CN-122026434-A - Reactive compensation control system and method for receiving-end power grid and computer storage medium

CN122026434ACN 122026434 ACN122026434 ACN 122026434ACN-122026434-A

Abstract

The application discloses a reactive compensation control system of a receiving end power grid, which comprises a measurement sampling unit, a superconducting phase regulator, a static synchronous compensator and a cooperative control module, wherein the reactive compensation control system is controlled to enter a fault support mode under the condition that the voltage of a bus at a grid-connected point is smaller than the voltage lower limit of a preset dead zone, the reactive compensation control system takes the superconducting phase regulator as a leading reactive power source and provides dynamic reactive support in cooperation with the static synchronous compensator under the fault support mode so as to reduce voltage drop and promote voltage recovery, the reactive compensation control system is controlled to enter a recovery suppression mode under the condition that the voltage of the bus at the grid-connected point is greater than the voltage upper limit of the preset dead zone, and the reactive compensation control system takes the static synchronous compensator as a leading execution reactive power absorption instruction under the recovery suppression mode so as to suppress voltage overshoot. The system combines voltage sag support and voltage overshoot suppression through the sectional coordination of the superconducting tuner and the static synchronous compensator.

Inventors

FANG YOUTONG
ZHU HAOYI
MA JIEN
Shou Jiabo
ZHANG JIANCHENG
QIU LIN
SHEN HAOCONG

Assignees

浙江大学

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1.A reactive compensation control system for a receiving-side power grid, the reactive compensation control system comprising: The measurement sampling unit is used for sampling the voltage of the grid-connected point bus; the superconducting phase regulator is electrically connected with the grid-connected point bus; The static synchronous compensator is electrically connected with the grid-connected point bus; a cooperative control module configured to control the grid-tie point bus voltage, Under the condition that the busbar voltage of the grid-connected point is smaller than the voltage lower limit of a preset dead zone, controlling the reactive compensation control system to enter a fault support mode, and under the fault support mode, using the superconducting phase regulator as a leading reactive power source, and providing dynamic reactive support in cooperation with the static synchronous compensator by the reactive compensation control system so as to reduce voltage drop and promote voltage recovery; And under the condition that the bus voltage of the grid-connected point is larger than the voltage upper limit of a preset dead zone, controlling the reactive compensation control system to enter a recovery suppression mode, and under the recovery suppression mode, executing a reactive absorption instruction by using the static synchronous compensator as a main component to suppress voltage overshoot by the reactive compensation control system.
2. The reactive compensation control system of claim 1, wherein, Under the condition that the grid-connected point bus voltage is in a preset dead zone, controlling the reactive compensation control system to enter a steady-state mode, under the steady-state mode, using the static synchronous compensator as reactive regulation main equipment by the reactive compensation control system, And the superconducting phase-tuning machine starts a reactive output limiting strategy in the steady state mode, and limits the reactive output of the superconducting phase-tuning machine within a preset range.
3. The reactive compensation control system of claim 2, wherein, The cooperative control module adopts a mode of combining Q-V droop control and voltage closed loop, and generates a reactive power regulation instruction of the static synchronous compensator according to the following steps: The cooperative control module acquires a reactive power measured value currently output or absorbed by the static synchronous compensator and a per unit value of the grid-connected point bus voltage; The cooperative control module performs per unit on the reactive power measured value according to the rated capacity of the static synchronous compensator to obtain a reactive power per unit value; the cooperative control module performs voltage value taking according to the minimum value lower limit of the preset grid-connected point bus voltage per unit value, and calculates droop compensation quantity according to a preset droop coefficient based on the value taking voltage and the reactive power per unit value; the cooperative control module superimposes the per unit value of the grid-connected point bus voltage with the sagging compensation quantity to obtain a voltage control quantity; The cooperative control module filters and shapes the voltage control quantity to obtain a smooth voltage signal; the cooperative control module compares the smooth voltage signal with a preset reference voltage to obtain a voltage error, and inputs the voltage error after lead-lag compensation into a PI regulator to generate a reactive power regulation instruction of the static synchronous compensator; The droop coefficient of the static synchronous compensator, the filtering time constant for filtering and shaping the voltage control quantity and the upper limit of the reactive power change rate of the static synchronous compensator are adjusted according to the mode of the reactive compensation control system.
