Method and device for online simulation of cascading failures of grid system based on genetic algorithm

Abstract

The invention provides a method and device for online simulation of cascading failures of a grid system based on a genetic algorithm. The method includes the steps that a grid topology is generated according to read system state information, and tidal data of a current system state are acquired; according to the tidal data of the current system state, the adaptive value of each system state in a generated system state set is calculated; according to the system state set, an initial population is generated; according to the size of the adaptive value of each individual in the initial population, a new population is generated optionally; the new population serves as a parent population and generates new child populations according to hybridization and mutation of the genetic algorithm; the generated child populations are continuously updated to meet preset cut-off conditions, and then a cascading failure result of a grid is output. By simulating the biological evolution process based on natural selection, online cascading failure evaluation is conducted on the grid, probable cascading failure paths in the current state of the system are quickly found, a failure early warning is given out, and aid decision making is provided for scheduling personnel.

Description

technical field [0001] The invention relates to the field of risk analysis of power system cascading failures, and more specifically, relates to an online simulation method and device for cascading failures of power grid systems based on genetic algorithms in power systems. Background technique [0002] With the continuous expansion of the interconnection scale of the power grid, the allocation of power resources has been further optimized, but the reliable operation of the power grid has ushered in new challenges. Following the two major power outages in the western United States in 1996, many large-scale power outages occurred around the world. [0003] The mechanism of cascading faults in the power system is as follows: when the power grid is in normal operation, each component has a certain initial load. When one or several components fail due to overload, it will change the balance of the power flow and cause the load Redistribution on other nodes, transferring excess ...

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Problems solved by technology

In previous studies on cascading failures in power systems, complexity theory mainly analyzes the power-law relationship between the scale of cascading failures and the probability of occurrence from a macro perspective, and analyzes the weak links of the system and the risk of cascading failures of the power grid through statistical data; Starting from the microscopic mechanism of faults, analyzing the occurrence of cascading faults, the developing power flow transfer, the action of safety automatic devices, and relay protection devices, the purpose is to study the specific evolution process of cascading faults, but as the system scale increases, the amount of calculation will increase exponentially , greatly increasing the time-consuming

At the same time, these methods focus on analyzing the static characteristics of the power grid from the perspective of power grid planning, and evaluating the cascading faults of the power grid. Therefore, they cannot be effectively applied to the operation guidance of the power grid

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