CN107785967A - Accumulation power supply system capacity balance control method, control device and equalizing system - Google Patents
Accumulation power supply system capacity balance control method, control device and equalizing system Download PDFInfo
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- CN107785967A CN107785967A CN201711167548.5A CN201711167548A CN107785967A CN 107785967 A CN107785967 A CN 107785967A CN 201711167548 A CN201711167548 A CN 201711167548A CN 107785967 A CN107785967 A CN 107785967A
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The present invention relates to accumulation power supply system capacity balance control method, control device and equalizing system, in charge balancing control, first obtains the electric energy of the actual storage of each energy-storage module, and find wherein minimum electric energy；Then the error amount of other each electric energy and minimum electric energy is calculated, and judges the size of each error amount and the first setting trimming threshold, for each error amount beyond the first setting trimming threshold, is charged according to energy storage branch road corresponding to corresponding PWM control Pulse Width Controls.In equalization discharge control, what is found is maximum electric energy, and calculate the electric energy of maximum and the error amount of other each actual powers, for each error amount beyond the second setting trimming threshold, discharged according to energy storage branch road corresponding to corresponding PWM control Pulse Width Controls, in above-mentioned two situations, the dutycycle of PWM control pulses with the size of error amount is in inverse ratio.Corresponding charge-discharge energy distribution is carried out according to the energy state of each energy-storage module, realizes balancing energy control.
Description
Technical field
The present invention relates to accumulation power supply system capacity balance control method, control device and equalizing system, belong to energy storage
The balancing energy control technology field of power-supply system.
Background technology
With national new energy industry and the fast development of intelligent grid construction, the application of large-scale energy-storage system is also increasingly
Extensively, PCS structure type and the size of DC bus-bar voltage are limited to, accumulation power supply system typically uses multiple branch circuit simultaneously at present
The mode of connection, to meet requirement of the application scenarios to capacity and power, and according to the difference of PCS DC side module topology structures,
The access form of energy-storage system branch road be divided into concentration conflux access and sub-module access two ways, wherein sub-module access form
It is beneficial to realize circulation control, but is limited to the quantity of PCS DC side modules, for large-scale energy storage, even if using PCS sub-module
Topological structure, that multiple branch circuit parallel connections conflux also still be present.
Common accumulation power supply system includes at least two energy storage branch roads being arranged in parallel, and each energy storage branch road is provided with energy storage
Module, energy-storage module are connected and composed by least one cell by corresponding annexation.However, conventional energy-storage system
Branch road exports framework, does not possess any type of energy management and control unit, only relies upon automatic between batteries in parallel connection group
Balancing energy.With the passage of system operation time, there is difference in the internal resistance of each branch road, although each branch road pair in running
The voltage of outer presentation is consistent, but the actual storage electric energy of its each branch road has produced difference, for such difference, as long as system obtains
To sufficiently long time of repose, can recover automatically, but with requirement of the large-scale energy storage to day charge and discharge cycles number increasingly
Height, each branch road can not obtain the enough automatic equalization time, and with the increase of cycle-index, the energy difference opposite sex will be more and more convex
It is aobvious, so as to cause the actual charge-discharge energy of system to shrink significantly, in addition, when any one branch road in multiple subsystems in parallel
When moving back operation, and needing to put into operation after being resumed, it is necessary to after the adjustment unanimously of its capacity status, it can put into,
Greatly reduce operation and the efficiency safeguarded.
If therefore operating condition can be implemented according to each branch road in system, automatic equalization and the control of each branch road electric energy are realized
System, intellectuality, security, reliability and the stability integrally used system are respectively provided with irreplaceable significance.
The content of the invention
It is an object of the invention to provide a kind of accumulation power supply system capacity balance control method, to accumulation power supply system
In each energy storage branch road carry out automatic equalization.Present invention simultaneously provides a kind of accumulation power supply system capacity equalising control device and one kind
Accumulation power supply system capacity equalizing system.
To achieve the above object, the present invention includes following technical scheme.
