig. 5 is the circuit diagram that battery in the prior art is connected with the alternating of controllable switch, referring to Fig. 4 and Fig. 5, wherein electricity
Pond connects topology with the alternating of controllable switch using battery cell as control unit, and work mutual independence between each control unit, electricity
Pond-battery-controllable switch connect with battery-controllable switch alternating topology using several battery cell groups as control unit, it is each
The control to work between mutually indepedent but unit internal cell by certain strategy between unit, herein can be by reality on basis
Cutback in demand number of switches, such as by using double half-bridge structure unit branches of the invention, two batteries are not when normal work
The 25% total controllable switch usage quantity that can be bypassed, but can cut down simultaneously on the basis of above two topology, cannot
The DC bus-bar voltage supplied is completed by the branch of other supply varying levels.Using identical number of batteries,
Other topological achievable level quantities reduce and switch usage quantity reduction, performance stabilization, control simply on year-on-year basis.
Preferably, battery management subsystem include data acquisition module, state computation module, switch motion control module and
Pulse width modulates (Pulse Width Modulation, PWM) and module occurs；
Data acquisition module is used to acquire the electric parameter of single battery；
State computation module, which is used to make real-time status according to the parameter of the single battery, to be determined；Work as system discharge
When, real-time judgment is carried out according to the external voltage of system, real-time judgment is carried out according to the SOC of battery cell when system charging.
The real-time status that switch motion control module is used to be made according to the state estimation module determines, determines output
Control information；
PWM occurs module and is used for according to half-wave step type Sinusoidal Pulse Width Modulation (Sinusoidal Pulse Width
Modulation, SPWM) wave output, pulse is generated to control output.
Schematically, the electric parameter for acquiring single battery includes external voltage, electric current and SOC etc., is controlled for switch motion
The movement that module occurs for module and PWM provides foundation, and instead of artificial acquisition and detecting step.
Further, the judgement that state computation module is made includes but is not limited to and external power switching requirement is made
Match, Optimal Decision-making exports branch in real time, realizes that the state of charge (SOC, State of Charge) between battery cell is balanced
Deng.Schematically, certain branch is selected as output branch, should be as far as possible by the SOC of single battery, cell health state in application
(State of Health, SOH) or the higher branch of external voltage are placed on stepped SPWM wave output period longer single order, give
Give more monomer task.In addition, if a certain energy-storage system is unable to satisfy the Power Exchange demand of external circuit, and two batteries are not
Half wave cycles missing when corresponding SPWM being caused to apply can be bypassed simultaneously, and output branch will be replaced suitable into level number
One, until all ladders for meeting half wave cycles are filled.
Further, single battery SOC and equalization operation strategy is executed when normal output voltage, there is abnormal i.e. block is
System output, schematically, cuts relay using failure and carries out block system output, guarantees as fault-safety principle, for cutting
Except known fail battery monomer.
Further, equalization operation strategy issues pwm control signal to controllable switch by taking output as an example, includes phase shift
PWM or carrier wave are superimposed PWM, and the higher battery of cell output voltage in double half-bridge structure units is made to participate in more outputs, or
According to the branch that the output power of interface circuit is able to satisfy, it is more to choose achievable level number, but is no more than its demand voltage
The branch that two times of amplitude.
Switch motion control module determines that the control information of output includes output voltage frequency and amplitude etc..Generally controlled
Circuit topology in the full-control types such as MOSFET that use of controllable switch, therefore, the pulse that PWM generating system generates only need to be via
Driving circuit or isolation, i.e., controllable controllable switch change topology to control output.
Further, the dynamic duty selection scheme of double half-bridge structure units includes: that the first battery is connected into system main branch,
And the second cell bypass；Or second battery be connected into system main branch, and the first cell bypass；Or first battery and the second battery all
It is connected into system main branch.
Further, Fig. 5 is the charge and discharge electrical interface inverter circuit diagram of the embodiment of the present invention, and referring to Fig. 5, which includes
Dc-link capacitance, H bridge inverter, lc circuit and fundamental frequency transformer, the dc-link capacitance and H bridge inverter are in parallel,
The H bridge inverter rear end is equipped with transformer, it is preferable that the transformer be (Voltage Source Inverter,
VSI) voltage source inverter；
Charge and discharge electrical interface inverter circuit is used to be charged and discharged the battery energy storage system, carries out power quality change
It changes.
