CN106505676B - Battery power discharge control method and control device based on cascade energy accumulation current converter - Google Patents
Battery power discharge control method and control device based on cascade energy accumulation current converter Download PDFInfo
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- CN106505676B CN106505676B CN201611047265.2A CN201611047265A CN106505676B CN 106505676 B CN106505676 B CN 106505676B CN 201611047265 A CN201611047265 A CN 201611047265A CN 106505676 B CN106505676 B CN 106505676B
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- 238000009825 accumulation Methods 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004146 energy storage Methods 0.000 claims abstract description 59
- 230000005611 electricity Effects 0.000 claims description 10
- 230000000052 comparative effect Effects 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 238000011217 control strategy Methods 0.000 description 16
- 239000004065 semiconductor Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009790 rate-determining step (RDS) Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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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
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H02J2007/0067—
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
-
- 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 relates to battery power discharge control methods and control device based on cascade energy accumulation current converter, first determine whether the number of energy accumulation current converter for needing to bypass in battery pack；When the number for the energy accumulation current converter for needing to bypass is less than or equal to 1, the error amount of the voltage of the corresponding minimum voltage of the smallest energy accumulation current converter of voltage and other each energy accumulation current converters in battery pack is calculated；Finally when the absolute value of minimum voltage and the error amount of the voltage of other each energy accumulation current converters is all larger than the error threshold of a setting, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of voltage, to carry out PWM electric discharge to its energy storage device.By carrying out PWM regulation to the current transformer, to solve the problems, such as that battery pack caused by the inconsistency and failure of some energy accumulation current converter can not work normally in battery pack, the whole regulation of battery pack is realized.So discharge control method provided by the invention effectively can carry out control of discharge to battery pack.
Description
Technical field
The present invention relates to battery power discharge control methods and control device based on cascade energy accumulation current converter.
Background technique
Currently, with the fast development of new energy energy storage, energy-storage battery be widely used with high speed development to
The fast development of energy-storage system is driven.Since energy-storage battery has apparent non-linear, inconsistency and time-varying characteristics, make it
Due to the influence of charge acceptance, self-discharge rate and capacity attenuation rate etc. between each monomer group in long-term charge and discharge process,
It is easy to cause the discreteness between stack battery to increase, performance degradation aggravates, and can encounter battery in energy-storage battery group use process
Group voltage inconsistence problems, directly affect the performance of whole cluster energy-storage battery, and serious situation can even occur to threaten the tight of safety
Weight consequence.
Traditional battery control strategy is from the battery cell angle in battery pack, and there are energy consumptions and efficiency
Low problem needs effectively to be managed from the angle of energy-storage battery group according to energy-storage battery group characteristic, to guarantee
The safely and controllably operation of entire energy-storage battery cluster, this is for safeguarding energy-storage battery group safety, holding energy-storage battery group performance, prolonging
The long energy-storage battery group service life all has great importance.
As shown in Figure 1, being a kind of battery pack based on energy accumulation current converter, the MMC energy storage including several cascade settings becomes
Device is flowed, each MMC energy accumulation current converter includes energy storage device and converter plant, and energy storage device can be single battery, is also possible to
The battery pack being made of several single batteries.Due to being provided with independent energy storage device and unsteady flow in each energy accumulation current converter
Device, so, by several energy accumulation current converters battery pack for constituting of cascade, in control, difficulty is larger, existing control method without
Method effectively carries out charge and discharge control to such battery pack.
Summary of the invention
The object of the present invention is to provide a kind of battery power discharge control methods based on cascade energy accumulation current converter, for solving
The problem of existing control method effectively can not carry out control of discharge to such battery pack.Present invention simultaneously provides one kind to be based on
Cascade the battery power discharge control device of energy accumulation current converter.
To achieve the above object, the solution of the present invention includes a kind of battery power discharge control method, comprising the following steps:
(1) judge the number for the energy accumulation current converter for needing to bypass in battery pack；
(2) when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1, it is the smallest to calculate voltage in battery pack
The error amount of the voltage of the corresponding minimum voltage of energy accumulation current converter and other each energy accumulation current converters；
(3) it is set when the absolute value of the minimum voltage and the error amount of the voltage of other each energy accumulation current converters is all larger than one
When fixed error threshold, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of the voltage, to the voltage
Energy storage device in the smallest energy accumulation current converter carries out PWM electric discharge.