Method scheme one：A kind of accumulation power supply system capacity balance control method of this programme offer, including charging process
The balancing energy control strategy of balancing energy control strategy and/or discharge process,
The balancing energy control strategy of the charging process includes following control process：
(1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds wherein minimum electric energy；
(2) error amount of the electric energy and minimum electric energy of the actual storage of other each energy-storage modules is calculated, and judges each mistake
Difference and the size of the first setting trimming threshold；
(3) for energy storage branch road corresponding to each error amount beyond the first setting trimming threshold, controlled according to corresponding PWM
Each energy storage branch road of Pulse Width Control is charged, and the dutycycle of PWM control pulses and the size of error amount are in inverse ratio；
The balancing energy control strategy of the discharge process includes following control process：
1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds maximum of which electric energy；
2) error amount of maximum electric energy and the electric energy of the actual storage of other each energy-storage modules is calculated, and judges each error
Value and the size of the second setting trimming threshold；
3) for energy storage branch road corresponding to each error amount beyond the second setting trimming threshold, controlled according to corresponding PWM
Each energy storage branch road of Pulse Width Control is discharged, and the dutycycle of PWM control pulses and the size of error amount are in inverse ratio.
When carrying out the control of charging process balancing energy, first, the actual storage of energy-storage module in each energy storage branch road is obtained
Electric energy, and find wherein minimum electric energy；Then the electric energy of the actual storage of each energy-storage module and minimum electric energy are calculated
Error amount, and judge the size of each error amount and the first setting trimming threshold, for each mistake beyond the first setting trimming threshold
Energy storage branch road corresponding to difference, charged according to corresponding PWM control each energy storage branch roads of Pulse Width Control, PWM control pulses
Dutycycle and the size of error amount are in inverse ratio, then, energy state is higher during for charging, i.e. the higher energy-storage module of electric energy,
When being charged to it, charged according to PWM charge mode, also, energy state is higher, and PWM duty cycle is smaller, fills
Electric flux is smaller, that is to say, that energy-storage module during charging more than electric energy reduces rechargeable energy, according to the capacity volume variance of energy-storage module
Size accordingly adjusts PWM dutycycle, so that the electric energy of each energy-storage module reaches unanimity in the course of the work, realizes that energy is equal
Weighing apparatus.Similarly, when carrying out the control of discharge process balancing energy, and PWM duty cycle, energy accordingly obtained according to energy state
The relatively low energy-storage module of state, the i.e. relatively low energy-storage module of electric energy, when discharging it, enter according to PWM discharge mode
Row electric discharge, also, energy state is relatively low, and PWM duty cycle is smaller, and discharge energy is smaller, and the few energy-storage module of electric energy subtracts during electric discharge
Few discharge energy, PWM dutycycle is accordingly adjusted according to the capacity volume variance size of energy-storage module, so as to each storage in the course of the work
The electric energy of energy module reaches unanimity, and realizes balancing energy.Therefore, according to the energy state of each energy-storage module, dynamically adjustment is each in real time
The charge-discharge energy distribution of energy-storage module, realizes the balancing energy control of each energy-storage module, while solves energy-storage module parallel connection
When battery pack circulation problem present in charge and discharge process.
Also, this method is applied to the energy-storage system of any energy-storage module quantity, and existing system framework need not be changed, examined
Survey and rate-determining steps are simple, the detection parameters being related to are less, can dynamically be adjusted in real time according to the energy state of each energy-storage module
The charge-discharge energy distribution of whole each energy-storage module, realize the balancing energy control of each energy-storage module.
Method scheme two：On the basis of method scheme one,
The calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of minimum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining；
The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of maximum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining.
