Dynamic electric brake for a variable speed wind turbine having an exciter machine and a power converter not connected to the grid

Abstract

A variable speed wind turbine having a doubly fed induction generator (DFIG), includes an exciter machine mechanically coupled to the DFIG and a power converter placed between a rotor of the DFIG and the exciter machine. Thus, the power converter is not directly connected to the grid avoiding the introduction of undesired harmonic distortion and achieving a better power quality fed into the utility grid. Moreover, the variable speed wind turbine includes a power control and a pitch regulation.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Application No. 11 / 477,593, filed June 30, 2006, and U.S. Provisional Application No. 60 / 783,29, filed March 17, 2006, the disclosures of which are hereby incorporated by reference in their entirety . technical field [0003] The present invention relates to the field of variable speed wind turbines, and in particular to variable speed wind turbines comprising a doubly fed induction generator (DFIG), an exciter, an intermediate static converter not connected to the grid, power control and pitch regulation. Background technique [0004] In recent years, wind turbines have grown considerably worldwide. This growth is generally expected to continue for decades to come, even though the industry and technology has risen to a level of maturity in this field. As the total base of installed wind capacity continues to increase as wind farms grow in size, the importance of improving pow...

AI Technical Summary

Problems solved by technology

This mode of operation generates enormous mechanical forces in wind turbine components, which can cause premature failure

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