The voltage for detecting certain energy accumulation current converter determines that the energy storage becomes when lower voltage limit threshold value of the voltage less than a setting
Stream device needs to bypass.
Voltage is most after determining that the number of energy accumulation current converter that needs bypass is less than or equal to 1, in comparative cell group
The size of the corresponding maximum voltage of big energy accumulation current converter and the upper voltage limit threshold value of setting, be greater than when the maximum voltage or
Equal to setting upper voltage limit threshold value when, calculate the error amount of the voltage of the minimum voltage and other each energy accumulation current converters.
A kind of battery power discharge control device, comprising:
Judgment module, the number of the energy accumulation current converter for judging to need to bypass in battery pack；
Computing module, for calculating in battery pack when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1
The error amount of the voltage of the corresponding minimum voltage of the smallest energy accumulation current converter of voltage and other each energy accumulation current converters；
Control module, it is equal for the absolute value when the minimum voltage and the error amount of the voltage of other each energy accumulation current converters
When the error threshold set greater than one, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of the voltage, with
PWM electric discharge is carried out to the energy storage device in the smallest energy accumulation current converter of the voltage.
The voltage for detecting certain energy accumulation current converter determines that the energy storage becomes when lower voltage limit threshold value of the voltage less than a setting
Stream device needs to bypass.
Voltage is most after determining that the number of energy accumulation current converter that needs bypass is less than or equal to 1, in comparative cell group
The size of the corresponding maximum voltage of big energy accumulation current converter and the upper voltage limit threshold value of setting, be greater than when the maximum voltage or
Equal to setting upper voltage limit threshold value when, calculate the error amount of the voltage of the minimum voltage and other each energy accumulation current converters.
The energy accumulation current converter that battery power discharge control method provided by the invention needs to bypass suitable for battery pack is most
Only one the case where, during discharge, when the brownout of some energy accumulation current converter needs to bypass, to the energy storage
Current transformer carries out PWM control of discharge, reduces the output of its energy, guarantees that it is participating in battery pack in the case where not being bypassed just
Often in operation, avoids the energy accumulation current converter and be bypassed, improve battery pack reliability of operation.So by the energy storage
Current transformer carries out PWM regulation, to solve battery caused by the inconsistency and failure of some energy accumulation current converter in battery pack
The problem that group can not work normally realizes the whole regulation of battery pack.So discharge control method provided by the invention can
Control of discharge effectively is carried out to battery pack.
Discharge control method provided by the invention directly bypasses energy accumulation current converter compared to when voltage is less than certain value,
Entire battery pack is improved in the discharging efficiency in platform voltage stage, moreover, because when directly bypassing energy accumulation current converter, relatively
It can be risen rapidly in the voltage of other batteries, the corresponding battery of the energy accumulation current converter, it is most likely that cause voltage to be judged by accident, in turn
Lead to false protection, so, which can be avoided the erroneous judgement of voltage caused by cell voltage rises rapidly and protection
Malfunction.
The discharge control method is able to solve the problem of causing entire battery pack utility ratio to reduce because of energy accumulation current converter difference,
To realize voltage balance control, solves the problems, such as consistency of battery pack, allow each energy accumulation current converter that can reach optimum capacity
State.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of the battery pack based on energy accumulation current converter；
Fig. 2 is the connection relationship diagram between battery pack and BMS；
Fig. 3 is the control principle schematic diagram of energy accumulation current converter；
Fig. 4 is that the schematic diagram of relationship is connected with corresponding switching tube for three kinds of states of energy accumulation current converter；
Fig. 5 is the overall flow block diagram of charge control method；
Fig. 6 is a kind of control flow schematic diagram of embodiment of charge control method；
Fig. 7 is the overall flow block diagram of discharge control method；
Fig. 8 is a kind of control flow schematic diagram of embodiment of discharge control method.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Charge control method embodiment
As shown in Fig. 2, battery pack includes N number of MMC energy accumulation current converter, the number of N is set according to the actual situation, and
And the battery pack includes BMS main control module, for controlling each energy accumulation current converter, so, in the battery pack, BMS
Main control module controls the algorithm of each MMC energy accumulation current converter in BMS as execution unit as control unit, MMC energy accumulation current converter
It is realized in MCU kernel in main control module.
