CN-121995789-A - Semi-physical test method and device for grid-structured energy storage device control system

CN121995789ACN 121995789 ACN121995789 ACN 121995789ACN-121995789-A

Abstract

The invention discloses a semi-physical test method and device for a grid-structured energy storage device control system. The method is executed on a semi-physical test platform comprising a network-structured energy storage device control system and an energy storage converter physical hardware loop, and concretely comprises the steps of gradually carrying out no-load voltage step response test and voltage closed-loop control test on the network-structured energy storage device control system to obtain no-load test results, gradually carrying out active closed-loop control test, primary frequency modulation test, inertia test and damping control test on the network-structured energy storage device control system to obtain load test results, and determining the performance of the network-structured energy storage device control system according to the no-load test results and the load test results.

Inventors

MA XIAOGUANG
ZHANG JIAN
CHEN XIAO
WEI WEI
DENG GUOXIN
YANG CHAO
GAO PENGFEI
JIA YUAN
WU QIANYU
TI BAOZHONG
YU DAHAI
ZHAO CHONGBIN
AI DONGPING
ZHAO FENG
HE FENGJUN
ZENG BING
WANG HUI
TAN BEISI

Assignees

中国电力科学研究院有限公司
国家电网有限公司华北分部
国网冀北电力有限公司技能培训中心

Dates

Publication Date: 20260508
Application Date: 20260115

Claims (15)

1. The semi-physical test method of the network-structured energy storage device control system is characterized by being executed on a semi-physical test platform comprising a network-structured energy storage device control system and an energy storage converter physical hardware loop, and specifically comprises the following steps: Gradually carrying out no-load voltage step response test and voltage closed-loop control test on the network-structured energy storage equipment control system to obtain no-load test results; performing active closed loop control test, primary frequency modulation test, inertia test and damping control test on the network-structured energy storage equipment control system step by step to obtain a load test result; And determining the performance of the network-structured energy storage equipment control system according to the idle test result and the load test result.
2. The method of claim 1, wherein the step of testing the no-load voltage step response comprises: in the off-grid state, controlling the energy storage converter to output rated voltage; changing a voltage set point through the network-structured energy storage equipment, and performing voltage step of +/-5% relative to rated voltage; and recording the voltage waveform of the end part of the energy storage converter so as to verify the voltage closed-loop control function and the voltage rise time regulating capability.
3. The method of claim 1, wherein the voltage closed loop control testing step comprises: setting a voltage change rate through the grid-structured energy storage device in an off-grid state; Regulating the voltage of the machine end of the energy storage converter from 0% to 110% of rated voltage, then from 110% to 0% of rated voltage, performing step change at intervals of 10% of the rated voltage, and stabilizing the set time length at each point; the whole regulating process is recorded to verify the continuous regulating precision and control strategy of the voltage closed loop.
4. The method according to claim 1, wherein the active closed loop control test specifically comprises: setting an active change rate in a grid-connected state; under the charging or discharging working condition, the energy storage converter is controlled to adjust the output active power from zero to rated power, then the power is changed in a step mode from the rated power to zero at intervals of 25% of the rated active power, and the time length is set stably at each point; The whole regulating process is recorded to verify the continuous regulating precision and control strategy of the active closed loop.
5. The method according to claim 1, wherein the primary frequency modulation test specifically comprises: When the primary frequency modulation function of the energy storage converter is input in a grid-connected state, under different working conditions of charging or discharging, frequency step of +/-0.1 Hz and +/-0.2 Hz is applied to a frequency given value through the grid-structured energy storage equipment control system; And recording the change process of the frequency and the active power to verify whether the primary frequency modulation response capability of the grid-structured energy storage device control system meets a preset standard.
6. The method of claim 1, wherein the inertia test specifically comprises: in the grid-connected state, the primary frequency modulation function is exited, and the energy storage converter initially outputs rated power; Setting an inertia time constant Tj in the network-structured energy storage equipment control system; The power supply frequency of the simulation system is reduced from the rated value to a first frequency value at a constant change rate, is recovered to the rated value after being maintained for a period of time, is increased from the rated value to a second frequency value, and is recovered to the rated value after being maintained for a period of time; changing the set value of the inertia time constant, and repeating the steps; recording the adjusting process of the frequency and the active power to verify whether the change amount of the active power is in direct proportion to the inertia time constant and verify the inertia supporting capability.
7. The method of claim 6, wherein the constant rate of change is 0.5 Hz/s, the first frequency value is 49.2 Hz, the second frequency value is 50.8 Hz, and the period of time is 10 seconds.
8. The method according to claim 1, wherein the damping control test specifically comprises: Under the grid-connected state, the primary frequency modulation function is exited, so that the energy storage converter initially outputs rated power; setting a damping coefficient in the grid-structured energy storage equipment control system; Applying a three-phase voltage drop fault to a power grid model in the semi-physical test platform, and maintaining a set duration; Changing the set value of the damping coefficient, and repeating the steps; And recording grid-connected point voltage, active power and reactive power curves to verify transient stability differences of the system under different damping coefficients.
9. The method of claim 8, wherein the three-phase voltage sag fault has a duration of 0.15 seconds.
10. A semi-physical testing apparatus of a networked energy storage device control system for implementing the method of any one of claims 1-9, comprising: the first test module is used for gradually carrying out no-load voltage step response test and voltage closed-loop control test on the grid-formed energy storage equipment control system to obtain no-load test results; The second test module is used for gradually performing active closed-loop control test, primary frequency modulation test, inertia test and damping control test on the network-structured energy storage equipment control system to obtain a load test result; And the determining module is used for determining the performance of the network-structured energy storage equipment control system according to the idle test result and the load test result.
11. The apparatus of claim 10, wherein the no-load voltage step response testing step comprises: in the off-grid state, controlling the energy storage converter to output rated voltage; changing a voltage set point through the network-structured energy storage equipment, and performing voltage step of +/-5% relative to rated voltage; and recording the voltage waveform of the end part of the energy storage converter so as to verify the voltage closed-loop control function and the voltage rise time regulating capability.
12. The apparatus of claim 10, wherein the voltage closed loop control testing step comprises: setting a voltage change rate through the grid-structured energy storage device in an off-grid state; Regulating the voltage of the machine end of the energy storage converter from 0% to 110% of rated voltage, then from 110% to 0% of rated voltage, performing step change at intervals of 10% of the rated voltage, and stabilizing the set time length at each point; the whole regulating process is recorded to verify the continuous regulating precision and control strategy of the voltage closed loop.
13. The apparatus of claim 10, wherein the active closed loop control test specifically comprises: setting an active change rate in a grid-connected state; under the charging or discharging working condition, the energy storage converter is controlled to adjust the output active power from zero to rated power, then the power is changed in a step mode from the rated power to zero at intervals of 25% of the rated active power, and the time length is set stably at each point; The whole regulating process is recorded to verify the continuous regulating precision and control strategy of the active closed loop.
14. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method of any of the preceding claims 1-9.
15. An electronic device, the electronic device comprising: A processor; a memory for storing the processor-executable instructions; The processor being configured to read the executable instructions from the memory and execute the instructions to implement the method of any of the preceding claims 1-9.

