CN116317025B - Charging and discharging control method and system for energy storage system - Google Patents
Charging and discharging control method and system for energy storage system Download PDFInfo
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- CN116317025B CN116317025B CN202310510358.8A CN202310510358A CN116317025B CN 116317025 B CN116317025 B CN 116317025B CN 202310510358 A CN202310510358 A CN 202310510358A CN 116317025 B CN116317025 B CN 116317025B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000007599 discharging Methods 0.000 title claims description 29
- 230000008859 change Effects 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 12
- 230000007774 longterm Effects 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or 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
- 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
- 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
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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
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The disclosure relates to a method and a system for controlling charge and discharge of an energy storage system, wherein the method comprises the following steps: preset charging power start limit interval C c1 Discharge power start limit section C d1 The method comprises the steps of carrying out a first treatment on the surface of the In the charging power start limit section C c1 Discharge power start limit section C d1 And carrying out gradient limiting step-by-step adjustment on the actual charge and discharge power. The system and the method can actively intervene in power regulation and abnormal change of the converter in real time by combining the battery system operation limiting condition and power abnormal fluctuation, and on the premise of meeting the system response speed, the problem between the safety and the response performance of the system in the rapid power change is well solved by the BMS supplementary intervention means, and long-term hidden impact damage caused by the power change can be effectively reduced or avoided.
Description
Technical Field
The disclosure relates to the technical field of energy storage charge and discharge control, in particular to a charge and discharge control method and system of an energy storage system.
Background
Currently, a system architecture diagram of a large lithium ion electrochemical cell energy storage system is shown in fig. 1, and it is one of the mainstream schemes to connect multiple battery cluster units in parallel on the dc side. When high-power charge and discharge is carried out, because of the inconsistency of parameters such as the capacity, the internal resistance and the like of the battery clusters, if the high-power scheduling response is too fast or the power abnormally fluctuates, the high power originally shared by a plurality of battery cluster units is instantaneously applied to a few battery cluster units, so that instantaneous impact is caused.
In the prior art, a Battery Management System (BMS) only performs limit protection on out-of-range conditions of voltage, current and temperature, and the protection is only boundary protection, and cannot limit long-term hidden impact damage of high-power scheduling on the battery system. This long term concealment is currently mainly regulated by the smooth slope of the bi-directional converter (PCS) power regulation in the energy storage system, but this approach suffers from the following drawbacks:
the bidirectional converter is a passive limiting protection, the protection effect of the bidirectional converter depends on the rationality of converter parameter configuration, and the bidirectional converter has the defects of single judgment condition, limited regulation means, larger impact on a battery system, slower regulation, substandard system performance, larger debugging difficulty and the like when the power response is too fast, so that the energy storage system is subjected to the problems of reduced availability, safety threat, lost service life of the battery system and the like in the long-term operation process.
Disclosure of Invention
In order to solve the problems in the prior art, the disclosure aims to provide a method and a system for controlling charge and discharge of an energy storage system. The system and the method can actively intervene in power regulation and abnormal change of the converter in real time by combining the battery system operation limiting condition and power abnormal fluctuation, and on the premise of meeting the system response speed, the problem between the safety and the response performance of the system in the rapid power change is well solved by the BMS supplementary intervention means, and long-term hidden impact damage caused by the power change can be effectively reduced or avoided.
The charge and discharge control method of the energy storage system comprises the following steps: presetting a charging power start limit interval C related to an energy storage system c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]；
In the process of starting the charging of the energy storage system control converter, the charging power limit value P is made c— limit is within the charging power start limit section C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c 。
Preferably, the method for controlling charge and discharge of the energy storage system further comprises:
presetting a charging power fluctuation limit interval C related to an energy storage system c2 Discharge power start limit section C d2 ，C c2 ＝[P cmax ，P c ]，C d2 ＝[P d ，P dmax ]；
When the energy storage system control converter is switched from discharging to charging, the charging power limit value P is set c— limit is equal to rated charge power limit value P cmax And limit the discharge power to a value P d— Limit is P d ；
When the energy storage system controls the converter to switch from charging to discharging, the discharging power limit value P is set d— limit is equal to rated discharge power limit value P dmax And limit the charging power to P c— Limit is P c 。
Preferably, the P c Calculating according to the maximum charging power of single battery cluster units in the energy storage system, wherein P is d Calculating according to the maximum discharge power of a single battery cluster unit in the energy storage system; specific:
P c cell charge cutoff voltage cell cluster series cell number maximum allowed charge current;
P d cell discharge cut-off voltage cell cluster series cell number maximum allowed discharge current;
wherein, the value range of the battery monomer charging cut-off voltage is [ 3.6-3.7V ]; the value range of the discharge cut-off voltage of the single battery is 2.5-2.7V, and the value range of the serial connection electric core number of the battery cluster is 1-40; and obtaining the maximum allowable charging current of the battery cell and the maximum allowable discharging current of the battery cell according to the parameters of the battery cell.