The structure of each energy accumulation current converter is identical, for wherein any one energy accumulation current converter, the MMC energy accumulation current converter
It further include thering is a control circuit and a driving circuit also to wrap certainly other than including energy storage device and converter plant
Include the voltage check device and current detection means that corresponding position in energy accumulation current converter is set.Control circuit sampling connection electricity
Press detection device and current detection means, the effect of the control circuit can be on energy accumulation current converter voltage sample information with
Current sample information carries out preliminary treatment；Driving circuit be used for according to control signal driving converter plant on switching tube (such as
Metal-oxide-semiconductor) conducting or shutdown movement.
Each energy accumulation current converter is communicated to connect by corresponding control circuit and BMS main control module, each to control in the present embodiment
Circuit connects CAN bus by communication line, and BMS main control module also connects CAN bus, to realize each energy accumulation current converter and BMS
Main control module communication connection.Each control circuit is identified by an address, BMS main control module according to address.
BMS main control module obtains the voltage sample letter on corresponding energy accumulation current converter by CAN bus and each control circuit
Breath and current sample information, and according to setting in the information of voltage of each energy accumulation current converter collected and BMS main control module
Control strategy generates the control signal of corresponding energy accumulation current converter, and control signal is handed down to corresponding driving circuit, and next pair
Switching tube on converter plant carries out conducting or shutdown movement, as shown in Figure 3.
Can be seen that its tool according to the structure of MMC energy accumulation current converter, there are three types of states, are charged state, electric discharge shape respectively
State and bypass condition, as shown in Figure 4, wherein charged state and bypass condition are normal operating conditions, and bypass condition is safety
Guard mode.When corresponding energy accumulation current converter failure, bypass condition is opened, to carry out safeguard protection to the energy accumulation current converter.
So from the foregoing, the structure of battery pack and each energy accumulation current converter belongs to routine techniques, although above-mentioned provide
Certain structure, but be intended merely to draw following control strategies, therefore, the invention is not limited to above structures.
And the control strategy set in BMS main control module is then inventive point of the invention, which includes two parts,
It is charge control strategy and control of discharge strategy respectively, charge control strategy is the control plan that battery pack carries out during the charging process
Slightly, control of discharge strategy is the control strategy that battery pack carries out during discharge.It is filled below to what is set in BMS main control module
Electric control strategy is illustrated.
The charge control strategy, i.e. charge control method integrally include the following steps, as shown in Figure 5:
(1) judge the number for the energy accumulation current converter for needing to bypass in battery pack；
(2) when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1, it is maximum to calculate voltage in battery pack
The error amount of the voltage of the corresponding maximum voltage of energy accumulation current converter and other each energy accumulation current converters；
(3) when the absolute value of maximum voltage and the error amount of the voltage of other each energy accumulation current converters is all larger than a setting
When error threshold, PWM control is carried out to the converter plant in the maximum energy accumulation current converter of voltage, to the maximum energy storage of the voltage
Energy storage device in current transformer carries out PWM charging.
For above steps, specific embodiment is given below.
When the number for the energy accumulation current converter for needing to bypass in judging battery pack, two kinds of implementation processes are given below:
The first is direct judgment mode, specifically: BMS main control module receives the information of voltage of each energy accumulation current converter, by
During the charging process, when overtension for the safety of energy accumulation current converter, need to bypass energy accumulation current converter, institute
With BMS main control module compares the voltage of each energy accumulation current converter and the upper voltage limit threshold value of setting, when there is energy accumulation current converter
When voltage is greater than the upper voltage limit threshold value of the setting, determines the energy accumulation current converter overtension, need to bypass.BMS main control module
All energy accumulation current converters are compared, the quantity for needing the energy accumulation current converter bypassed is finally obtained.As for needing to bypass
When number is greater than 1, which terminates；When the number for needing to bypass is less than or equal to 1, the charging control is continued to execute
System strategy.Therefore, the number which is applicable to the energy accumulation current converter of bypass is 1 or 0.