Description

Semi-physical test method and device for grid-structured energy storage device control system Technical Field The invention relates to the technical field of control of network-structured energy storage equipment, in particular to a semi-physical test method and device of a network-structured energy storage equipment control system. Background The network controller is used as core technical equipment for supporting the stable operation of a novel power system, and is verified to be in a large-scale commercial stage from a test point, so that the network controller becomes a key path for coping with the grid-connection challenges of high-proportion new energy and high-proportion power electronic equipment. The method has the core value that virtual inertia, voltage support and quick frequency modulation capability are actively provided by simulating the characteristics of the synchronous generator, the pain points of the traditional grid-following type equipment, which depend on a strong power grid and have weak support capability, are broken, and new energy is promoted to be converted from 'supplementary power supply' to 'main power supply'. The existing network formation type energy storage control system has no unified knowledge or a technical route is not unique for realizing the problems of a voltage supporting mode, a controlled quantity, a control mode and the like in the industry, wherein patent No. CN 114944663B is a network formation control method and system based on a network formation type converter, and a network formation control strategy of the energy storage converter based on a synchronous generator control mode is provided, and mainly comprises functions of voltage/active closed loop, primary frequency modulation, inertia/damping control and the like, so that the energy storage converter has voltage, frequency and inertia supporting capability. How to test whether the network-structured energy storage device has the characteristics of the patent number CN 114944663B or not, and semi-physical test is needed, but the current semi-physical test method is not mature and the running requirement of the power grid is not considered. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a semi-physical test method and device for a control system of a network-structured energy storage device. According to one aspect of the invention, a semi-physical test method of a network-structured energy storage device control system is provided, which is executed on a semi-physical test platform comprising a network-structured energy storage device control system and an energy storage converter physical hardware loop, and specifically comprises the following steps: Gradually carrying out no-load voltage step response test and voltage closed-loop control test on the network-structured energy storage equipment control system to obtain no-load test results; Gradually performing active closed-loop control test, primary frequency modulation test, inertia test and damping control test on the network-structured energy storage equipment control system to obtain a load test result; And determining the performance of the control system of the network-structured energy storage equipment according to the idle test result and the load test result. Optionally, the step of testing the no-load voltage step response comprises: in the off-grid state, controlling the energy storage converter to output rated voltage; Changing a voltage set point through a net-structured energy storage device, and performing voltage step of +/-5% relative to rated voltage; And recording the voltage waveform of the end part of the energy storage converter so as to verify the voltage closed-loop control function and the voltage rise time regulating capability. Optionally, the voltage closed-loop control testing step includes: Setting a voltage change rate through the grid-formed energy storage device in an off-grid state; Regulating the voltage of the machine end of the energy storage converter from 0% to 110% of rated voltage, then from 110% to 0% of rated voltage, performing step change at intervals of 10% of the rated voltage, and stabilizing the set time length at each point; the whole regulating process is recorded to verify the continuous regulating precision and control strategy of the voltage closed loop. Optionally, the active closed loop control test specifically includes: setting an active change rate in a grid-connected state; under the charging or discharging working condition, the energy storage converter is controlled to adjust the output active power from zero to rated power, then the power is changed in a step mode from the rated power to zero at intervals of 25% of the rated active power, and the time length is set stably at each point; The whole regulating process is recorded to verify the continuous regulating precision and control strategy of the active closed loop. Optionally, the primary frequ