Online simulation method and device for cascading faults of power grid system based on genetic algorithm
A power grid system, cascading failure technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as inability to effectively apply power grid operation guidance, increase in time consumption, and increase in calculation amount.
Active Publication Date: 2016-12-14
TSINGHUA UNIV +1
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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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[0041]In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that these embodiments may be practiced without these specific details.
[0042] The current domestic and foreign research on power system cascading failures proposed above cannot be effectively applied to the operation guidance of the power grid. The present invention proposes an online simulation method and device for power grid system cascading faults based on a genetic algorithm. The cascading faults simulation using the genetic evolution algorithm aims to simulate the evolution process of the system for different initial states of the system through appropriate selection pressure settings, and search for possible faults in the system. Cascading failure states and uncover system weaknesses.
[0043] In the present invention, the operating conditions of the power system ...
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The invention provides a genetic algorithm-based online simulation method and device for power grid system cascading failures, wherein the method includes: generating power grid topology according to the read system state information, and obtaining power flow data of the current system state; Data, calculate the fitness value of each system state in the generated system state set; generate the initial population according to the system state set; select and generate a new population according to the fitness value of each individual in the initial population; the new population is used as the parent The generation population generates a new offspring population according to the hybridization and mutation of the genetic algorithm; the generated offspring population is continuously updated to reach the preset cut-off condition, and the cascading failure result of the power grid is output. By simulating the process of biological process based on natural selection, the invention evaluates the online cascading faults of the power grid, quickly discovers possible cascading fault paths in the current state of the system, issues fault warnings, and provides auxiliary decision-making for dispatchers.
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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IPC IPC(8): G06F19/00
Inventor 程林刘满君赵庆明张裕李庆生田浩江轶高滨农静
Owner TSINGHUA UNIV