An Analytical Method for Three-phase Short-Circuit Current of Doubly-fed Fans Considering RSC Control

Abstract

The invention relates to a RSC control -considered analytic method of double-fed wind generator three-phase short-circuit current, belonging to the technical field of wind power generation system fault analysis. The method comprises the following steps: listing a DFIG stator and rotor voltage equation, a stator and rotor flux-linkage equation and a rotor voltage equation of RSC control; determining an analytic expression of stator flux linkage after fault happens; getting a rotor current second order differential equation; further solving the rotor current second order differential equation, and obtaining a RSC control -considered DFIG rotor short-circuit current analytic expression; further obtaining a stator current equation, substituting the stator flux linkage analytic expression and the rotor current analytic expression into the stator current equation, namely obtaining the RSC control -considered DFIG stator short-circuit current analytic expression. The method provided by the invention can accurately calculate the analytic expression of the rotor side converter-considered double-fed induced wind generator three-phase short-circuit current, and has very important significancein model selection and protection action feature analysis of power system equipment containing the double-fed induced wind generator.

Description

technical field [0001] The invention relates to a method for analyzing the three-phase short-circuit current of a doubly-fed fan considering RSC control, and belongs to the technical field of fault analysis of wind power generation systems. Background technique [0002] With the development of the global economy and the substantial increase in energy consumption, the contradiction between energy storage, production and use has become increasingly prominent, and it has become one of the important problems to be solved urgently by countries all over the world. Therefore, in order to solve problems such as energy crisis and environmental pollution, the research and development of new energy sources such as wind energy and solar energy has become a very urgent demand for human beings. Among them, wind energy is a clean and sustainable energy. Compared with traditional energy sources, wind power has the characteristics of not relying on external energy sources, no fuel price risk...

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Problems solved by technology

But on the other hand, the transient characteristics of grid-connected doubly-fed induction wind turbines are quite complicated when the grid-connected voltage suddenly drops, which is different from traditional synchronous and asynchronous motors.

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