Abstract

The wind power utilization efficiency can be changed by controlling the pitch angle when the wind speed is over rating and succeed in limiting the output power of variable speed constant frequency wind power system at rated power. This paper is focusing on the third-order model of wind power system which is linearized by the DFL theory. And this also obtains the controlling of backstepping sliding mode and backstepping sliding mode pitch angle controller. The presented controlling method can effectively achieve constant power control of variable speed wind power system under large-scale changing of wind speed over rating. This is proved by the simulation results.

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