Second and indirect judgement, specially following steps:
1) BMS main control module compares the voltage of each energy accumulation current converter and the upper voltage limit threshold value of setting, when there is energy storage
When the voltage of current transformer is greater than the upper voltage limit threshold value of the setting, determines the energy accumulation current converter overtension, need to bypass.BMS
Main control module is compared all energy accumulation current converters, finally obtains the quantity for needing the energy accumulation current converter bypassed.Work as needs
When the number of bypass is greater than x, which terminates；When the number for needing to bypass is less than or equal to x, continue to execute
The charge control strategy；Wherein, x is determined by the number of energy accumulation current converter, and x is greater than 1 here；
2) BMS main control module is ranked up the voltage of all energy accumulation current converters, and the energy storage for marking ceiling voltage becomes
Flow the energy accumulation current converter of device and minimum voltage；
3) when the voltage En for a certain energy accumulation current converter in battery pack occur is greater than the upper voltage limit threshold value of setting, Er Qie electricity
For pond group there is also an energy accumulation current converter, the voltage of the energy accumulation current converter is the ceiling voltage Emax in battery pack, i.e. Emax >=
When En, which terminates, and otherwise continues to execute charge control strategy downwards.That is, when there is at least two storages
When the voltage of energy current transformer is greater than the upper voltage limit threshold value of setting, which terminates, only the number of bypass in need
When less than or equal to 1, the charge control strategy is just executed.
So tentatively being judged first in the above-mentioned second way, the energy accumulation current converter for needing to bypass is found, then
It makes and further limiting, when only the number of bypass in need is less than or equal to 1, just execute the charge control strategy.
It is related to upper voltage limit threshold value in the above process, which is setting value, according to the electricity of energy storage device
Pressure situation is set.Under normal conditions, the battery module that energy storage device is made of multiple single batteries, so, according to one
The maximum charging voltage of single battery and the available upper voltage limit threshold value of the number of single battery, such as: upper voltage limit
Threshold value is equal to the maximum charging voltage of a single battery multiplied by the number of single battery, if the maximum of a single battery is filled
Piezoelectric voltage is 3.65V, and energy storage device is in series by 16 single batteries, then, upper voltage limit threshold value can for 3.65V ×
16=58.4V.
After determining the number for needing the energy accumulation current converter bypassed and being less than or equal to 1, voltage in comparative cell group
The size of the corresponding minimum voltage of the smallest energy accumulation current converter and the lower voltage limit threshold value of setting, when the minimum voltage is less than setting
Lower voltage limit threshold value when, continue to execute the charge control strategy.Wherein, lower voltage limit threshold value is also setting value, and according to
The voltage condition of energy storage device is set, similar to the setting principle of above-mentioned upper voltage limit threshold value, which can
It is set as 55.6V.
When minimum voltage be less than setting lower voltage limit threshold value when, according to the maximum energy accumulation current converter of voltage in battery pack into
The following processing of row: the electricity of the maximum energy accumulation current converter of the voltage corresponding maximum voltage and other each energy accumulation current converters is calculated separately
The error amount of pressure, by taking difference as an example；Then the error threshold (such as 2V) set the absolute value of each difference and one respectively into
Row compares, if the absolute value of each difference is all larger than the error threshold of the setting, in the maximum energy accumulation current converter of voltage
Converter plant carry out PWM control, in the energy accumulation current converter energy storage device carry out PWM charging, i.e., to energy storage device according to
PWM wave charges according to a certain percentage.Under normal circumstances, the energy storage device under charged state utilizes metal-oxide-semiconductor T1 corresponding two
Pole pipe D1 charging, is not controlled by the on-off of metal-oxide-semiconductor T1, is charged always under the action of diode D1, as shown in figure 4, so,
When control carries out PWM charging to energy storage device, on-off control cannot be carried out to metal-oxide-semiconductor T1, need to carry out on-off control to metal-oxide-semiconductor T2
System, in a PWM cycle, there are two level state, one of level state control metal-oxide-semiconductor T2 to disconnect for PWM wave, passes through two
Pole pipe D1 charges to energy storage device, another level state controls metal-oxide-semiconductor T2 closure, and energy accumulation current converter is in bypass shape
State can not charge to energy storage device, therefore, in a PWM cycle, can carry out on-off control to metal-oxide-semiconductor T2 by PWM
System, can control energy accumulation current converter and not charge not instead of always, charge according to a certain percentage, realize and carry out to energy storage device
PWM charging.It wherein, is to set according to the actual situation to duration, frequency and the duty ratio of the PWM charge control of energy storage device
It sets, such as in the present embodiment, PWM duration is no longer than the control period of 60s, frequency 20KHz, duty ratio 0.5.