4. A reactive compensation control system according to claim 3, characterized in that, In the fault support mode, the reactive compensation control system uses the superconducting phase regulator as a dominant reactive power source to provide dynamic reactive support in cooperation with the static synchronous compensator, and the reactive compensation control system comprises: the reactive amplitude limiting parameter of the superconducting shunting machine is adjusted to be a first amplitude limiting, the first amplitude limiting is larger than a second amplitude limiting, the second amplitude limiting is the reactive amplitude limiting parameter of the superconducting shunting machine in the steady state mode, and the upper limit of the exciting current change rate of the superconducting shunting machine is set to be positively related to a superconducting margin index; And setting the upper limit of the reactive power change rate and the droop coefficient of the static synchronous compensator to be higher than corresponding parameters in a steady state mode, and setting the filtering time constant to be lower than the filtering time constant in the steady state mode.
5. The reactive compensation control system of claim 4, wherein, In the recovery suppression mode, the reactive compensation control system performs an absorption reactive instruction to suppress voltage overshoot based on the static synchronous compensator, including: The reactive amplitude limiting parameter of the superconducting phase-change regulator is regulated to be a third amplitude limit, the third amplitude limit is smaller than the first amplitude limit and larger than the second amplitude limit, and the upper limit of the exciting current change rate of the superconducting phase-change regulator is between the upper limit of the exciting current change rate of a steady-state mode and the upper limit of the exciting current change rate of a fault support mode, wherein the upper limit of the exciting current change rate is set to be an asymmetric constraint, the upper limit of the larger exciting current change rate is set in the retreating direction, and the upper limit of the smaller exciting current change rate is set in the exciting lifting direction; and setting the droop coefficient, the filtering time constant and the reactive power change rate upper limit of the static synchronous compensator to be between corresponding parameters of a steady state mode and a fault mode, setting the reactive power change rate upper limit to be asymmetric constraint, setting a larger reactive power change rate upper limit in the reactive power absorption direction, and setting a smaller reactive power change rate upper limit in the reactive power output direction.
6. The reactive compensation control system of claim 5, wherein, The upper limit of the exciting current change rate in the shunt direction is positively correlated with the overvoltage degree and the superconducting margin index.
7. The reactive compensation control system of claim 5, wherein, The upper limit of the exciting current change rate in the ascending direction is positively correlated with the reactive output of the static synchronous compensator and negatively correlated with the superconducting margin index.
8. The reactive compensation control system of claim 4, wherein, The reactive compensation control system further comprises a superconducting margin monitoring module, wherein the superconducting margin monitoring module is used for monitoring the superconducting camera to generate a superconducting margin index, and the smaller the superconducting margin index is, the closer the superconducting camera is to quench; The superconducting margin monitoring module monitors the winding temperature and the magnetic field intensity of the superconducting phase-change machine excitation circuit on line, dynamically calculates an excitation current upper limit, and generates the superconducting margin index according to the excitation current upper limit and the critical quench current, wherein the superconducting margin index and the excitation current upper limit are in negative correlation.
9. A reactive compensation control method, characterized in that the reactive compensation control method applies the reactive compensation control system according to any one of claims 1 to 8, the reactive compensation control method comprising: The reactive compensation control system comprises a reactive compensation control system, a grid-connected point bus voltage acquisition module, a reactive compensation control system and a steady-state mode, wherein the reactive compensation control system is controlled to enter a fault support mode under the condition that the grid-connected point bus voltage is smaller than the voltage lower limit of a preset dead zone, the reactive compensation control system is controlled to enter a recovery suppression mode under the condition that the grid-connected point bus voltage is larger than the voltage upper limit of the preset dead zone, and the reactive compensation control system is controlled to enter the steady-state mode under the condition that the grid-connected point bus voltage is within the preset dead zone.
10. A computer storage medium, characterized in that the computer storage medium stores a processing program which, when run, performs the reactive compensation control method according to claim 9.

