Power distribution network voltage stability probability evaluation method based on large-scale wind power and electric automobile grid connection

Abstract

The invention belongs to the technical field of power distribution network operation control, and particularly relates to a power distribution network voltage stability probability evaluation method based on large-scale wind power and electric automobile grid connection. The method comprises the following steps: (1), inputting relevant data such as actually measured data and the like of a wind power plant; (2), building a probability model of an electric automobile charge load and a probability model of a wind power plant output; (3) sampling the probability models of the electric automobile charging load and the wind power plant output in the step (2) by adopting a slice sampling algorithm, and constructing sample spaces of input random variables; (4) calculating corresponding values in the sample spaces of the input random variables at the moment t by adopting a continuous power flow algorithm to obtain output random variables of a system voltage stability margin at the moment; and (5) obtaining probability distribution characteristics of the output random variables according to a probability statistics method. The method has the effects that the accuracy and effectiveness of voltage stability probability evaluation are greatly improved from the perspective of the sampling algorithm.

Description

Technical field [0001] The invention belongs to the technical field of distribution network operation control, and specifically relates to a distribution network voltage stability probability assessment method that takes into account the grid connection of large-scale wind power and electric vehicles. Background technique [0002] As the contribution of new energy power generation to the world's energy supply and environmental protection has become increasingly obvious, how to make full use of new energy power generation including wind power and photovoltaics and focus on the implementation of energy saving and emission reduction projects have become a broad consensus in today's society. Wind power and electric vehicles, as the main direction of the development of the power industry and the automobile industry, will receive extensive support from the whole society and large-scale promotion and application. However, the integration of large-scale electric vehicles into the distrib...

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Problems solved by technology

[0005] However, the Monte Carlo simulation method has been gradually used as a standard for verifying the accuracy of other methods due to its high computational cost.

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