It should be noted that lc circuit and fundamental frequency transformer portion are directly realized by substantially single-phase demand, can also be bridged by H at
Three-phase may be omitted with fundamental frequency transformer to realize three-phase demand (same transformer can also be connected into three-phase), by the adjacent bridge arm of H bridge
Switch is closed at, and the adjacent bridge arm of another pair is simultaneously switched off to provide direct current demand, can be realized according to specific power demand
Different power quality transformation.
Further, two batteries in double half-bridge structure units cannot simultaneously be bypassed by controllable switch, when need simultaneously
When being bypassed, then replaces another double relatively small number of branches of half-bridge structure element number and participate in output, and there was only one simultaneously
Branch participates in output.
On the other hand, the present invention provides a kind of control methods of dynamically reconfigurable battery energy storage system, comprising:
The parameter of data collecting module collected battery in battery management subsystem, and parametric results are transferred to state and are estimated
Module is counted, state computation module, which is used to make real-time status according to the parameter of the single battery, to be determined, switch motion control
Module is constructed according to the judgement, the real-time action topology of the control information and double half-bridge structure units that determine output,
PWM occurs module and is exported according to half-wave step type SPWM wave, generates pulse to control output, passes through charge and discharge electrical interface inverter electricity
Road performs battery charging or discharges.
Those skilled in the art will be understood that the quantity for double half-bridge structure units that Fig. 1 is only shown for simplicity, can
Can less than the quantity in a real system, but it is this omit be undoubtedly with will not influence to inventive embodiments carry out it is clear, fill
Premised on the disclosure divided.
Embodiment 2
This embodiment offers a kind of control methods of dynamically reconfigurable battery energy storage system, include the following steps:
1) functional application of selecting system, an example here is single phase ac outputs；
2) parameter of the data collecting module collected battery in battery management subsystem, state estimation module is according to described
Parametric results carry out real-time status judgement to the state of battery；
3) switch motion control module determines the switch motion in double half-bridge structure units, by shape according to the judgement
The better monomer of state is put into longer ladder in the cycle to realize equilibrium, and realizes the voltage amplitude of staircase waveform analog sine
Value requires, and determines frequency to the corresponding bridge arm switch of control H bridge when commutation；
4) switch motion control module progress real-time action topology is constructed, and periodically detects whether that changing for power demand occurs
Become, and enters 2).
The PWM that the emulation of the present embodiment uses is mainly Carrier-shifted PWM and carrier wave stacking PWM analog sine, and Fig. 6 is
The PWM analog sine waveforms figure of the embodiment of the present invention 2, H bridge with regard to adjacent bridge arm with state on-off can be realized direct current input or it is defeated
Out.
Schematically, for realizing carrier wave stacking PWM, wherein restrictive condition are as follows:
A. battery SOC in the battery energy storage system branch of balanced current application；
B. the battery in each double half-bridge structure units cannot bypass simultaneously (therefore every branch maximum voltage V is minimum
Can provide is V/2, otherwise turns to another branch and provides voltage ladder).
Specifically control method includes:
1, the branch number for determining double half-bridge structure units according to enough voltage magnitudes or level quantity can be provided:
Specifically, log is taken2N rounds up.Schematically, there are 6 voltage ladder output single-phase exchanges, at least need (0,
1,2,3,4,5,6) 7 kinds of level numbers, just take log26 round up, and are exactly 3 branches, i.e., the system needs one, two and four
Three branch circuit parallel connections of a double half-bridge structure units provide output, and Fig. 7 is double half-bridge structure units of the embodiment of the present invention 2
Three branch circuit parallel connection figures.
2, then by the selected input of each ladder or output state, and SOC balance strategy is combined:
First ladder output is correspondingly placed into one of battery (using the branch of a double half-bridge structure units
With more SOC or that battery of external voltage when weighing apparatus strategy can determine to export), provide corresponding switch control signal；
Second ladder is all exported using two batteries of branch of a double half-bridge structure units；
Third ladder is with regard to handoff leg, using the branch of two double half-bridge structure units, one of them double half-bridge structure
Unit all exports, and (balance policy determines less SOC in these batteries to the battery output in another double half-bridge structure unit
Or the battery of external voltage is not involved in output)；
4th ladder is all exported using the branch of two double half-bridge structure units；
5th ladder handoff leg selects one of them double half-bridge knot using the branch of four double half-bridge structure units
Two battery of structure unit all exports, other three double half-bridge structure units respectively select an output, selects less stay by balance policy
Under, it is not involved in output；
6th ladder still uses the branch of four double half-bridge structure units, selects the branch of the double half-bridge structure units of two of them
Two battery of road all exports, and the branch of other two double half-bridge structure units respectively selects an output, selects by balance policy less
It leaves, is not involved in output；
After to 1/4 cycle, voltage ladder wave is formed by the state overturning above step of carrier wave.