Device scheme one：This programme provides a kind of accumulation power supply system capacity equalising control device, including memory, processing
Device and storage in memory and the computer program that can run on a processor, reality during the computing device described program
The now balancing energy control strategy of the balancing energy control strategy of following charging process and/or discharge process：
The balancing energy control strategy of the charging process includes following control process：
(1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds wherein minimum electric energy；
(2) error amount of the electric energy and minimum electric energy of the actual storage of other each energy-storage modules is calculated, and judges each mistake
Difference and the size of the first setting trimming threshold；
(3) for energy storage branch road corresponding to each error amount beyond the first setting trimming threshold, controlled according to corresponding PWM
Each energy storage branch road of Pulse Width Control is charged, and the dutycycle of PWM control pulses and the size of error amount are in inverse ratio；
The balancing energy control strategy of the discharge process includes following control process：
1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds maximum of which electric energy；
2) error amount of maximum electric energy and the electric energy of the actual storage of other each energy-storage modules is calculated, and judges each error
Value and the size of the second setting trimming threshold；
3) for energy storage branch road corresponding to each error amount beyond the second setting trimming threshold, controlled according to corresponding PWM
Each energy storage branch road of Pulse Width Control is discharged, and the dutycycle of PWM control pulses and the size of error amount are in inverse ratio.
Device scheme two：On the basis of device scheme one,
The calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of minimum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining；
The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of maximum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining.
System schema one：This programme provides a kind of accumulation power supply system capacity equalizing system, including control module, for examining
The electric energy detection module of the electric energy of the actual storage of energy-storage module in each energy storage branch road is surveyed, and for being arranged on energy storage branch road
Charging control switch and/or discharge control switch, control module sampling connects the electric energy detection module, control connection
The charging control switch and/or discharge control switch, control module is according to energy-storage module in each energy storage branch road received
The electric energy of actual storage carries out the balancing energy control of charging process and/or the balancing energy control of discharge process, wherein,
The balancing energy control process of charging process comprises the following steps：(1) energy-storage module in each energy storage branch road
Wherein minimum electric energy is found in the electric energy of actual storage；(2) electric energy and minimum of the actual storage of each energy-storage module are calculated
The error amount of electric energy, and judge the size of each error amount and the first setting trimming threshold；(3) for beyond the first balanced threshold of setting
Energy storage branch road corresponding to each error amount of value, export corresponding PWM to corresponding charging control switch and control pulse, PWM controls
The dutycycle of pulse and the size of error amount are in inverse ratio；
The balancing energy control process of discharge process comprises the following steps：1) reality of the energy-storage module in each energy storage branch road
Maximum of which electric energy is found in the electric energy of border storage；2) maximum electric energy and the electric energy of the actual storage of each energy-storage module are calculated
Error amount, and judge each error amount and second setting trimming threshold size；3) for beyond the second setting trimming threshold
Energy storage branch road corresponding to each error amount, export corresponding PWM to corresponding discharge control switch and control pulse, PWM control pulses
Dutycycle and the size of error amount be in inverse ratio.
System schema two：On the basis of system schema one,
The calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of minimum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining；
The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating
With the ratio of the electric energy of maximum, corresponding capacity volume variance percentage is obtained, then, 1 subtracts corresponding capacity volume variance percentage just
The dutycycle of PWM controls pulse corresponding to obtaining.
System schema three：On the basis of system schema one or two, the charging control switch is parallel with charged bypass
Switch, the discharge control switch are parallel with electric discharge by-pass switch.
Brief description of the drawings
Fig. 1 is accumulation power supply system capacity equalizing system circuit diagram；
Fig. 2 is the control flow chart between system running state and corresponding controlling switch；
Fig. 3 is the energy ordering schematic diagram of energy-storage module；
Fig. 4 is a kind of schematic diagram of embodiment of the corresponding relation between energy-storage module electric energy and dutycycle；
Fig. 5 is accumulation power supply system capacity Balance route schematic flow sheet.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is accumulation power supply system capacity equalizing system circuit diagram, and system includes battery pack, electronic power switch, bypass
Switch and controller, wherein, battery pack includes N number of energy-storage module being arranged in parallel, and each energy-storage module is by least one monomer electricity
Pond is formed according to corresponding annexation, N >=2.Part where each energy-storage module be referred to as energy storage branch road or battery branch road (with
It is referred to as battery branch road down), therefore, in the present embodiment, system includes N number of battery branch road.
