Variable frequency control power module of wind power generator

Abstract

The invention relates to a doubly-fed variable frequency control power module structure of a wind power generator. Aiming at the high failure rate caused by an electrical structure of the traditional variable frequency control power module of a wind power generator, a doubly-fed variable frequency control power module of a wind power generator is disclosed, which comprises a converter, a positive DC (Direct Current) busbar, a negative DC busbar, an interconnecting busbar and an AC (Alternating Current) busbar. The positive DC busbar and the negative DC busbar are used for transferring DC, the AC busbar is used for transferring AC, the interconnecting busbar is used for electrical connection of a filter circuit; the converter is connected with the positive DC busbar, the negative DC busbar and the AC busbar, and the positive DC busbar and the negative DC busbar respectively consist of two DC conducting plates which are piled up and isolated by insulating materials. The invention is mainly used for variable frequency control of a large-power wind power generator, and has the advantages of simple and reliable electrical connection, convenient installation and practicality.

Description

technical field [0001] The invention relates to a wind power generator frequency conversion control technology, in particular to a doubly-fed wind power generator frequency conversion control power module structure. Background technique [0002] With the rapid development of my country's wind power generation industry, the pure and pollution-free electric energy brought by wind power generation accounts for an increasing proportion of my country's total power generation. Doubly-fed asynchronous wind turbines are the mainstream equipment for high-power wind turbines, and their inverters include control systems, two back-to-back AC-DC-AC converters and filter circuits (collectively referred to as power modules). When the doubly-fed asynchronous wind turbine is in the sub-synchronous operation state, the first converter connected to the grid through the AC busbar receives the three-phase AC power of the grid through AC-DC conversion to the DC busbar (including the positive DC b...

AI Technical Summary

Problems solved by technology

Judging from the current faults of wind power inverters, burnouts due to unreasonable design of power modules often occur, especially for megawatt-class high-power wind turbines. Thousand amperes, and the power module works in a high frequency state, which is very sensitive to the distributed parameters of the electrical structure of the power module, especially the distributed inductance. Improper wiring in the electrical structure is often an important factor leading to failure or even burning of the power module

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