CN-122026487-A - Power grid disconnection method and system

CN122026487ACN 122026487 ACN122026487 ACN 122026487ACN-122026487-A

Abstract

The invention discloses a power grid splitting method and system, which are applied to the field of power grid control and comprise the steps of obtaining power information, power angle information, power state variables, energy output and load of a target power grid, constructing a power constraint condition based on the power information of the power generator, constructing a power angle stable constraint condition based on the power angle information of the power generator, constructing a black start constraint condition based on the power state variables, converting the opportunity constraint condition constructed based on the energy output and the load into a deterministic constraint condition, and splitting the target power grid into a plurality of independent operation partitions based on the power constraint condition, the power angle stable constraint condition, the black start constraint condition, the deterministic constraint condition and a power grid splitting target. According to the invention, deterministic multiple splitting constraint is constructed through the running state of the target power grid, and the target power grid is accurately split under the guidance of the power grid splitting target.

Inventors

LIU CHENGYUAN
GU WEI
SHEN XI
TONG CUNZHI
SU YIJING
QIAN KAIYANG
ZHANG LINQIANG
ZHAN WENDA
YIN WENZHE
LIAO PEI
SHI YUCHAO
LI XIANG
ZHONG ZHONGYU
HUANG HANJING
ZHU YINING
YE YANGLI
YANG XINGCHAO
CHEN YIFANG
WANG YUANTAO
SUN WENDUO
MO YAJUN
SU HUANGXING
Xu Shuangdie
ZHAO JIAYUE
WU HUAHUA

Assignees

国网浙江省电力有限公司杭州供电公司
国网浙江省电力有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. A method of grid disconnection, comprising: Acquiring generator power information, generator power angle information, power state variables, energy output and load of a target power grid; Constructing a power constraint condition based on the power information of the generator, constructing a power angle stability constraint condition based on the power angle information of the generator, and constructing a black start constraint condition based on the power state variable; converting the opportunity constraint conditions constructed based on the energy output and the load into deterministic constraint conditions; And splitting the target power grid into a plurality of independent operation partitions based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition and a grid splitting target.
2. The grid splitting method of claim 1, wherein the constructing a power constraint based on the generator power information comprises: Determining a generator power constraint based on the generator active limit, the generator reactive limit, and the generator adjustment rate; determining power flow constraint based on line impedance, node phase angle difference, node voltage and line on-off information of the target power grid; and integrating the power constraint of the generator and the power flow constraint to obtain a power constraint condition.
3. The grid splitting method of claim 1, wherein the constructing a power angle stability constraint based on the generator power angle information comprises: Determining generator partition constraints based on the generator rotor power angle trajectory and the generator rotor speed; determining a line flow constraint based on the generator line phase angle and the generator line impedance; and integrating and constructing the generator partition constraint and the line tide constraint to obtain a power angle stability constraint condition.
4. The grid splitting method of claim 1, wherein the constructing a black start constraint based on the power state variable comprises: Performing synchronous vector measurement on a target generator node to obtain a power state variable of the target generator node; Or determining a power state variable of a target generator node based on a synchronization vector measurement of neighboring nodes of the target generator node; based on the number of generator nodes and the power state variables, a black start constraint is constructed.
5. The grid splitting method of claim 1, wherein the translating the opportunity constraint constructed based on the energy output and the load into a deterministic constraint comprises: Determining a source load power constraint based on the output deviation, the load deviation and the generator regulation activity of each generator node; integrating the source load power constraint and a preset confidence coefficient to obtain an opportunity constraint condition; And performing multi-scene sampling processing on the opportunity constraint condition to obtain a deterministic constraint condition.
6. A grid splitting system, comprising: The acquisition module is used for acquiring generator power information, generator power angle information, power state variables, energy output and load of a target power grid; The target constraint condition construction module is used for constructing a power constraint condition based on the power information of the generator, constructing a power angle stability constraint condition based on the power angle information of the generator and constructing a black start constraint condition based on the power state variable; the deterministic constraint condition construction module is used for converting the opportunity constraint conditions constructed based on the energy output and the load into deterministic constraint conditions; and the power grid splitting module is used for splitting the target power grid into a plurality of independent operation partitions based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition and a power grid splitting target.
7. The grid splitting system of claim 6, wherein the target constraint building module comprises: a generator power constraint determination unit for determining a generator power constraint based on the generator active limit, the generator reactive limit, and the generator adjustment rate; The power flow constraint determining unit is used for determining power flow constraint based on line impedance, node phase angle difference, node voltage and line on-off information of the target power grid; the power constraint condition construction unit is used for integrating the power constraint of the generator and the power flow constraint to obtain a power constraint condition.
8. The grid splitting system of claim 6, wherein the target constraint building module further comprises: the generator partition constraint determining unit is used for determining the generator partition constraint based on the generator rotor power angle track and the generator rotor rotating speed; the line load flow constraint determining unit is used for determining line load flow constraint based on the generator line phase angle and the generator line impedance; And the power angle stability constraint condition construction unit is used for carrying out integrated construction on the generator partition constraint and the line tide constraint to obtain a power angle stability constraint condition.
9. The grid splitting system of claim 6, wherein the target constraint building module further comprises: the power state variable determining unit is used for carrying out synchronous vector measurement on a target generator node to obtain a power state variable of the target generator node; Or determining a power state variable of a target generator node based on a synchronization vector measurement of neighboring nodes of the target generator node; and the black start constraint condition construction unit is used for constructing a black start constraint condition based on the number of generator nodes and the power state variable.
10. The grid splitting system of claim 6, wherein the deterministic constraint building module comprises: the source load power constraint determining unit is used for determining source load power constraint based on the output deviation, the load deviation and the generator regulation active power of each generator node; the opportunity constraint condition construction unit is used for integrating the source load power constraint and the preset confidence coefficient to obtain an opportunity constraint condition; And the multi-scene sampling processing unit is used for performing multi-scene sampling processing on the opportunity constraint condition to obtain a deterministic constraint condition.