Description

Reactive compensation control system and method for receiving-end power grid and computer storage medium Technical Field The application relates to the technical field of reactive power compensation of power systems, in particular to a reactive power compensation control system and method of a receiving end power grid and a computer storage medium. Background When a power grid has a short circuit fault, the voltage presents a double-stage characteristic of transient deep drop of the fault and voltage overshoot oscillation after fault removal, and a single reactive compensation device is difficult to simultaneously consider high-capacity transient reactive injection and millisecond-level rapid reactive absorption. The superconductive camera has the characteristics of high-efficiency regulation capability, high response speed and high mechanical inertia, and the static synchronous compensator has the characteristics of high response speed and good economy. Strategies such as transient overvoltage suppression by coordination of a phase shifter and SVC have been proposed in the prior art, but most of phase shifters in the prior art are conventional synchronous phase shifters, the reactive power supporting capacity of the phase shifter is limited by excitation loss and an adjusting range, the dynamic reactive power margin is insufficient in the moment of failure, and clear master-slave switching and priority constraint are absent in a voltage recovery stage after failure removal, reactive power homodromous superposition or overcompensation is easy to occur, and the overshoot suppression effect is unstable. Disclosure of Invention The embodiment of the application provides a reactive compensation control system, a reactive compensation control method and a computer storage medium of a receiving-end power grid. In a first aspect, the present application provides a reactive compensation control system for a receiving-end power grid, including: The measurement sampling unit is used for sampling the voltage of the grid-connected point bus; the superconducting phase adjuster is electrically connected with the grid-connected point bus; The static synchronous compensator is electrically connected with the grid-connected point bus; a cooperative control module configured to control the grid-tie point bus voltage, Under the condition that the busbar voltage of the grid-connected point is smaller than the voltage lower limit of a preset dead zone, controlling the reactive compensation control system to enter a fault support mode, and under the fault support mode, using a superconducting phase regulator as a leading reactive power source to provide dynamic reactive support in cooperation with a static synchronous compensator by the reactive compensation control system so as to reduce voltage drop and promote voltage recovery; And under the condition that the bus voltage of the grid-connected point is larger than the voltage upper limit of a preset dead zone, controlling the reactive compensation control system to enter a recovery suppression mode, and under the recovery suppression mode, executing a reactive absorption instruction by the reactive compensation control system with the static synchronous compensator as a main component so as to suppress voltage overshoot. In one embodiment, the reactive compensation control system is controlled to enter a steady state mode under the condition that the bus voltage of the grid-connected point is within a preset dead zone, and the reactive compensation control system takes a static synchronous compensator as reactive regulation main equipment in the steady state mode, And, the superconducting phase-change memory enables the reactive output limiting strategy in the steady state mode, limit the reactive output of the superconducting phase-change memory within the preset range. In one embodiment, the cooperative control module generates the reactive power regulation command of the static synchronous compensator by combining the Q-V droop control and the voltage closed loop according to the following steps: The cooperative control module acquires a reactive power measured value currently output or absorbed by the static synchronous compensator and a per unit value of the busbar voltage of the grid-connected point; the cooperative control module performs per unit on the reactive power measured value according to the rated capacity of the static synchronous compensator to obtain a reactive power per unit value; The cooperative control module performs voltage value taking according to the minimum value lower limit of the preset grid-connected point bus voltage per unit value, and calculates droop compensation quantity according to the preset droop coefficient based on the value taking voltage and reactive power per unit value; The cooperative control module superimposes the per unit value of the busbar voltage of the grid-connected point and the sagging compensation quantity to obtain a