Preferably, in the process of controlling the converter to start charging and starting discharging by the energy storage system, the preset gradient number is d,0<d is less than or equal to 10;
in the process of starting charging of the energy storage system control converter, the charging power limit value P c— The stepwise change of limit is (0-P) c )/d；
In the process of starting discharge of the energy storage system control converter, the charging power limit value P d— The stepwise change of limit was (P d -0)/d。
Preferably, the limiting sustain time d of each stage gradient t D is 10ms less than or equal to d t ≤1000ms。
Preferably, during the charging process of the energy storage system control converter, the actual charging power P rc Close to P c The method comprises the following steps:
98％|P c |≤|P rc |≤102％|P c |；
in the process of starting discharge of the energy storage system control converter, the actual discharge power P rd Close to P d The method comprises the following steps:
98％P d ≤P rd ≤102％P d 。
preferably, the energy storage system is preset with a charging power boundary protection value P c— out and discharge Power boundary protection value P d— out, charging Power Limit value P c— limit＝P c— out∧P c— limit, discharge power limit value P d— limit＝P d— out∧P d— limit。
The charge and discharge control system of the energy storage system comprises an energy management system, a converter and a battery management system which are connected in a two-by-two communication mode;
in the battery management systemPresetting a charging power start limit interval C related to an energy storage system c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]；
In the process of starting the charging of the energy storage system control converter, the charging power limit value P is made c— limit is within the charging power start limit section C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c 。
The method and the system for controlling the charge and discharge of the energy storage system have the advantages that gradient grading limitation of charge and discharge power is achieved by setting a charge power starting limit interval and a discharge power starting limit interval, and the power limitation is carried out before charge and discharge switching by setting a charge power fluctuation limit interval and a discharge power starting limit interval, so that rapid starting power impact generated in the moment of system charge and discharge starting and power impact generated in the moment of charge and discharge switching can be effectively reduced or avoided, power regulation and abnormal change of a converter can be actively interfered in real time, and on the premise of meeting the response speed of the system, the problem between the safety and the response performance of the system in the rapid power change can be well compensated by a BMS supplementary intervention means, and long-term hidden impact damage caused by the power change can be effectively reduced or avoided.
Drawings
FIG. 1 is a schematic diagram of a prior art energy storage system;
fig. 2 is a schematic diagram of a power limiting section of the present embodiment;
fig. 3 is an internal communication schematic diagram of the energy storage system of the present embodiment.
Reference numerals illustrate: EMS-energy management system, BMS-battery management system, PCS-converter.
Detailed Description
As shown in fig. 1-3, a method for controlling charge and discharge of an energy storage system according to the present disclosure includes:
in order to avoid the rapid starting impact at the moment of starting the system in charge and discharge, a charging power starting limit interval C related to the energy storage system is preset c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]The method comprises the steps of carrying out a first treatment on the surface of the Specifically, P c Calculation of P according to maximum charging power of single battery cluster unit in energy storage system d And calculating according to the maximum discharge power of the single battery cluster unit in the energy storage system.
Specific:
P c cell charge cutoff voltage cell cluster series cell number maximum allowed charge current;
P d cell discharge cut-off voltage cell cluster series cell number maximum allowed discharge current;
wherein, the value range of the battery monomer charging cut-off voltage is [ 3.6-3.7V ]; the value range of the discharge cut-off voltage of the single battery is 2.5-2.7V, and the value range of the serial connection electric core number of the battery cluster is 1-40; the maximum allowable charging current and the maximum allowable discharging current of the battery cell are obtained according to the parameters of the battery cell, and can be obtained from the specification of the battery cell.
In the process of starting charging of the energy storage system control converter, limiting charging powerValue P c— limit is within the charging power start limit section C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
Specifically, in the charging power start limit section C c1 In, the charging power limit value P c— limit is changed step by step according to the gradient, when the actual charging power P rc Close to P c When, i.e. when the actual charging power P rc And P c Error of + -2P or less c Namely, satisfies:
98％|P c |≤|P rc |≤102％|P c |；
at the actual charging power P rc After the above conditions are satisfied, the actual charging power P is determined rc Close to the preset P c Charging power limit value P corresponding to the gradient c— limit is charged as rated charge power while the discharge limit power value P d— Limit is P d The power scheduling discharge instruction is executed by the PCS of the converter to quickly adjust the power to discharge, and the BMS is free from constraint to cause impact.