Fig. 6 is a kind of specific implementation process of charge control strategy.
In above-described embodiment, after determining that the number for needing the energy accumulation current converter bypassed is less than or equal to 1, comparative cell group
The size of the corresponding minimum voltage of the middle the smallest energy accumulation current converter of voltage and the lower voltage limit threshold value of setting, when minimum voltage is less than
When the lower voltage limit threshold value of setting, the error amount of maximum voltage and the voltage of other each energy accumulation current converters is calculated.The embodiment is only
It is a kind of embodiment of optimization, as other embodiments, can be omitted, that is, exist according to the rate-determining steps that minimum voltage carries out
It determines that the number for needing the energy accumulation current converter bypassed is less than or equal to after 1, can also directly calculate maximum voltage and other are each
Then the error amount of the voltage of energy accumulation current converter carries out subsequent control.
Battery charge controller embodiment
The battery charge controller includes following three modules:
Judgment module, the number of the energy accumulation current converter for judging to need to bypass in battery pack.
Computing module, for calculating in battery pack when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1
The error amount of the voltage of the corresponding maximum voltage of the maximum energy accumulation current converter of voltage and other each energy accumulation current converters；
Control module is all larger than for the absolute value when maximum voltage and the error amount of the voltage of other each energy accumulation current converters
One setting error threshold when, in the maximum energy accumulation current converter of voltage converter plant carry out PWM control, with to voltage most
Energy storage device in big energy accumulation current converter carries out PWM charging.
By analyzing it is found that three modules of the control device are three in software module, with charge control method
Step corresponds, and therefore, which is substantially still control method, by loading in BMS to realize its charging
The function of control describes in detail, here just not due to being made that control method in above-mentioned charge control method embodiment
It illustrates again.
Discharge control method embodiment
The discharge control method based on battery pack topological structure and other dependency structures and above-mentioned charge control side
Identical in method embodiment, the present embodiment just no longer illustrates, stresses below to discharge control method.
The discharge control method has following steps on the whole, as shown in Figure 7:
(1) judge the number for the energy accumulation current converter for needing to bypass in battery pack；
(2) when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1, it is the smallest to calculate voltage in battery pack
The error amount of the voltage of the corresponding minimum voltage of energy accumulation current converter and other each energy accumulation current converters；
(3) when the absolute value of minimum voltage and the error amount of the voltage of other each energy accumulation current converters is all larger than a setting
When error threshold, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of voltage, to become to the smallest energy storage of voltage
The energy storage device flowed in device carries out PWM electric discharge.
For above steps, specific embodiment is given below.
When the number for the energy accumulation current converter for needing to bypass in judging battery pack, two kinds of implementation processes are given below:
The first is direct judgment mode, specifically: BMS main control module receives the information of voltage of each energy accumulation current converter, by
During discharge, when brownout for the safety of energy accumulation current converter, need to bypass energy accumulation current converter, institute
With BMS main control module compares the voltage of each energy accumulation current converter and the lower voltage limit threshold value of setting, when there is energy accumulation current converter
When voltage is less than the lower voltage limit threshold value of the setting, determines the energy accumulation current converter brownout, need to bypass.BMS main control module
All energy accumulation current converters are compared, the quantity for needing the energy accumulation current converter bypassed is finally obtained.As for needing to bypass
When number is greater than 1, which terminates；When the number for needing to bypass is less than or equal to 1, the electric discharge control is continued to execute
System strategy.Therefore, the number which is applicable to the energy accumulation current converter of bypass is 1 or 0.
Second and indirect judgement, specially following steps:
1) BMS main control module compares the voltage of each energy accumulation current converter and the lower voltage limit threshold value of setting, when there is energy storage
When the voltage of current transformer is less than the lower voltage limit threshold value of the setting, determines the energy accumulation current converter brownout, need to bypass.BMS
Main control module is compared all energy accumulation current converters, finally obtains the quantity for needing the energy accumulation current converter bypassed.Work as needs
When the number of bypass is greater than x, which terminates；When the number for needing to bypass is less than or equal to x, continue to execute
The control of discharge strategy；Wherein, x is determined by the number of energy accumulation current converter, and x is greater than 1 here.
2) BMS main control module is ranked up the voltage of all energy accumulation current converters, and the energy storage for marking ceiling voltage becomes
Flow the energy accumulation current converter of device and minimum voltage.
