CN-121395431-B - Energy storage control method and device for new energy station, electronic equipment and storage medium

CN121395431BCN 121395431 BCN121395431 BCN 121395431BCN-121395431-B

Abstract

The invention relates to the technical field of energy storage, and discloses an energy storage control method, an energy storage control device, electronic equipment and a storage medium of a new energy station, wherein the method comprises the steps of obtaining the voltage variation and the frequency variation rate of a power grid accessed by the new energy station; the method comprises the steps of carrying out power compensation on a new energy station based on reactive power provided by an inertia flywheel if the voltage variation of a power grid is larger than a voltage variation threshold value, adjusting the voltage variation to be within the voltage variation threshold value range, obtaining station demand power of the new energy station, the current charge state and the upper limit of charge and discharge power of the inertia flywheel and a first power relation between the station demand power and the upper limit of charge and discharge power of the inertia flywheel if the frequency variation of the power grid is larger than the frequency variation threshold value, and carrying out energy storage control on the new energy station based on the station demand power, the first power relation and the current charge state of the inertia flywheel.

Inventors

YAN XINRONG
RUAN HUIFENG
XIE TINGTING
NING CHUNYUAN
SUN XIAOYONG
Wen Qiangyu
XIE YURONG
GAO CONGZHE
LI XINXUAN
XU FAN
ZHANG HAIZHEN
XU XUEFENG
LIU LILI

Assignees

华电电力科学研究院有限公司
中国绿发投资集团有限公司
北京理工大学

Dates

Publication Date: 20260508
Application Date: 20251219

Claims (9)

