CN-121546680-B - Distributed cooperative control method and device for electrochemical energy storage system

CN121546680BCN 121546680 BCN121546680 BCN 121546680BCN-121546680-B

Abstract

The invention relates to the technical field of energy storage system control and discloses a distributed cooperative control method and device of an electrochemical energy storage system, wherein the method comprises the steps of constructing a plurality of local communication network units based on each target energy storage unit and adjacent units thereof in the energy storage system; the method comprises the steps of monitoring the charge states of all target energy storage units and the total power of an energy storage system in real time, triggering the target energy storage units to exchange state data packets with adjacent units if the change amount of the charge states of the target energy storage units exceeds a first preset threshold or the change amount of the total power exceeds a second preset threshold, calculating target power instructions based on the state data packets of the target energy storage units and the adjacent units, and sending the target power instructions to a converter of the target energy storage units so that the converter can control the charge and discharge power of the target energy storage units according to the target power instructions. The invention realizes the control of the energy storage system with reliability, high efficiency and real-time performance by a distributed architecture and a cooperative control method.

Inventors

ZHANG HAIZHEN
XIE YURONG
XIE TINGTING
LUO CHENGXIN
HUANG RONG
LI YUXUAN
ZHANG KAI

Assignees

华电电力科学研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260119

Claims (9)

1. A method for distributed cooperative control of an electrochemical energy storage system, the method comprising: Constructing a plurality of local communication network units based on each target energy storage unit and adjacent units thereof in an energy storage system, wherein the adjacent units are energy storage units which are connected with the target energy storage units through a local communication protocol; The method comprises the steps of monitoring the state of charge of each target energy storage unit and the total power of the energy storage system in real time, and triggering the target energy storage units to exchange state data packets with adjacent units of the target energy storage units if the change amount of the state of charge of the target energy storage units exceeds a first preset threshold or the change amount of the total power of the energy storage system exceeds a second preset threshold, wherein the state data packets comprise the state of charge data and the state of health data of the energy storage units; Calculating a target power instruction based on the state data packets of the target energy storage unit and adjacent units thereof; the target power instruction is issued to a converter of the target energy storage unit, so that the converter controls the charging and discharging power of the target energy storage unit according to the target power instruction; calculating a target power command based on the state data packets of the target energy storage unit and its neighboring units, comprising: Calculating the weight of each adjacent unit according to the health status data in the status data packet of each adjacent unit; Respectively calculating the charge state difference between each adjacent unit and the target energy storage unit; Carrying out weighted summation on the charge state differences corresponding to the adjacent units according to the weights of the adjacent units to obtain charge state deviation values; Determining optimized state of charge data of the target energy storage unit according to the sum of the state of charge data of the target energy storage unit and the state of charge deviation value; And calculating a target power instruction of the target energy storage unit based on the optimized state of charge data and the total power instruction.
2. The method of claim 1, wherein constructing a plurality of local communication network elements based on each target energy storage unit and its neighbors in the energy storage system comprises: each target energy storage unit broadcasts an own identity data packet, and an energy storage unit capable of receiving the own identity data packet is determined to be an adjacent unit; and constructing a neighbor information list based on the neighbor units, and initializing consistency algorithm parameters of each target energy storage unit to obtain a plurality of local communication network units, wherein the consistency algorithm parameters comprise the first preset threshold value and the second preset threshold value.
3. The method of claim 1, wherein calculating weights for each neighboring cell based on health status data in the status data packet for each neighboring cell comprises: Calculating the product of the health state data of each adjacent unit and each rated power and accumulating to obtain a normalization factor; and dividing the product of the health state data of each adjacent unit and the rated power by the normalization factor to obtain the weight of each adjacent unit.
4. The method of claim 1, wherein calculating a target power command for the energy storage unit based on the optimized state of charge data and a total power command comprises: multiplying the rated capacity of the target energy storage unit by the self health state data to obtain the available capacity of the target energy storage unit; multiplying the rated capacity of each adjacent unit with the respective health state data and summing to obtain the total available capacity of the adjacent units; dividing the available capacity of the target energy storage unit by the total available capacity of the adjacent units to obtain the available capacity duty ratio of the target energy storage unit; multiplying the available capacity duty ratio of the target energy storage unit with a total power instruction to obtain a basic allocation power value; obtaining a power regulation gain value according to the difference between the average state of charge data of the energy storage system and the optimized state of charge data; and summing the basic distribution power value and the power adjustment gain value to obtain a target power instruction of the target energy storage unit.
5. The method of claim 1, wherein after the step of calculating a target power command based on the state data packets of the target energy storage unit and the energy storage units adjacent thereto, the step of issuing the target power command to the current transformer of the target energy storage unit is preceded by the step of: Checking whether the target power instruction meets a safety check condition or not, wherein the safety check condition comprises one or more of a power check condition, a capacity matching check condition and a health state check condition; If the safety verification condition is met, the target power instruction is issued to a converter of the target energy storage unit; and if the safety verification condition is not met, adjusting the target power instruction until the target power instruction meets the safety verification condition.
6. An electrochemical energy storage system distributed cooperative control apparatus, the apparatus comprising: The communication network unit construction module is used for constructing a plurality of local communication network units based on each target energy storage unit and adjacent units thereof in the energy storage system, wherein the adjacent units are energy storage units which are connected with the target energy storage units through a local communication protocol; The real-time monitoring module is used for monitoring the state of charge of each target energy storage unit and the total power of the energy storage system in real time, and triggering the target energy storage unit to exchange a state data packet with an adjacent unit when the change amount of the state of charge of the target energy storage unit exceeds a first preset threshold or the change amount of the total power of the energy storage system exceeds a second preset threshold, wherein the state data packet comprises the state of charge data and the state of health data of the energy storage unit; the target power instruction obtaining module is configured to calculate a target power instruction based on a state data packet of a target energy storage unit and a neighboring unit thereof, and includes: Calculating the weight of each adjacent unit according to the health status data in the status data packet of each adjacent unit; Respectively calculating the charge state difference between each adjacent unit and the target energy storage unit; Carrying out weighted summation on the charge state differences corresponding to the adjacent units according to the weights of the adjacent units to obtain charge state deviation values; Determining optimized state of charge data of the target energy storage unit according to the sum of the state of charge data of the target energy storage unit and the state of charge deviation value; calculating a target power instruction of the target energy storage unit based on the optimized state of charge data and the total power instruction; And the target power instruction issuing module is used for issuing the target power instruction to the converter of the target energy storage unit so that the converter controls the charging and discharging power of the target energy storage unit according to the target power instruction.
7. An electronic device, comprising: a memory and a processor in communication with each other, the memory having stored therein computer instructions that, upon execution, perform the electrochemical energy storage system distributed cooperative control method of any of claims 1 to 5.
8. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the electrochemical energy storage system distributed co-control method of any one of claims 1 to 5.
9. A computer program product comprising computer instructions for causing a computer to perform the electrochemical energy storage system distributed cooperative control method of any of claims 1 to 5.

