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Optimal generation control strategy for DFIG considering grid frequency fluctuation sensitivity
Received:July 26, 2019  Revised:November 19, 2019
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Keywords:WECS  wind power production  power fluctuation  small signal analysis  multi-objective optimal
Fund Project:National Key Research and Development Program of China (2018YFB0904005)
        
AuthorInstitutionEmail
Tian Xin tianxin@sjtu.edu.cn
Cai Xu School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University xucai@sjtu.edu.cn
Jia Feng School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University typhoon0723@sjtu.edu.cn
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Abstract:
      In order to simultaneously improve power production and limit power fluctuation of wind energy conversion system (WECS), an improved torque control strategy with filter is proposed. Based on wind turbine aerodynamics, rotor kinematics and generator control principle, considering the natural wind spectrum characteristics and sensitive frequency band of grid, small signal analysis models from wind speed to rotational speed and output power is derived and established. Based on the transfer functions derived from the models, the speed tracking performance and power fluctuation of the optimal torque control and the modified torque control are compared. The analysis results show that the proposed control strategy improves the dynamic tracking performance of WECS for mid-low frequency wind, and avoids the severe power fluctuation for high frequency wind, achieving comprehensive optimization of improve power production and limit power fluctuation. Finally, a 1.5MW DFIG system was established on the BLADED and RTDS co-simulation platform.
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