Therefore, as shown in figure 1, for any one battery branch road, the branch road includes energy-storage module, fuse, electric current and passed
Sensor and breaker, annexation are supporting in each battery branch road to be provided with a branch road as shown in figure 1, in the present embodiment
Controller, therefore, system include N number of branch controller, and this N number of branch controller is connected with system control unit communication, realized
The Balance route of battery pack, certainly, as other embodiments, only it can also realize whole battery pack using a controller
Control, then, the controller is just BMS.Also, in order to get the electric energy of the actual storage of energy-storage module, battery branch road
In be additionally provided with electric energy detection module (not shown), controller sampling connection electric energy detection module and current sensor, energy
Enough obtain the electric energy of the actual storage of energy-storage module, such as 100kWh.In the present embodiment, the operation principle of electric energy detection module
It is：The electric energy of the actual storage of energy-storage module is estimated according to historical data, size of current and discharge and recharge operating mode, certainly, also
The electric energy of the actual storage of energy-storage module can be detected according to other existing electric energy detection modes.In order to more intuitively real
Control is now charged and discharged, string is provided with two controlling switches on battery branch road, is that charging control switch and control of discharge are opened respectively
Close, string is located at the both ends of energy-storage module respectively, and in the present embodiment, charging control switch and discharge control switch are power electronics
Switch, respectively IGBT device G1 and IGBT device G2.Moreover, IGBT device G1 both ends are parallel with by-pass switch K1, IGBT
Device G2 both ends are parallel with by-pass switch K2, and when electronic power switch failure, after closing by-pass switch, system still can be normal
Operation, while can be closed when branch road need not carry out balancing energy control, to reduce system loss.Branch controller control connects
IGBT device G1, IGBT device G2, by-pass switch K1 and by-pass switch K2 corresponding to connecing.
Although above-mentioned give a kind of system hardware circuit structure, it is of the invention that to focus on battery pack power equal
Weigh control method, therefore, any to realize battery pack energy provided by the invention the invention is not limited in foregoing circuit structure
The system architecture for measuring balance control method is within the scope of the present invention.
System control unit coordinates with each branch controller realizes balancing energy control.Wherein, system control unit possesses
The electric energy sequence of each branch road storage and PWM duty cycle computing function, branch controller possess energy-storage module status monitoring and equilibrium
Dual-use function is performed, can be instructed according to Balance route, be turned on and off Balance route, therefore, each branch controller possesses PWM controls
Fan-out capability processed.
State during system normal operation judges to include three parts：Stand, be charged and discharged.Under static condition, system
Equilibrium need not be opened, as shown in Fig. 2 under charged state and discharge condition, to IGBT device G1 and IGBT device G2 progress
On the basis of corresponding control, charge balancing need to disconnect charged bypass switch K1 and be closed at the by-pass switch K2 that discharges, equalization discharge
Need disconnection electric discharge by-pass switch K2 to be closed at charged bypass switch K1, at the end of equilibrium, close K1 and K2, close simultaneously
Charge and discharge balancing pulse, to reduce the loss of electronic power switch.
Balancing energy control strategy is described in detail below, the control strategy includes the balancing energy control of charging process
The balancing energy control strategy of system strategy and/or discharge process, therefore, the present invention can only include above-mentioned two control strategy
Any one, can also include the two control strategies simultaneously.Below by simultaneously including being said exemplified by the two control strategies
It is bright.
The balancing energy control of charging process：
First, the electric energy of the actual storage of each energy-storage module is obtained, it is just as stated above, it is big according to historical data, electric current
Small and discharge and recharge operating mode, estimate the electric energy size of the actual storage of each energy-storage module.In order to more intuitively and accurately represent each
Relation between the electric energy of energy-storage module, the electric energy of the actual storage of each energy-storage module is ranked up, it is specially descending
It is ranked up, as shown in figure 3, like this, being just easily found wherein minimum electric energy, and energy storage mould corresponding to the electric energy
Block.Electric energy sequence can by system control unit according to each branch controller upload energy data is ranked up, for avoid electric energy compared with
Equalizing circuit is frequently turned on and off for close branch road, therefore actual capacity value can be combined, is set capacity threshold section (such as 5Ah)
To reduce controller software resource, equalization efficiency is improved.