Description

Distributed cooperative control method and device for electrochemical energy storage system Technical Field The invention relates to the technical field of energy storage system control, in particular to a distributed cooperative control method and device for an electrochemical energy storage system. Background The existing electrochemical energy storage cluster control main flow adopts a centralized architecture, gathers real-time data of all energy storage units through a central controller, and issues power instructions to all the units after unified calculation. However, the mode has obvious short plates, on one hand, the system operation is highly dependent on a central node, once a central controller or a main communication network fails, the energy storage system is extremely easy to run away, even the safety of a power grid is threatened, and the control architecture is essentially lack of redundant design and distributed decision-making capability. On the other hand, the data such as the voltage, the current, the state of charge (SOC) and the like of all the energy storage units are required to be continuously uploaded to the central controller, the requirements on the communication bandwidth and the reliability are strict, and the construction and maintenance cost of the system is directly increased. Along with the expansion of the scale of the energy storage system, the defects of a centralized architecture are further highlighted that the number of the energy storage units is increased, so that the variable to be processed by the central controller and the constraint condition are exponentially increased, the calculation time consumption is greatly increased, and the real-time application requirements of rapid frequency modulation and the like of a power grid cannot be met. In the power distribution link, the prior art mostly adopts simple strategies such as polling, fixed proportion or master-slave, etc., and the rough scheme can not sense the real-time state of each unit, and can not carry out dynamic intelligent distribution according to the real-time state, so that the unit in an extreme state can be charged and discharged frequently and high power, and further the ageing speed imbalance of each unit is caused, and the effective service life of the energy storage system is obviously shortened. Disclosure of Invention The invention provides a distributed cooperative control method and device for an electrochemical energy storage system, which are used for solving the problem that the related energy storage control method has defects in the aspects of reliability, instantaneity, service life management and the like of the energy storage system due to a centralized control architecture. In a first aspect, the present invention provides a distributed cooperative control method for an electrochemical energy storage system, the method comprising: The method comprises the steps of constructing a plurality of local communication network units based on each target energy storage unit and adjacent units thereof in an energy storage system, wherein the adjacent units are energy storage units connected with the target energy storage units through a local communication protocol, monitoring the charge states of each target energy storage unit and the total power of the energy storage system in real time, triggering the target energy storage units to exchange state data packets with the adjacent units when the charge state change amount of each target energy storage unit exceeds a first preset threshold or the total power change amount of the energy storage system exceeds a second preset threshold, calculating a target power instruction based on the state data packets of the target energy storage units and the adjacent units, and transmitting the target power instruction to a converter of the target energy storage unit so that the converter controls the charge and discharge power of the target energy storage unit according to the target power instruction. According to the distributed cooperative control method for the electrochemical energy storage system, each target energy storage unit only builds a local communication network with the adjacent units in the communication range, so that a global communication mode of a centralized architecture is abandoned, dependence on a central controller is avoided, and the risk of out-of-control of the whole system caused by single-point faults is effectively avoided. Further, through monitoring the state of charge variation and the total power variation rate in real time, the state data packet exchange is triggered only when the state of charge variation or the total power variation rate exceeds a preset threshold value, and data is not continuously transmitted, so that the timely interaction of core information is ensured, the occupation of communication bandwidth is greatly reduced, and the resource consumption of redundant communication is reduced. The target pow