Doubly-fed wind turbine system and low voltage ride through method based on fault current limiting control

Abstract

The present invention relates to a doubly-fed wind generator system based on fault current-limiting control and a low voltage ride through method which aim to solve the problems that the current change amplitude is large, a low voltage ride through effect is poor, and the normal operation of the system after voltage recovery is not conducive when the conventional doubly-fed wind generator system carries out the low voltage ride through. The doubly-fed wind generator system based on the fault current-limiting control comprises a doubly-fed wind generator fault current limiter, the fault current limiter is arranged between an equivalent power grid and a doubly-fed wind generator stator and comprises a rectifier bridge circuit and a sectionalized switching circuit, and the rectifier bridge circuit comprises a first bridge arm, a second bridge arm and a third bridge arm. The equivalent power grid is connected with the midpoint of the first bridge arm, the midpoint of the third bridge arm is connected with a doubly-fed wind generator, and the sectionalized switching circuit is connected between the midpoint of the first bridge arm and the midpoint of the third bridge arm. According to the present invention, the fault current limiter possesses a better low voltage ride through performance.

Description

technical field [0001] The invention relates to a doubly-fed wind power generator system and a low-voltage ride-through method thereof, in particular to a doubly-fed wind power generator system based on fault current limiting control and a low-voltage ride-through method thereof, and belongs to the technical field of doubly-fed wind power generators. Background technique [0002] In recent years, as the country pays more and more attention to new energy power generation technology, wind power generation has become a very popular emerging industry. There are many types of wind turbines to choose from. So far, the doubly-fed asynchronous type and the permanent magnet direct drive type have been gradually selected as the mainstream types during the development of wind power. One of the key issues of doubly-fed asynchronous wind generators at present is low voltage ride through technology. At present, the crowbar circuit is mainly used to suppress the low voltage ride through i...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the existing doubly-fed wind power generator system undergoes low-voltage ride-through, the current variation range is large, the effect of low-voltage ride-through is poor, and it is not conducive to the normal operation of the system after the voltage recovery

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