1. An energy storage control method of a new energy station, which is characterized by comprising the following steps: acquiring the voltage variation and the frequency variation rate of a power grid accessed by a new energy station; if the voltage variation of the power grid is larger than a voltage variation threshold, performing power compensation on the new energy station based on reactive power provided by an inertia flywheel so as to adjust the voltage variation to be within the voltage variation threshold; If the frequency change rate of the power grid is larger than a frequency change rate threshold value, obtaining station demand power of the new energy station, the current charge state of the inertia flywheel, a charging and discharging power upper limit and a first power relation between the station demand power and the charging and discharging power upper limit of the inertia flywheel; Performing energy storage control on the new energy station based on the station required power, the first power relation and the current charge state of the inertia flywheel; Receiving a frequency modulation instruction for frequency modulation of the new energy station, and acquiring a current charge state and high-speed charge and discharge power upper limit of a high-speed flywheel, a current charge state and energy storage charge and discharge power upper limit of electrochemical energy storage, a second power relation between station demand power and charge and discharge power upper limit and high-speed charge and discharge power upper limit of an inertia flywheel, and a third power relation between station demand power and high-speed charge and discharge power upper limit and energy storage charge and discharge power upper limit; Performing energy storage control on the new energy station based on the station required power, the second power relation, the third power relation, the current state of charge of the high-speed flywheel, and the current state of charge of electrochemical energy storage; the energy storage control of the new energy station based on the station demand power, the second power relationship, the third power relationship, the current state of charge of the high-speed flywheel, and the current state of charge of electrochemical energy storage includes: If the second power relation represents that the station required power is smaller than or equal to the upper limit of the high-speed charge-discharge power and the current charge state of the high-speed flywheel is in a second charge state range, controlling the high-speed flywheel based on the station required power, and performing secondary frequency modulation on the charge-discharge power of the new energy station so as to adjust the frequency of a power grid to a target frequency; And if the second power relation characterizes that the station required power is larger than the high-speed charge-discharge power upper limit, the third power relation characterizes that the station required power is smaller than or equal to the sum of the high-speed charge-discharge power upper limit and the energy storage charge-discharge power upper limit, the current state of charge of the high-speed flywheel is in a second state of charge range, and the current state of charge of the electrochemical energy storage is in a third state of charge range, controlling the high-speed flywheel to perform secondary frequency modulation on the new energy station and perform supplementary frequency modulation on station required power exceeding the second state of charge range by the electrochemical energy storage so as to adjust the frequency of the power grid to the target frequency.
2. The method of claim 1, wherein the energy storage control of the new energy station based on the station demand power, the first power relationship, and the current state of charge of the inertia flywheel comprises: And if the first power relation characterizes that the station required power is smaller than or equal to the upper limit of the charge and discharge power of the inertia flywheel and the current charge state of the inertia flywheel is in a first charge state range, controlling the inertia flywheel to carry out inertia support on the new energy station based on the station required power so as to enable the frequency change rate of the power grid to be equal to zero.
3. The method of claim 2, wherein the energy storage control of the new energy station based on the station demand power, the first power relationship, and the current state of charge of the inertia flywheel, further comprises: and if the first power relation represents that the station required power is larger than the upper limit of the charge and discharge power of the inertia flywheel, but the current charge state of the inertia flywheel is in the first charge state range, controlling the inertia flywheel to carry out inertia support on the new energy station by the upper limit of the charge and discharge power of the inertia flywheel, and giving up inertia support on the station required power exceeding the first charge state range.
4. The method according to claim 1, wherein the method further comprises: acquiring the frequency variation of a power grid accessed by a new energy station; If the frequency variation of the power grid is larger than the frequency variation threshold, acquiring the current charge state of the high-speed flywheel, the upper limit of high-speed charge and discharge power, and a second power relation between the station demand power and the upper limit of charge and discharge power and the upper limit of high-speed charge and discharge power of the inertia flywheel; And performing energy storage control on the new energy station based on the station required power, the first power relation, the second power relation, the current charge state of the inertia flywheel and the current charge state of the high-speed flywheel.
5. The method of claim 4, wherein the energy storage control of the new energy station based on the station demand power, the first power relationship, the second power relationship, the current state of charge of the inertia flywheel, and the current state of charge of the high speed flywheel comprises: If the first power relation indicates that the station required power is smaller than or equal to the upper limit of the charge and discharge power of the inertia flywheel and the current charge state of the inertia flywheel is in a first charge state range, controlling the inertia flywheel based on the station required power, and performing primary frequency modulation on the charge and discharge power of the new energy station so as to adjust the frequency of a power grid to a target frequency; If the first power relation indicates that the station required power is larger than the upper limit of the charging and discharging power of the inertia flywheel, the second power relation indicates that the station required power is smaller than or equal to the sum of the upper limit of the charging and discharging power of the inertia flywheel and the upper limit of the high-speed charging and discharging power, the current state of charge of the inertia flywheel is in a first state of charge range, and the current state of charge of the high-speed flywheel is in a second state of charge range, the inertia flywheel is controlled to perform primary frequency modulation on the new energy station by the upper limit of the charging and discharging power of the inertia flywheel, and the station required power exceeding the first state of charge range is subjected to supplementary frequency modulation by the high-speed flywheel so as to adjust the frequency of the power grid to the target frequency; And if the second power relation represents that the station required power is larger than the sum of the upper limit of the charge and discharge power of the inertia flywheel and the upper limit of the high-speed charge and discharge power, the current charge state of the inertia flywheel is in a first charge state range, and the current charge state of the high-speed flywheel is in a second charge state range, controlling the inertia flywheel to perform primary frequency modulation and control on the new energy station by the upper limit of the charge and discharge power of the inertia flywheel and the upper limit of the high-speed charge and discharge power, and giving up primary frequency modulation support on the station required power exceeding the sum of the first charge state range and the second charge state range.
6. The method of claim 1, wherein the energy storage control of the new energy station based on the station demand power, the second power relationship, the third power relationship, the current state of charge of the high speed flywheel, and the current state of charge of the electrochemical energy storage comprises: And if the third power relation characterizes that the required power of the station is larger than the sum of the upper limit of the high-speed charge-discharge power and the upper limit of the energy storage charge-discharge power, the current charge state of the high-speed flywheel is in a second charge state range, and the current charge state of the electrochemical energy storage is in a third charge state range, controlling the high-speed flywheel to carry out secondary frequency modulation and control on the new energy station by the upper limit of the high-speed charge-discharge power and the upper limit of the energy storage charge-discharge power, and giving up secondary frequency modulation support on the required power of the station exceeding the sum of the second charge state range and the third charge state range.
7. An energy storage control device for a new energy station, the device comprising: the change acquisition module is used for acquiring the voltage change and the frequency change rate of the power grid accessed by the new energy station; the voltage compensation module is used for carrying out power compensation on the new energy station based on reactive power provided by the inertia flywheel if the voltage variation of the power grid is larger than a voltage variation threshold value so as to adjust the voltage variation to be within the voltage variation threshold value range; The relation acquisition module is used for acquiring station required power of the new energy station, the current charge state of the inertia flywheel, the upper limit of charge and discharge power of the inertia flywheel and a first power relation between the station required power and the upper limit of charge and discharge power of the inertia flywheel if the frequency change rate of the power grid is larger than a frequency change rate threshold; The energy storage control module is used for carrying out energy storage control on the new energy station based on the station required power, the first power relation and the current charge state of the inertia flywheel, receiving a frequency modulation instruction for carrying out frequency modulation on the new energy station, acquiring the current charge state and the high-speed charge and discharge power upper limit of the high-speed flywheel, the current charge state and the energy storage charge and discharge power upper limit of electrochemical energy storage, a second power relation between the station required power and the charge and discharge power upper limit and the high-speed charge and discharge power upper limit of the inertia flywheel and a third power relation between the station required power and the high-speed charge and discharge power upper limit and the energy storage charge and discharge power upper limit, and carrying out energy storage control on the new energy station based on the station required power, the second power relation, the third power relation, the current charge state of the high-speed flywheel and the current charge state of electrochemical energy storage, and comprises the following steps: If the second power relation represents that the station required power is smaller than or equal to the upper limit of the high-speed charge-discharge power and the current charge state of the high-speed flywheel is in a second charge state range, controlling the high-speed flywheel based on the station required power, and performing secondary frequency modulation on the charge-discharge power of the new energy station so as to adjust the frequency of a power grid to a target frequency; And if the second power relation characterizes that the station required power is larger than the high-speed charge-discharge power upper limit, the third power relation characterizes that the station required power is smaller than or equal to the sum of the high-speed charge-discharge power upper limit and the energy storage charge-discharge power upper limit, the current state of charge of the high-speed flywheel is in a second state of charge range, and the current state of charge of the electrochemical energy storage is in a third state of charge range, controlling the high-speed flywheel to perform secondary frequency modulation on the new energy station and perform supplementary frequency modulation on station required power exceeding the second state of charge range by the electrochemical energy storage so as to adjust the frequency of the power grid to the target frequency.
8. An electronic device, comprising: A memory and a processor in communication with each other, the memory having stored therein computer instructions which, upon execution, cause the processor to perform the method of any of claims 1 to 6.
9. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1 to 6.

