Power grid vulnerable line identification method containing wind-solar power supply

Abstract

The invention relates to a power grid vulnerable line identification method containing a wind-solar power supply. The method comprises the following steps of step1, calculating an overloading risk factor of a line under wind-solar power supply output fluctuation; step2, calculating an impacted and vulnerable index of a line k under an accident state in which a power grid randomly breaks one line;step3, establishing a consequent vulnerable index set including electrical structure importance, a breaking vulnerability index, and a node voltage offset index; and step4, based on a fuzzy hierarchical analysis (FAHP) and improved entropy weight method, acquiring a disconnection consequence vulnerability index of the line k. In the method, an actual operating condition of the power grid can be truly reflected under consideration of an impact of wind-solar power supply output random fluctuation; the vulnerable line is identified in a multidirectional mode through integrating the vulnerabilityindex; and an evaluation method based on the fuzzy hierarchical analysis and improved entropy weight method is proposed to solve a boundary problem of an information entropy, an optimal mathematical model considering a conditional constraint is used to scientifically integrate expert experience and objective data information so as to rationality evaluate line vulnerability.

Description

technical field [0001] The method relates to the field of power system safety and stability analysis, and specifically relates to a method for identifying vulnerable lines of a power grid containing wind and solar power. Background technique [0002] The current methods of identifying vulnerable lines in the power grid mainly focus on the study of system structural vulnerability based on complex network theory, and at the same time, the degree of deviation of various operating states after system failure is included in the vulnerability analysis, only considering the impact of the line failure on other parts of the system , without taking into account the impact of other line faults on the target line, the vulnerable line identification model is not perfect; as the installed capacity of wind and solar power sources in the power grid accounts for an increasing proportion, the output of wind and solar power sources will The negative impact of power fluctuations on the stable o...

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Problems solved by technology

[0002] The current methods of identifying vulnerable lines in the power grid mainly focus on the study of system structural vulnerability based on complex network theory, and at the same time, the degree of deviation of various operating states after system failure is included in the vulnerability analysis, only considering the impact of the line failure on other parts of the system , without taking into account the impact of other line faults on the target line, the vulnerable line identification model is not perfect; as the installed capacity of wind and solar power sources in the power grid accounts for an increasing proportion, the output of wind and solar power sources will The negative impact of power fluctuations on the stable operation of the power grid has gradually become prominent. At present, most literatures have conducted in-depth research on the vulnerability of traditional power grids, and there are relatively few studies on the impact of wind and solar power output fluctuations on the vulnerability of power grids.

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