Electric Power ›› 2013, Vol. 46 ›› Issue (3): 19-23.DOI: 10.11930/j.issn.1004-9649.2013.3.19.4

• New Energy • Previous Articles     Next Articles

Optimum Pitch Control of Wind Turbines

HE Yu-lin, LUO Min, XIE Shuang-yi, ZHONG Xiang, JIN Xin   

  1. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China
  • Received:2012-11-20 Online:2013-03-05 Published:2015-12-10

Abstract: Dynamic responses of a wind turbine to sudden wind speed changes are usually hysteretic because of the wind’s stochastic characteristics and large moment of inertia in the rotor, which may cause large fluctuation of rotor speed and output power. Based on linear quadratic Gaussian(LQG) control theory, an optimum pitch control is proposed, which could inhibit the rotor speed and power fluctuations better than traditional PI control. With a wind turbine of 2 MW as a research object, a simulation analysis of LQG and PI controls is conducted by using FAST-MATLAB/Simulink joint software platform, which shows that the optimum pitch control based on LQG theory could effectively reduce the fluctuations of speed and power.

Key words: wind turbine generator, variable speed and variable pitch control, state estimation, linear quadratic Gaussian control theory

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