Description

Power grid disconnection method and system Technical Field The invention relates to the technical field of power grid control, in particular to a power grid disconnection method and system. Background Under the condition that the power grid is severely interfered, the caused faults can be rapidly diffused, so that the overall stability of the power system is affected, accurate control measures (such as power grid disconnection) are adopted according to the running state of the power system, the stability of the power system can be improved, and the fault risk of the power system is reduced. The existing power grid active disconnection method based on deterministic scheduling determines the optimal disconnection boundary by acquiring the state of the power system during oscillation in real time. However, in the face of power generation energy output with uncertainty fluctuation, the existing power grid active disconnection method based on deterministic scheduling cannot give accurate power grid disconnection measures. Disclosure of Invention The invention provides a power grid splitting method and a system, which are used for solving the technical problem that an accurate power grid splitting measure cannot be given when the power generation has the energy output with uncertainty fluctuation in the existing power grid active splitting method based on deterministic scheduling. In order to solve the above technical problems, an embodiment of the present invention provides a power grid disconnection method, including: Acquiring generator power information, generator power angle information, power state variables, energy output and load of a target power grid; Constructing a power constraint condition based on the power information of the generator, constructing a power angle stability constraint condition based on the power angle information of the generator, and constructing a black start constraint condition based on the power state variable; converting the opportunity constraint conditions constructed based on the energy output and the load into deterministic constraint conditions; And splitting the target power grid into a plurality of independent operation partitions based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition and a grid splitting target. As one preferable aspect, the constructing a power constraint condition based on the generator power information includes: Determining a generator power constraint based on the generator active limit, the generator reactive limit, and the generator adjustment rate; determining power flow constraint based on line impedance, node phase angle difference, node voltage and line on-off information of the target power grid; and integrating the power constraint of the generator and the power flow constraint to obtain a power constraint condition. As one preferable mode, the constructing the power angle stability constraint condition based on the power angle information of the generator includes: Determining generator partition constraints based on the generator rotor power angle trajectory and the generator rotor speed; determining a line flow constraint based on the generator line phase angle and the generator line impedance; and integrating and constructing the generator partition constraint and the line tide constraint to obtain a power angle stability constraint condition. As one preferable aspect, the constructing a black start constraint condition based on the power state variable includes: Performing synchronous vector measurement on a target generator node to obtain a power state variable of the target generator node; Or determining a power state variable of a target generator node based on a synchronization vector measurement of neighboring nodes of the target generator node; based on the number of generator nodes and the power state variables, a black start constraint is constructed. As one of the preferable schemes, the converting the opportunity constraint condition constructed based on the energy output and the load into the deterministic constraint condition includes: Determining a source load power constraint based on the output deviation, the load deviation and the generator regulation activity of each generator node; integrating the source load power constraint and a preset confidence coefficient to obtain an opportunity constraint condition; And performing multi-scene sampling processing on the opportunity constraint condition to obtain a deterministic constraint condition. Another embodiment of the present invention provides a power grid disconnection system, including: The acquisition module is used for acquiring generator power information, generator power angle information, power state variables, energy output and load of a target power grid; The target constraint condition construction module is used for constructing a power constraint c