Then, for other each electric energy except minimum electric energy, the error amount of these electric energy and minimum electric energy, this reality are calculated
Apply in example, the error amount judges each difference and the size of the first setting trimming threshold by taking difference as an example, and first setting is balanced
Threshold value is the balancing energy threshold value of setting, is set according to the control of reality requirement.By beyond the first setting trimming threshold
Difference is picked out, and finds energy-storage module corresponding to these differences and battery branch road, then, for beyond the first balanced threshold of setting
Each battery branch road of value, charged according to corresponding PWM control each battery branch roads of Pulse Width Control, specific control object is each
Charging control switch on battery branch road, i.e. IGBT device G1.Wherein, the dutycycle of PWM controls pulse and the size of difference are in
Inverse ratio, when difference is bigger, that is, it is bigger to correspond to the difference of the electric energy and minimum electric energy of energy-storage module, represents the electricity of the energy-storage module
Can be bigger, then, rechargeable energy will be reduced during charging, reduces PWM duty cycle, that is to say, that electric energy bigger storage during charging
The rechargeable energy of energy module is smaller, and PWM duty cycle is smaller, by the distribution of this PWM duty cycle, can shorten and minimum is electric
Gap between energy, balancing energy can be realized, as shown in Figure 4.
Further, the operation relation between the dutycycle and difference of PWM controls pulse given below.
First, calculating difference and the ratio of minimum electric energy, corresponding capacity volume variance percentage is obtained, calculation formula is such as
Under：
The electric energy of capacity volume variance percentage=(electric energy of actual power-minimum)/minimum
Then, 1 the dutycycle that corresponding capacity volume variance percentage just obtains corresponding PWM controls pulse is subtracted, calculated public
Formula is as follows：
PWM duty cycle=(1- capacity volume variances percentage)/100%
Branch controller in charging process, controls battery branch road according to electric energy size and the corresponding relation of PWM duty cycle
IGBT device G1 work in PWM state.
Until the electric energy of each battery branch road and the difference of minimum electric energy represent energy within balancing energy threshold range
Equilibrium terminates, and by-pass switch K1 and K2 are closed, and G1 and G2 can be stopped.
Accordingly, it is capable to the unlocking condition for measuring equilibrium is judged by the size of electric energy difference and threshold value, after it is determined that needing balanced, by
Branch controller exports pwm control signal to corresponding battery branch road, real so as to change the rechargeable energy size of the battery branch road
The now balanced purpose of each branch energy.
The balancing energy control of discharge process：
First, the electric energy of the actual storage of each energy-storage module is obtained, balancing energy of this part in above-mentioned charging process
Have been carried out illustrating in control section, just repeat no more here.Similarly, in order to more intuitively and accurately represent each energy-storage module
Storage electric energy between relation, the actual power of each energy-storage module is ranked up, it is specially descending to be ranked up.
Like this, maximum of which electric energy, and energy-storage module corresponding to the electric energy are just easily found.
Then, for other each actual powers except maximum power, maximum electric energy and these other each reality are calculated
The error amount of electric energy, in the present embodiment, the error amount judges the big of each difference and the second setting trimming threshold by taking difference as an example
Small, this second sets trimming threshold as the balancing energy threshold value (energy of the balancing energy threshold value and above-mentioned charging process that sets
Balancing energy threshold value in Balance route part is two parameters, and both can be with identical, can also be different), according to the control of reality
Requirement processed is set.It will be picked out beyond the difference of the second setting trimming threshold, find energy storage mould corresponding to these differences
Block and battery branch road, then, for each battery branch road beyond the second setting trimming threshold, pulse is controlled according to corresponding PWM
Each battery branch road is controlled to be discharged, specific control object is the discharge control switch on each battery branch road, i.e. IGBT device
G2.Wherein, it is in inverse ratio that PWM, which controls the dutycycle of pulse and the size of difference, when difference is bigger, that is, corresponds to the electricity of energy-storage module
Can be bigger with the difference of maximum power, represent that the electric energy of the energy-storage module is smaller, then, discharge energy will be reduced during electric discharge,
Reducing PWM duty cycle, that is to say, that the discharge energy of the smaller energy-storage module of electric energy is smaller during electric discharge, and PWM duty cycle is smaller,
By the distribution of this PWM duty cycle, the gap between maximum power can be shortened, balancing energy can be realized, such as
Shown in Fig. 4.