3) when the voltage En for a certain energy accumulation current converter in battery pack occur is less than the lower voltage limit threshold value of setting, Er Qie electricity
For pond group there is also an energy accumulation current converter, the voltage of the energy accumulation current converter is the minimum voltage Emin in battery pack, i.e. Emin≤
When En, which terminates, and otherwise continues to execute control of discharge strategy downwards.That is, when there is at least two storages
When the voltage of energy current transformer is less than the lower voltage limit threshold value of setting, which terminates, only the number of bypass in need
When less than or equal to 1, the control of discharge strategy is just executed.
So tentatively being judged first in the above-mentioned second way, the energy accumulation current converter for needing to bypass is found, then
It makes and further limiting, when only the number of bypass in need is less than or equal to 1, just execute the control of discharge strategy.
It is related to lower voltage limit threshold value in the above process, which is setting value, according to the electricity of energy storage device
Pressure situation is set.Under normal conditions, the battery module that energy storage device is made of multiple single batteries, so, according to one
The minimum discharge voltage of single battery and the available lower voltage limit threshold value of the number of single battery, such as: lower voltage limit
Threshold value is equal to the minimum discharge voltage of a single battery multiplied by the number of single battery, if the minimum of single battery is put
Piezoelectric voltage is 2.7V, and energy storage device is in series by 16 single batteries, then, lower voltage limit threshold value can be 2.7V × 16
=43.2V.
After determining the number for needing the energy accumulation current converter bypassed and being less than or equal to 1, voltage in comparative cell group
The size of the corresponding maximum voltage of maximum energy accumulation current converter and the upper voltage limit threshold value of setting, be greater than when the maximum voltage or
Equal to setting upper voltage limit threshold value when, continue to execute the control of discharge strategy.Wherein, upper voltage limit threshold value is also setting value,
And set according to the voltage condition of energy storage device, it is similar to the setting principle of above-mentioned lower voltage limit threshold value, on the voltage
Limiting threshold value can be 44.8V.
It is the smallest according to voltage in battery pack when above-mentioned maximum voltage is more than or equal to the upper voltage limit threshold value of setting
Energy accumulation current converter carries out the following processing: calculating separately the corresponding minimum voltage of the smallest energy accumulation current converter of the voltage and other each storages
The error amount of the voltage of energy current transformer, by taking difference as an example；Then error threshold (the ratio set the absolute value of each difference and one
Such as 2V) it is compared respectively, if the absolute value of each difference is all larger than the error threshold of the setting, to the smallest energy storage of voltage
Converter plant in current transformer carries out PWM control, to carry out PWM electric discharge, i.e. basis to the energy storage device in the energy accumulation current converter
PWM wave is discharged according to a certain percentage.Under normal circumstances, energy storage device in the discharged condition when, metal-oxide-semiconductor T1 closure and metal-oxide-semiconductor
T2 is disconnected, as shown in Figure 4；When under bypass condition, metal-oxide-semiconductor T1 is disconnected and metal-oxide-semiconductor T2 is closed.So in control to energy storage device
When carrying out PWM electric discharge, there are two level states in PWM a cycle: low level and high level, wherein a level state control
Metal-oxide-semiconductor T1 processed is disconnected and metal-oxide-semiconductor T2 closure, another level state controls metal-oxide-semiconductor T1 closure and metal-oxide-semiconductor T2 is disconnected, so,
In one PWM cycle, energy storage device discharges in certain proportion, i.e., energy storage device carries out PWM electric discharge.Wherein, to PWM when
Long, frequency and duty ratio are to be configured according to the actual situation, for example in the present embodiment, control of the duration no longer than 60s is all
Phase, frequency 20KHz, duty ratio 0.5.
Fig. 8 is a kind of specific implementation process of charge control strategy.
It is more electric after determining that the number for needing the energy accumulation current converter bypassed is less than or equal to 1 in above-described embodiment
The size of the corresponding maximum voltage of the maximum energy accumulation current converter of Chi Zuzhong voltage and the upper voltage limit threshold value of setting, works as maximum voltage
More than or equal to setting upper voltage limit threshold value when, calculate the error of the voltage of minimum voltage and other each energy accumulation current converters
Value.The embodiment is a kind of embodiment of optimization, as other embodiments, the rate-determining steps carried out according to maximum voltage
It can be omitted, i.e., after determining that the number for needing the energy accumulation current converter bypassed is less than or equal to 1, can also directly calculate minimum
The error amount of the voltage of voltage and other each energy accumulation current converters, then carries out subsequent control.
