CN-121984010-A - Scheduling method and system for power grid

CN121984010ACN 121984010 ACN121984010 ACN 121984010ACN-121984010-A

Abstract

The invention discloses a dispatching method and a dispatching system of a power grid, which are applied to the technical field of power grid dispatching, wherein the method comprises the steps of constructing a simulation model of a target power grid according to the topological relation of each node of the target power grid; the method comprises the steps of carrying out power flow analysis on a simulation model to obtain a power flow sensitivity factor corresponding to each node, extracting overload operation conditions of a first node in the nodes from historical operation data of a target power grid, changing electrical states of a second adjustable node in the nodes in the simulation model to obtain voltage change conditions of a third node in the nodes, determining topology influence factors of the second adjustable node according to the voltage change conditions, determining the third node by topology relations, generating a power grid scheduling scheme based on the power flow sensitivity factors, the overload operation conditions, the topology influence factors and a selected mixed integer programming model, and controlling the corresponding node of the target power grid to execute the power grid scheduling scheme. The dispatching method and the dispatching system for the power grid effectively improve the reliability of a dispatching strategy.

Inventors

FENG TENG
GU SONGLIN
LIU WENXUAN
SONG ZHUORAN
WANG DENGZHENG
SHI SONGJIE
CAI YUPENG
HAN LIU
YU TONGWEI
JU YUNTAO
ZHOU WEIPENG
ZHAO HONGYAN
DU NIANCHUN
XIAO ZHIHONG

Assignees

国网经济技术研究院有限公司
国网辽宁省电力有限公司电力科学研究院
北方工业大学

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (10)

1. A method for scheduling an electrical grid, comprising: Constructing a simulation model of a target power grid according to the topological relation of each node of the target power grid; carrying out power flow analysis on the simulation model to obtain a power flow sensitivity factor corresponding to each node; Extracting overload operation conditions of a first node in the nodes from historical operation data of the target power grid; Changing the electrical state of a second adjustable node in the nodes in the simulation model to obtain the voltage change condition of a third node in the nodes, and determining the topology influence factor of the second adjustable node according to the voltage change condition, wherein the third node is determined by the topology relation; generating a power grid dispatching scheme based on the power flow sensitivity factor, the overload operation condition, the topology influence factor and a selected mixed integer programming model; and controlling the corresponding node of the target power grid to execute the power grid dispatching scheme.
2. The method for dispatching a power grid according to claim 1, wherein said performing a power flow analysis on said simulation model to obtain a power flow sensitivity factor corresponding to each of said nodes comprises: Constructing a tide equation based on the simulation model; Solving the power flow equation by adopting a Newton-Laportson method to obtain a reference state variable of the target power grid at a reference operating point; performing first-order Taylor expansion on the tide equation at the reference operating point to obtain a linearization relation; processing the linearization relation for each node to obtain a sensitivity factor corresponding to the node; And integrating the sensitivity factors to obtain the tide sensitivity factors corresponding to each node.
3. The method for dispatching a power grid according to claim 1, wherein said extracting the overload operation condition of the first node of the nodes from the historical operation data of the target power grid comprises: analyzing the topological relation and determining the first node and an association branch of the first node; analyzing the historical operation data to determine overload operation events flowing through the association branch at each moment; And analyzing the overload operation event of the first node to determine the overload operation condition of the first node.
4. The method for dispatching a power grid according to claim 1, wherein said changing the electrical state of the second adjustable node of the nodes in the simulation model obtains the voltage change condition of the third node of the nodes, and determines the topology influence factor of the second adjustable node according to the voltage change condition, wherein the third node is determined by the topology relation, and includes: determining the second adjustable point with regulatory capability and the third node affected topologically; carrying out power flow calculation in the simulation model, and determining reference voltage values of all third nodes; changing the electrical state of the second adjustable node, and re-executing power flow calculation in the simulation model to obtain a calculation result; extracting the voltage variation of the third node from the calculation result; the topology influence factor of the second adjustable node is determined based on a ratio of the voltage variation to the reference voltage value.
5. The method of scheduling a power grid according to claim 1, wherein the generating a power grid scheduling scheme based on the power flow sensitivity factor, the overload operation condition, the topology impact factor, and a selected mixed integer programming model comprises: determining an unfolding path of a cutting plane in the process of solving the mixed integer programming model according to the tide sensitivity factor of each node; selecting a position for constructing a split cut according to the topology influencing factor; Applying an additional safety margin to the cutting plane in accordance with the violation factor; and solving the mixed integer programming model based on the cutting plane to obtain the power grid dispatching scheme.
6. A dispatching system for an electrical grid, comprising: The building module is used for building a simulation model of the target power grid according to the topological relation of each node of the target power grid; the power flow module is used for carrying out power flow analysis on the simulation model to obtain power flow sensitivity factors corresponding to each node; The overload module is used for extracting overload operation conditions of a first node in the nodes from historical operation data of the target power grid; The topology module is used for changing the electrical state of a second adjustable node in the nodes in the simulation model to obtain the voltage change condition of a third node in the nodes, and determining the topology influence factor of the second adjustable node according to the voltage change condition, wherein the third node is determined by the topology relation; The generation module is used for generating a power grid dispatching scheme based on the power flow sensitivity factor, the overload operation condition, the topology influence factor and the selected mixed integer programming model; And the execution module is used for controlling the corresponding node of the target power grid to execute the power grid dispatching scheme.
7. The power grid dispatching system of claim 6, wherein the power flow module comprises: the building unit is used for building a tide equation based on the simulation model; the reference unit is used for solving the tide equation by adopting a Newton-Laporton method to obtain a reference state variable of the target power grid at a reference operating point; The linear unit is used for performing first-order Taylor expansion on the tide equation at the reference operating point to obtain a linearization relation; the sensitivity unit is used for processing the linearization relation for each node to obtain a sensitivity factor corresponding to the node; and the integration unit is used for integrating the sensitivity factors to obtain the tide sensitivity factors corresponding to each node.
8. The scheduling system of the power grid of claim 6, wherein the overload module comprises: the analysis unit is used for analyzing the topological relation and determining the first node and an association branch of the first node; The event unit is used for analyzing the historical operation data and determining overload operation events flowing through the associated branch at all times; the condition unit is used for analyzing the overload operation event of the first node and determining the overload operation condition of the first node.
9. The scheduling system of the electrical grid of claim 6, wherein the topology module comprises: a determining unit for determining the second adjustable point with regulatory capability and the third node affected by the second adjustable point on topology; the power flow calculation unit is used for carrying out power flow calculation in the simulation model and determining reference voltage values of all third nodes; a changing unit, configured to change the electrical state of the second adjustable node, and re-execute power flow calculation in the simulation model to obtain a calculation result; an extracting unit, configured to extract a voltage variation of the third node from the calculation result; and a topology influencing unit for determining the topology influencing factor of the second adjustable node based on a ratio of the voltage variation to the reference voltage value.
10. The scheduling system of the electrical grid of claim 6, wherein the generating module comprises: the path unit is used for determining an unfolding path of a cutting plane in the process of solving the mixed integer programming model according to the tide sensitivity factor of each node; a position unit for selecting a position for constructing a split cut according to the topology influencing factor; a margin unit for applying an additional safety margin to the cutting plane according to the violation factor; and the solving unit is used for solving the mixed integer programming model based on the cutting plane to obtain the power grid dispatching scheme.