Further, the operation relation between the dutycycle and difference of PWM controls pulse given below.
First, calculating difference and the ratio of maximum electric energy, corresponding capacity volume variance percentage is obtained, calculation formula is such as
Under：
Capacity volume variance percentage=(maximum power-actual power)/maximum power
Then, 1 the dutycycle that corresponding capacity volume variance percentage just obtains corresponding PWM controls pulse is subtracted, calculated public
Formula is as follows：
PWM duty cycle=(1- capacity volume variances percentage)/100%
Branch controller in discharge process, controls battery branch road according to electric energy size and the corresponding relation of PWM duty cycle
IGBT device G2 work in PWM state.
Until the electric energy of each battery branch road and the difference of maximum power represent energy within balancing energy threshold range
Equilibrium terminates, and by-pass switch K1 and K2 are closed, and G1 and G2 can be stopped.
Accordingly, it is capable to the unlocking condition for measuring equilibrium is judged by the size of electric energy difference and threshold value, after it is determined that needing balanced, by
Branch controller exports pwm control signal to corresponding battery branch road, real so as to change the discharge energy size of the battery branch road
The now balanced purpose of each branch energy.
Fig. 5 is accumulation power supply system capacity Balance route schematic flow sheet.
Either charging process or discharge process, of the battery branch road of balancing energy are will also be appreciated that by above-mentioned
Number scope is 1~N-1, and the number for carrying out the battery branch road of balancing energy is up to N-1.
Therefore, in normal system operation, the energy state of each battery branch road is monitored in real time by branch controller, and
According to the otherness of each branch road electric energy of system discharge and recharge condition calculating, energy state higher battery branch road during for charging, with
And energy state relatively low battery branch road during for electric discharge, corresponding electronic power switch is worked in PWM state, then by propping up
Road controller adjusts PWM dutycycle according to branch energy difference size, with dynamically adjust the rechargeable energy of the battery branch road and
Discharge energy, so that each branch energy can finally reach unanimity system in the course of the work.
The balance control method can be applied to the energy-storage system multiple branch circuit parallel configurations of current main flow simultaneously, if only needing to fill
Electric process is balanced, removes or disables discharge control switch, if only needing discharge process balanced, removes or disables charge control
Switch, in addition, when charging control switch or electric discharge charging control switch failure, after closing by-pass switch, system is still
Can normal operation, while when by-pass switch failure, controlling switch is also operable with normally open while realizing balanced,
System may continue to operate with failure, and therefore, the balancing energy method is while solution branch energy unbalanced problem, greatly
Ground improves the energy utilization efficiency of system, also substantially increases reliability and flexibility that system uses.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment is carried out are still fallen within protection scope of the present invention.
The above method can be used as a kind of computer program, be stored in accumulation power supply system capacity equalising control device
It can run in memory and on the processor in accumulation power supply system capacity equalising control device.
Claims (7)
- A kind of 1. accumulation power supply system capacity balance control method, it is characterised in that the balancing energy control including charging process The balancing energy control strategy of strategy and/or discharge process,The balancing energy control strategy of the charging process includes following control process：(1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds wherein minimum electric energy；(2) error amount of the electric energy and minimum electric energy of the actual storage of other each energy-storage modules is calculated, and judges each error amount With the size of the first setting trimming threshold；(3) for energy storage branch road corresponding to each error amount beyond the first setting trimming threshold, pulse is controlled according to corresponding PWM Each energy storage branch road is controlled to be charged, the dutycycle of PWM control pulses and the size of error amount are in inverse ratio；The balancing energy control strategy of the discharge process includes following control process：1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds maximum of which electric energy；2) calculate the error amount of maximum electric energy and the electric energy of the actual storage of other each energy-storage modules, and judge each error amount with The size of second setting trimming threshold；3) for energy storage branch road corresponding to each error amount beyond the second setting trimming threshold, pulse is controlled according to corresponding PWM Each energy storage branch road is controlled to be discharged, the dutycycle of PWM control pulses and the size of error amount are in inverse ratio.
