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Variable-speed fixed-pitch (VSFP) wind turbines have good prospects in small-to-medium-scale wind power markets due to their simple structure, low cost, and high reliability. One difficulty with VSFP concept wind turbines is to prevent overspeeding and overloading problems at excessive wind velocities, which has rarely been reported in literatures until now. This paper first proposes a sensorless...
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is...
This paper aims to discuss a novel variable speed direct drive wind energy conversion system (WECS) based on doubly salient electro-magnetic (DSEM) generator. The basic characteristic of the DSEM generator is firstly introduced. Then, for the relatively low speed of the rotor in large scale direct drive application, some special structures of the DSEM generator are presented. In order to optimize...
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