Discharge control device embodiment
The discharge control device includes following three modules:
Judgment module, the number of the energy accumulation current converter for judging to need to bypass in battery pack.
Computing module, for calculating in battery pack when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1
The error amount of the voltage of the corresponding minimum voltage of the smallest energy accumulation current converter of voltage and other each energy accumulation current converters.
Control module is all larger than for the absolute value when minimum voltage and the error amount of the voltage of other each energy accumulation current converters
One setting error threshold when, in the smallest energy accumulation current converter of voltage converter plant carry out PWM control, with to voltage most
Energy storage device in small energy accumulation current converter carries out PWM electric discharge.
By analyzing it is found that three modules of the control device are three in software module, with discharge control method
Step corresponds, and therefore, which is substantially still control method, by loading in BMS to realize its electric discharge
The function of control describes in detail, here just not due to being made that control method in above-mentioned discharge control method embodiment
It illustrates again.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to 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 carries out are still fallen in protection scope of the present invention.
Claims (6)
1. a kind of battery power discharge control method, which comprises the following steps:
(1) judge the number for the energy accumulation current converter for needing to bypass in battery pack；
(2) when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1, the smallest energy storage of voltage in battery pack is calculated
The error amount of the voltage of the corresponding minimum voltage of current transformer and other each energy accumulation current converters；
(3) when the absolute value of the minimum voltage and the error amount of the voltage of other each energy accumulation current converters is all larger than a setting
When error threshold, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of the voltage, with minimum to the voltage
Energy accumulation current converter in energy storage device carry out PWM electric discharge.
2. battery power discharge control method according to claim 1, which is characterized in that detect the electricity of certain energy accumulation current converter
Pressure determines that the energy accumulation current converter needs to bypass when lower voltage limit threshold value of the voltage less than a setting.
3. battery power discharge control method according to claim 1 or 2, which is characterized in that in the storage for determining that needs bypass
The number of energy current transformer is less than or equal to after 1, the corresponding maximum electricity of the maximum energy accumulation current converter of voltage in comparative cell group
The size of pressure and the upper voltage limit threshold value of setting, when the maximum voltage is more than or equal to the upper voltage limit threshold value of setting,
Calculate the error amount of the minimum voltage and the voltage of other each energy accumulation current converters.
4. a kind of battery power discharge control device characterized by comprising
Judgment module, the number of the energy accumulation current converter for judging to need to bypass in battery pack；
Computing module, for calculating voltage in battery pack when the number for the energy accumulation current converter for needing to bypass is less than or equal to 1
The error amount of the voltage of the smallest corresponding minimum voltage of energy accumulation current converter and other each energy accumulation current converters；
Control module is all larger than for the absolute value when the minimum voltage and the error amount of the voltage of other each energy accumulation current converters
When the error threshold of one setting, PWM control is carried out to the converter plant in the smallest energy accumulation current converter of the voltage, to institute
The energy storage device stated in the smallest energy accumulation current converter of voltage carries out PWM electric discharge.
5. battery power discharge control device according to claim 4, which is characterized in that detect the electricity of certain energy accumulation current converter
Pressure determines that the energy accumulation current converter needs to bypass when lower voltage limit threshold value of the voltage less than a setting.
6. battery power discharge control device according to claim 4 or 5, which is characterized in that in the storage for determining that needs bypass
The number of energy current transformer is less than or equal to after 1, the corresponding maximum electricity of the maximum energy accumulation current converter of voltage in comparative cell group
The size of pressure and the upper voltage limit threshold value of setting, when the maximum voltage is more than or equal to the upper voltage limit threshold value of setting,
Calculate the error amount of the minimum voltage and the voltage of other each energy accumulation current converters.
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| CN114696431B (en) * | 2022-05-09 | 2022-09-30 | 上海玫克生储能科技有限公司 | Charging and discharging efficiency ratio adjusting method, storage medium and adjusting device of energy storage power station |
| CN116760153B (en) * | 2023-08-17 | 2024-04-16 | 中宏科创新能源科技(浙江)有限公司 | Energy storage system integrating battery management and variable-current control |
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