Power system grid structure reconfiguration and optimization method based on fuzzy chance constraint

Abstract

The invention relates to a power system grid structure reconfiguration and optimization method based on fuzzy chance constraints, which belongs to the field of power system security defense and restoration control. The power system grid structure reconfiguration and optimization method comprises a grid structure reconfiguration and optimization model establishing module and a grid structure reconfiguration and optimization algorithm module. The power system grid structure reconfiguration and optimization method adopts triangular fuzzy variables for representing line operation time and restoration reliability, defines an restoration reliability index for evaluating performance of a target grid structure, considers unit start-up time limit, establishes a grid structure reconfiguration and optimization model based on fuzzy chance constraints under the framework of the fuzzy chance constraints, adopts a solution method of combining fuzzy simulation, a crossed particle swarm optimization algorithm and a Dijkstra algorithm, optimizes and determines unit start-up sequence, and reconfigures a restoration grid structure with shortest reconfiguration time and highest reliability. According to the power system grid structure reconfiguration and optimization method based on fuzzy chance constraints, the fuzziness of operation time and restoration reliability when the line is put into operation at the grid structure reconfiguration stage is reasonably considered, the optimized and determined optimal grid structure reconfiguration scheme takes both system reconfiguration speed and safety requirements into account, and the power system grid structure reconfiguration and optimization method has more practical significance.

Description

technical field [0001] The invention relates to a power system grid reconfiguration optimization method based on fuzzy chance constraints, which belongs to the field of power system safety defense and recovery control. technical background [0002] The frequent blackouts in recent years show that blackouts are a serious threat to modern power systems. With the increasing scale of the power system and the continuous improvement of society's dependence on power supply, the consequences of blackouts are becoming more and more serious. The main task of the network structure reconstruction stage is to make full use of the isolated small systems restored in the previous stage, select the appropriate combination of power stations and lines to be restored and determine the corresponding order of operation, transmit power to important power stations as soon as possible and gradually establish Stable grid structure. The quality of system recovery in the stage of network structure re...

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Problems solved by technology

Similarly, the recovery reliability of the line when it is put into operation is also uncertain. Different line combinations cause the overall recovery reliability of the target grid to be different. Based on the consideration of system security, we often hope that the formed target grid has a high reliability. Reliability, there is little research on this aspect before

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