- 2. accumulation power supply system capacity balance control method according to claim 1, it is characterised in thatThe calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating with most The ratio of small electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse；The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating with most The ratio of big electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse.
- 3. a kind of accumulation power supply system capacity equalising control device, including memory, processor and storage are in memory simultaneously The computer program that can be run on a processor, it is characterised in that following charge is realized during the computing device described program The balancing energy control strategy of process and/or the balancing energy control strategy of discharge process：The balancing energy control strategy of the charging process includes following control process：(1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds wherein minimum electric energy；(2) error amount of the electric energy and minimum electric energy of the actual storage of other each energy-storage modules is calculated, and judges each error amount With the size of the first setting trimming threshold；(3) for energy storage branch road corresponding to each error amount beyond the first setting trimming threshold, pulse is controlled according to corresponding PWM Each energy storage branch road is controlled to be charged, the dutycycle of PWM control pulses and the size of error amount are in inverse ratio；The balancing energy control strategy of the discharge process includes following control process：1) electric energy of the actual storage of energy-storage module in each energy storage branch road is obtained, and finds maximum of which electric energy；2) calculate the error amount of maximum electric energy and the electric energy of the actual storage of other each energy-storage modules, and judge each error amount with The size of second setting trimming threshold；3) for energy storage branch road corresponding to each error amount beyond the second setting trimming threshold, pulse is controlled according to corresponding PWM Each energy storage branch road is controlled to be discharged, the dutycycle of PWM control pulses and the size of error amount are in inverse ratio.
- 4. accumulation power supply system capacity equalising control device according to claim 3, it is characterised in thatThe calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating with most The ratio of small electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse；The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating with most The ratio of big electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse.
- 5. a kind of accumulation power supply system capacity equalizing system, it is characterised in that including control module, for detecting each energy storage branch road The electric energy detection module of the electric energy of the actual storage of middle energy-storage module, and the charge control for being arranged on energy storage branch road are opened Close and/or discharge control switch, the control module sampling connect the electric energy detection module, control connects the charge control Switch and/or discharge control switch, control module are carried out according to the actual power of energy-storage module in each energy storage branch road received The balancing energy control of charging process and/or the balancing energy control of discharge process, wherein,The balancing energy control process of charging process comprises the following steps：(1) reality of the energy-storage module in each energy storage branch road Wherein minimum electric energy is found in the electric energy of storage；(2) electric energy of the actual storage of each energy-storage module and minimum electric energy are calculated Error amount, and judge each error amount and first setting trimming threshold size；(3) for beyond the first setting trimming threshold Energy storage branch road corresponding to each error amount, export corresponding PWM to corresponding charging control switch and control pulse, PWM control pulses Dutycycle and the size of error amount be in inverse ratio；The balancing energy control process of discharge process comprises the following steps：1) energy-storage module in each energy storage branch road is actually deposited Maximum of which electric energy is found in the electric energy of storage；2) mistake of maximum electric energy and the electric energy of the actual storage of each energy-storage module is calculated Difference, and judge the size of each error amount and the second setting trimming threshold；3) for each mistake beyond the second setting trimming threshold Energy storage branch road corresponding to difference, export corresponding PWM to corresponding discharge control switch and control pulse, PWM control pulses account for Sky is in inverse ratio than the size with error amount.
- 6. accumulation power supply system capacity equalizing system according to claim 5, it is characterised in thatThe calculating process of the dutycycle of each PWM control pulses in charging process is as follows：First, error amount corresponding to calculating with most The ratio of small electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse；The calculating process of the dutycycle of each PWM control pulses in discharge process is as follows：First, error amount corresponding to calculating with most The ratio of big electric energy, corresponding capacity volume variance percentage is obtained, then, 1, which subtracts corresponding capacity volume variance percentage, just obtains The dutycycle of corresponding PWM controls pulse.
- 7. the accumulation power supply system capacity equalizing system according to claim 5 or 6, it is characterised in that the charge control Switch in parallel has charged bypass switch, and the discharge control switch is parallel with electric discharge by-pass switch.
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