3, H bridge commutates after every half cycles, repeats step 2；
4, each period is monitored battery status, input or the detection of output power demand, according to input or output
Power requirements strategy and balance policy adjustment.
The detailed process of dynamically reconfigurable battery energy storage system is carried out with before using the control method of the embodiment of the present invention
It is similar to state embodiment of the method, details are not described herein again.
In conclusion the dynamically reconfigurable battery energy storage system of the embodiment of the present invention can be reduced and be switched in battery system
Usage amount, dynamically reconfigurable battery energy storage system control method through the invention control battery system, method letter
It is single, it easily performs.
Those of ordinary skill in the art will appreciate that: attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Process is not necessarily implemented necessary to the present invention.
System embodiment described above is only schematical, wherein described, module can as illustrated by the separation member
It is physically separated with being or may not be, the component shown as module may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
In the case where labour, it can understand and implement.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (9)
1. a kind of dynamically reconfigurable battery energy storage system characterized by comprising energy storage subsystem, charge and discharge electrical interface it is inverse
Become device circuit and battery management subsystem；
The energy storage subsystem includes X double half-bridge structure unit branches, and X is the integer more than or equal to 1；
Double half-bridge structure units include two batteries and three controllable switches, and the positive terminal of the first battery and first is controllably
Switch is connected, and by being connected with third controllable switch, one end of the second controllable switch is connected to described the negative pole end of the second battery
Between first battery and the series connection point of the first controllable switch, the other end of the second controllable switch is connected to second battery and
Between the series connection point of three controllable switches.
2. system according to claim 1, which is characterized in that when X is the integer greater than 1, the X double half-bridge knots
Structure unit branch is parallel with one another, and every double half-bridge structure unit branch routings are with 2nIt connects for double half-bridge structure units of increased number
It constitutes, n is positive integer.
3. system according to claim 1, which is characterized in that double half-bridge structure unit branch in the battery energy storage system
The quantity on road is calculated according to overall level quantity.
4. system according to claim 1, which is characterized in that the battery management subsystem includes data acquisition module
Module occurs for block, state computation module, switch motion control module and pulse width modulation (PWM)；
The data acquisition module is used to acquire the electric parameter of single battery；
The state computation module, which is used to make real-time status according to the parameter of the single battery, to be determined；
The real-time status that the switch motion control module is used to be made according to the state estimation module determines, determines defeated
Control information out；
The PWM occurs module and is used to be exported according to half-wave step type SPWM wave, generates pulse to control output.
5. system according to claim 1, which is characterized in that the charge and discharge electrical interface inverter circuit includes direct current mother
Line capacitance, H bridge inverter, lc circuit and fundamental frequency transformer, the dc-link capacitance and H bridge inverter parallel connection, the H
The rear end of bridge inverter is equipped with transformer；
The charge and discharge electrical interface inverter circuit is used to be charged and discharged the battery energy storage system.
6. system according to claim 1, which is characterized in that the dynamic duty selecting party of double half-bridge structure units
Case includes: that the first battery is connected into system main branch, and the second cell bypass；Or second battery be connected into system main branch, and first
Cell bypass；Or first battery and the second battery be all connected into system main branch.
7. system according to claim 1, which is characterized in that two batteries in double half-bridge structure units cannot
It is bypassed simultaneously by controllable switch.
8. system according to claim 1, which is characterized in that the battery management subsystem further includes that failure cuts relay
Device guarantees for fault-safety principle, cuts off known fail battery monomer.
9. a kind of control method of system described in claim 1-8 characterized by comprising
The parameter of data collecting module collected battery in battery management subsystem, and parametric results are transferred to state estimation mould
Block, state computation module, which is used to make real-time status according to the parameter of the single battery, to be determined, switch motion control module
It is constructed according to the real-time action topology of the judgement, the control information and double half-bridge structure units that determine output, PWM hair
Raw module is exported according to half-wave step type SPWM wave, generates pulse to control output, by charge and discharge electrical interface inverter circuit into
The charge or discharge of row battery.
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| Publication number | Priority date | Publication date | Assignee | Title |
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