Description

Scheduling method and system for power grid Technical Field The invention relates to the technical field of power grid dispatching, in particular to a dispatching method and system of a power grid. Background The power grid system comprises a plurality of levels and forms of subsystems such as a power distribution network, a micro-grid and a transmission grid, and scheduling of each part of resources is not only beneficial to overall resource planning, improving the overall power supply reliability and new energy consumption capability, but also capable of effectively optimizing the resource utilization efficiency. In the scheduling modeling of the power distribution network, nodes are not only basic units of network topology, but also bear key electrical characteristics such as voltage level, power injection, load response and the like. However, the existing scheduling method is not comprehensive in node description, so that the generated scheduling strategy can meet given constraint conditions mathematically, but the problems of voltage out-of-limit, branch overload or non-executable control strategy can still be caused in actual operation. For example, certain scheduling schemes propose to disconnect a line to reduce the net loss when the photovoltaic power generation output is maximum, but do not fully consider the node voltage boosting effect caused by the concentrated injection of photovoltaic power in the local nodes after disconnecting the line, thereby causing the node voltage at the user side to exceed the safety limit. Therefore, the existing scheduling method is difficult to ensure the safety and the feasibility of the actual system. Disclosure of Invention The invention provides a dispatching method and a dispatching system of a power grid, which aim to solve the technical problem that the node characteristics are not comprehensive enough in consideration of the existing dispatching method, so as to achieve the effect of providing the reliability of the dispatching method. In order to solve the technical problems, the invention provides a scheduling method and a scheduling system for a power grid, wherein the method comprises the following steps: Constructing a simulation model of a target power grid according to the topological relation of each node of the target power grid; carrying out power flow analysis on the simulation model to obtain a power flow sensitivity factor corresponding to each node; Extracting overload operation conditions of a first node in the nodes from historical operation data of the target power grid; Changing the electrical state of a second adjustable node in the nodes in the simulation model to obtain the voltage change condition of a third node in the nodes, and determining the topology influence factor of the second adjustable node according to the voltage change condition, wherein the third node is determined by the topology relation; generating a power grid dispatching scheme based on the power flow sensitivity factor, the overload operation condition, the topology influence factor and a selected mixed integer programming model; and controlling the corresponding node of the target power grid to execute the power grid dispatching scheme. Preferably, the step of performing power flow analysis on the simulation model to obtain a power flow sensitivity factor corresponding to each node includes: Constructing a tide equation based on the simulation model; Solving the power flow equation by adopting a Newton-Laportson method to obtain a reference state variable of the target power grid at a reference operating point; performing first-order Taylor expansion on the tide equation at the reference operating point to obtain a linearization relation; processing the linearization relation for each node to obtain a sensitivity factor corresponding to the node; And integrating the sensitivity factors to obtain the tide sensitivity factors corresponding to each node. Preferably, the extracting the overload operation condition of the first node in the nodes from the historical operation data of the target power grid includes: analyzing the topological relation and determining the first node and an association branch of the first node; analyzing the historical operation data to determine overload operation events flowing through the association branch at each moment; And analyzing the overload operation event of the first node to determine the overload operation condition of the first node. Preferably, the changing the electrical state of the second adjustable node in the nodes in the simulation model obtains the voltage change condition of a third node in the nodes, and determines the topology influence factor of the second adjustable node according to the voltage change condition, where the third node is determined by the topology relation, and includes: determining the second adjustable point with regulatory capability and the third node affected topologically; carrying out powe