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Cascading failure accident chain identification method for wind power-containing AC/DC hybrid power grid

A technology of AC/DC hybrid and cascading faults, which is applied in the direction of instruments, data processing applications, predictions, etc., can solve the problems of not being able to fully grasp and analyze the characteristics of cascading faults, and achieve the effect of effective guidance

Pending Publication Date: 2022-04-15
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying cascading fault fault chains of AC / DC hybrid power grids containing wind power, which solves the problem that the existing methods cannot fully grasp and analyze the characteristics of cascading faults

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  • Cascading failure accident chain identification method for wind power-containing AC/DC hybrid power grid
  • Cascading failure accident chain identification method for wind power-containing AC/DC hybrid power grid
  • Cascading failure accident chain identification method for wind power-containing AC/DC hybrid power grid

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Embodiment Construction

[0070] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] The present invention provides a method for identifying cascading fault fault chains of AC / DC hybrid power grids containing wind power. In the process of identifying cascading fault lines of AC / DC hybrid power grids containing new energy, the key fault line identification part of the next level includes: first , considering the influence of wind power output on the stability of the system and the characteristics of DC transmission on the AC-DC system, and then constructing wind power access from the perspectives of wind power output level, AC-DC interaction state, power flow operation, and network global topology Proportional short-circuit ratio index, multi-infeed short-circuit ratio index, weighted power flow entropy index, and line transmission betweenness index; by using the correlation coefficient and the subjective and objective w...

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Abstract

According to the cascading failure accident chain identification method for the wind power-containing AC / DC hybrid power grid disclosed by the invention, basic indexes for measuring the importance degree of a line from four aspects, namely the wind power output level, the stable state of AC / DC mutual influence, the power flow operation condition and the network global topological structure, are comprehensively considered; calculating a wind power access proportion short-circuit ratio index, a multi-infeed short-circuit ratio index, a weighted power flow entropy index and a line transmission betweenness index by using a correlation coefficient and an entropy weight method to obtain subjective and objective weights as basic weights, and linearly combining the two basic weights to obtain a comprehensive weight; solving by applying a grey wolf algorithm to obtain a combination coefficient, obtaining a comprehensive weight of each index, sorting according to comprehensive index values, and identifying the key power transmission line as a next-level accident chain of the cascading failure; and determining a cascading accident chain according to the criterion of ending the cascading failure prediction. The method is helpful for predicting the chain accident chain, and has an effective guiding effect on engineering practice.

Description

technical field [0001] The invention belongs to the technical field of safe operation of electric power systems, and in particular relates to an identification method for cascading fault fault chains of AC / DC hybrid power grids containing wind power. Background technique [0002] The geographical distribution of energy resources and regional economic development in China presents an unbalanced characteristic. With the proposal of the "double carbon" goal and the large-scale access of new energy, in order to promote the rational and efficient use of energy resources, my country's power grid has gradually developed into a long-distance , Large-capacity, large-scale AC-DC hybrid grid with new energy. If there is a small disturbance in the hybrid power grid, the fault will spread and cause cascading faults, which will develop into major blackouts and other accidents. Therefore, the research on the cascading failure sequence prediction method of the AC-DC hybrid power grid with n...

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Application Information

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IPC IPC(8): G06Q10/06G06Q10/04G06Q10/00G06Q50/06
CPCG06Q10/06393G06Q10/20G06Q10/04G06Q50/06
Inventor 朱大锐王海峰段建东白菁
Owner XIAN UNIV OF TECH