Description

Energy storage control method and device for new energy station, electronic equipment and storage medium Technical Field The invention relates to the technical field of energy storage, in particular to an energy storage control method and device of a new energy station, electronic equipment and a storage medium. Background With the rapid development of renewable energy sources, the duty ratio of new energy stations (such as photovoltaic power stations and wind farms) in power systems is increasing. However, new energy generation has significant intermittence and volatility, resulting in challenges in grid stability. The energy storage system is used as a key supporting technology, can effectively stabilize power fluctuation, improve electric energy quality and realize peak clipping and valley filling. However, the energy storage control method in the related art generally adopts a preset charging and discharging strategy, and is difficult to adapt to disturbance of the power grid on a time scale, so that stable operation of the power grid is affected. Disclosure of Invention The invention provides an energy storage control method, an energy storage control device, electronic equipment and a storage medium of a new energy station, and aims to solve the problem that the energy storage control method in the related art generally adopts a preset charge-discharge strategy, is difficult to adapt to disturbance of a power grid on a time scale, and accordingly affects stable operation of the power grid. In a first aspect, the present invention provides an energy storage control method for a new energy station, including: acquiring the voltage variation and the frequency variation rate of a power grid accessed by a new energy station; If the voltage variation of the power grid is larger than the voltage variation threshold, performing power compensation on the new energy station based on reactive power provided by the inertia flywheel so as to adjust the voltage variation to be within the voltage variation threshold; if the frequency change rate of the power grid is larger than the frequency change rate threshold, obtaining the station demand power of the new energy station, the current charge state of the inertia flywheel, the upper limit of the charge and discharge power of the inertia flywheel and the first power relation between the station demand power and the upper limit of the charge and discharge power of the inertia flywheel; and performing energy storage control on the new energy station based on the station required power, the first power relation and the current charge state of the inertia flywheel. According to the energy storage control method for the new energy station, the voltage variation and the frequency variation rate of the power grid are obtained in real time, and the power compensation is dynamically triggered based on the preset threshold, so that the fluctuation of the new energy station can be effectively adapted, the running stability of the power grid is remarkably improved, and the capacity of the new energy station for coping with multi-time scale disturbance of the power grid, particularly the capacity of suppressing frequency fluctuation of an extremely short time scale (millisecond-second level), is remarkably improved by carrying out energy storage control by combining the current state of charge and the power relation of the inertia flywheel. In an alternative embodiment, the energy storage control of the new energy station based on the station demand power, the first power relationship, and the current state of charge of the inertia flywheel comprises: if the first power relation characterizes that the station required power is smaller than or equal to the upper limit of the charge and discharge power of the inertia flywheel and the current state of charge of the inertia flywheel is in the first state of charge range, the inertia flywheel is controlled to support the inertia of the new energy station based on the station required power, so that the frequency change rate of the power grid is equal to zero. The energy storage control method of the new energy station can respond and control the inertia flywheel to perform power compensation in real time when the frequency of the power grid fluctuates, effectively inhibit frequency change, ensure that the frequency of the power grid is stabilized near zero, simultaneously, avoid the overcharge or overdischarge of the flywheel by combining with the dynamic judgment of the current state of charge, obviously improve the reliability and service life of an energy storage system, and further enhance the rapid inhibition capability of the new energy station on the frequency disturbance of extremely short time scale (millisecond-second level), and improve the integral anti-interference performance of the new energy station and the operation safety of the power grid. In an alternative embodiment, the energy storage control is performed on the