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c ；
In particular, at discharge power startRestriction interval C d1 Discharge power limit value P d— limit is changed step by step according to the gradient, when the actual discharge power P rd Close to P d When, i.e. when the actual discharge power P rd And P d Error of + -2P or less d Namely, satisfies:
98％P d ≤P rd ≤102％P d ；
at the actual discharge power P rd After the above conditions are satisfied, the actual discharge power P is determined rd Close to the preset P d Limiting the discharge power P corresponding to the gradient d— limit is discharged as rated discharge power while charging limit power P c— Limit is P c The power scheduling charging instruction is executed by the PCS of the converter to quickly adjust the power to charge, and the BMS is free from constraint to cause impact.
More specifically, the gradient progression of the power limitation described above is configurable to ensure that the power varies substantially orderly between charge and discharge over this interval.
In the process of controlling the converter to start charging and starting discharging by the energy storage system, the preset gradient level is d,0<d is less than or equal to 10, the gradient level can be defined as a plurality of gradient levels, and the gradient level can be configured according to the requirements in a range.
Limited sustain time d for each stage gradient t In the range of 10ms less than or equal to d t ≤1000ms，d t The limit maintaining time of the d gradient level is shown, the minimum limit maintaining time is 10ms, the maximum limit maintaining time is 1000ms, and the limit maintaining time can be specially configured according to the required limit maintaining time of each gradient level in the range so as to realize flexible adjustment of charge and discharge power.
Further, in the process of starting charging of the energy storage system control converter, the charging power limit value P c— The stepwise change of limit is (0-P) c )/d；
In the process of starting discharge of the energy storage system control converter, the charging power limit value P d— The stepwise change of limit was (P d -0)/d。
So that the charging power limit value is equally different in the gradient range, and the power regulating process is smooth and stable.
Besides solving the problem of high-power unidirectional starting impact, the charging and discharging switching actions of the system also need to be considered, and when the PCS of the converter is rapidly switched between charging and discharging, the BMS is not limited due to excessively rapid regulation speed. Therefore, the BMS needs to limit before switching between charging and discharging, and the specific idea is similar to the above-mentioned charging and discharging power limiting process, and the BMS needs to limit discharging during charging and charging during discharging.
Therefore, in the present embodiment, the charging power start limit section C is described above c1 Discharge power start limit section C d1 The charging power fluctuation limiting section C of the energy storage system is further arranged c2 Discharge power start limit section C d2 ，C c2 ＝[P cmax ，P c ]，C d2 ＝[P d ，P dmax ]；
When the energy storage system control converter is switched from discharging to charging, the energy storage system control converter is positioned in a charging power fluctuation limiting section C c2 In consideration of the overall charge response performance of the system, the charge power limit value P is set c— limit is equal to rated charge power limit value P cmax And limit the discharge power to a value P d Limit to P d To avoid instant high power discharge;
when the energy storage system control converter is switched from charging to discharging, the energy storage system control converter is positioned in a discharging power starting limiting section C d2 In consideration of the overall charge response performance of the system, the discharge power limit value P is set d Limit is equal to the rated discharge power limit value P dmax And limit the charging power to P c— Limit is P c To avoid momentary high power charging.
Furthermore, in the existing energy storage system, the battery management system BMS sets the charging power boundary protection value P according to the out-of-limit conditions such as voltage, current, temperature, etc c -out and discharge power boundary protection value P d— out, when the battery management system BMS performs the power limiting control on the converter PCS, the charging power limiting value P is set c —limit＝P c —out∧P c Limit of discharge powerValue P d— limit＝P d— out∧P d— limit, i.e., the limit value takes the relatively smaller value of the boundary protection value and the gradient limit value to ensure the power protection effect and avoid the over-power operation of the system.
The embodiment also provides a charge and discharge control system of the energy storage system, which comprises an energy management system, a converter and a battery management system which are connected in a communication way;
the battery management system is preset with a charging power start limit section C related to the energy storage system c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]；
In the process of starting the charging of the energy storage system control converter, the charging power limit value P is made c— limit is within the charging power start limit section C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c 。
The charge and discharge control system and the charge and discharge control method of the energy storage system according to the present embodiment are based on the inventive concept of the system, and can be understood with reference to the above description, and are not repeated here.
According to the method, the gradient grading limitation of the charge and discharge power is realized by setting the charge power starting limiting interval and the discharge power starting limiting interval, and the power limitation is carried out before the charge and discharge switching by setting the charge power fluctuation limiting interval and the discharge power starting limiting interval, so that the rapid starting power impact generated in the moment of system charge and discharge starting and the power impact generated in the moment of charge and discharge switching can be effectively reduced or avoided, the power regulation and abnormal change of the converter can be actively interfered in real time, and the problem between the safety and the response performance of the system in the rapid power change can be well solved by a BMS supplementary intervention means on the premise of meeting the response speed of the system, and the long-term hidden impact damage caused by the power change can be effectively reduced or avoided.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and without being otherwise described, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the claims.
