Efficiency Optimization of Permanent Magnet Synchronous Generators Based on Model Predictive Direct Torque Control
Miao Lei1, Zhang Yongjun1, Tong Chaonan2, Xiao Xiong1, Wang Wei3
1. Engineering Technology Research Institute University of Science and Technology Beijing Beijing 100083 China; 2. School of Automation University of Science and Technology Beijing Beijing 100083 China; 3. Mechanical Engineering Department Tsinghua University Beijing 100084 China
Abstract：A new model predictive direct torque control (MPDTC) scheme of efficiency optimization is proposed in this paper to suppress the torque ripple of wind generator and running efficiency of the wind energy conversion system based on a direct-drive permanent magnet synchronous generator (PMSG). The MPDTC is combined with the generator loss model of PMSG. A predictive value of stator active current which is used to obtain the predictive value of electromagnetic torque is proposed to replace the traditional predictive value of stator current. The stator active current setting value is obtained from the minimum loss point of the wind power generator system. Besides, the torque setting value is obtained from the maximum wind power extraction control adopting the optimal feedback torque method. A cost function for efficiency optimization is designed to select the optimum voltage vector, so as to keep the system running in the state of minimum loss. Simulation studies and experiment researches are carried out on a surface-mounted PMSG by doing speed step and torque step. The results confirm that the proposed method has inhibited the torque ripple, and improved dynamic response while improving the efficiency of the system.
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2018, Vol. 33 
