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A Robust Current Control Scheme for Five-Phase Permanent Magnet Synchronous Motor Based on Enhanced Disturbance Observer |
Xiong Cong1,2, Xu Haiping2, Guan Tao2, Zhou Peng2 |
1. University of Chinese Academy of Sciences Beijing 100049 China; 2. Key Laboratory of Power Electronics and Electric DriveInstitute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China |
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Abstract The dual synchronous rotating frame proportional integral (PI) control is most frequently employed in five-phase permanent magnet synchronous motor drives. However, its control performance is easily affected by disturbances such as parameter perturbation and inverter nonlinearity. Due to the limited bandwidth of the PI controller, there is usually a low-order harmonic current caused by the dead time of the inverter in the stator current. Therefore, this paper proposes a proportional integral control method based on the enhanced disturbance observer (EDOB-PI). The disturbances existing in the five-phase permanent magnet synchronous motor are classified and modeled. Then a disturbance observer is designed to observe the disturbance. Finally, the disturbance is compensated by the feed-forward channel. This method can improve parameter perturbation robustness and suppress low-order harmonic current caused by dead time and harmonic rotor permanent magnet flux. The experimental results have verified the proposed method.
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Received: 20 November 2018
Published: 27 March 2020
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