Claims (8)
1. The method for controlling the charge and discharge of the energy storage system is characterized by comprising the following steps: presetting a charging power start limit interval C related to an energy storage system c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]；
In the process of starting the charging of the energy storage system control converter, the charging power limit value P is made c— limit is at the chargingPower-on restriction interval C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c ；
The P is c Calculating according to the maximum charging power of single battery cluster units in the energy storage system, wherein P is d Calculating according to the maximum discharge power of a single battery cluster unit in the energy storage system; specific:
P c cell charge cutoff voltage cell cluster series cell number maximum allowed charge current;
P d cell discharge cut-off voltage cell cluster series cell maximum allowed discharge current.
2. The method of claim 1, further comprising:
presetting a charging power fluctuation limit interval C related to an energy storage system c2 Discharge power start limit section C d2 ，C c2 ＝[P cmax ，P c ]，C d2 ＝[P d ，P dmax ]；
Controlling current transformation in an energy storage systemWhen the device is switched from discharging to charging, the charging power limit value P is set c— limit is equal to rated charge power limit value P cmax And limit the discharge power to a value P d— Limit is P d ；
When the energy storage system controls the converter to switch from charging to discharging, the discharging power limit value P is set d— limit is equal to rated discharge power limit value P dmax And limit the charging power to P c— Limit is P c 。
3. The method for controlling charge and discharge of an energy storage system according to claim 1, wherein the battery cell charge cut-off voltage has a value ranging from [3.6 to 3.7V ]; the value range of the discharge cut-off voltage of the single battery is 2.5-2.7V, and the value range of the serial connection electric core number of the battery cluster is 1-40; and obtaining the maximum allowable charging current of the battery cell and the maximum allowable discharging current of the battery cell according to the parameters of the battery cell.
4. The method for controlling charge and discharge of an energy storage system according to claim 1, wherein in the process of controlling the converter to start charging and starting discharging by the energy storage system, the preset gradient progression is d,0<d is less than or equal to 10;
in the process of starting charging of the energy storage system control converter, the charging power limit value P c— The stepwise change of limit is (0-P) c )/d；
In the process of starting discharge of the energy storage system control converter, the charging power limit value P d— The stepwise change of limit was (P d -0)/d。
5. The method of claim 4, wherein the gradient of each stage is limited for a duration d t D is 10ms less than or equal to d t ≤1000ms。
6. The method according to claim 1, wherein the actual charging power P is during the charging process of the energy storage system control converter rc Close to P c The method comprises the following steps:
98％|P c |≤|P rc |≤102％|P c |；
in the process of starting discharge of the energy storage system control converter, the actual discharge power P rd Close to P d The method comprises the following steps:
98％P d ≤P rd ≤102％P d 。
7. the method of claim 1, wherein the energy storage system is preset with a charge power boundary protection value P c— out and discharge Power boundary protection value P d— out, charging Power Limit value P c— limit＝P c— out∧P c— limit, discharge power limit value P d— limit＝P d— out∧P d— limit。
8. The charge and discharge control system of the energy storage system is characterized by comprising an energy management system, a converter and a battery management system which are connected in a communication mode;
the battery management system is preset with a charging power start limit section C related to the energy storage system c1 Discharge power start limit section C d1 ，C c1 ＝[P c ，0]，C d1 ＝[0，P d ]；
In the process of starting the charging of the energy storage system control converter, the charging power limit value P is made c— limit is within the charging power start limit section C c1 The inner part is changed step by step according to a preset gradient, and in the limit maintaining time of each gradient, the converter is enabled to be according to the corresponding charging power limit value P c— limit charging up to the actual charging power P rc Close to P c When the charging power limit value P corresponding to the gradient is located c— limit is used as rated charging power to charge and limit the discharging power to P d— Limit is P d ；
In the process of starting discharge of the energy storage system control converter, the discharge power limit value P is made d— limit is within the discharge power start limit interval C d1 The internal is changed step by step according to the preset gradient, and the converter is enabled to be controlled according to the corresponding discharge power limit value P in the limit maintaining time of each grade of gradient d— limit discharge to actual discharge power P rd Close to P d At the time, the discharge power limit value P corresponding to the gradient d— limit is used as rated discharge power to discharge and limit the charging power to P c— Limit is P c ；
The P is c Calculating according to the maximum charging power of single battery cluster units in the energy storage system, wherein P is d Calculating according to the maximum discharge power of a single battery cluster unit in the energy storage system; specific:
P c cell charge cutoff voltage cell cluster series cell number maximum allowed charge current;
P d cell discharge cut-off voltage cell cluster series cell maximum allowed discharge current.
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