Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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New PWM predictive control suitable for low carrier ratio of permanent magnet synchronous motor drive systems

  • Lu, Jinnan (School of Mechanical Engineering, Liaoning Technical University) ;
  • Liu, Zhixiang (School of Mechanical Engineering, Liaoning Technical University) ;
  • Zeng, Wei (State Grid Zhejiang Tongxiang Power Supply Company) ;
  • Ren, Ze (School of Mechanical Engineering, Liaoning Technical University)
  • Received : 2020.10.24
  • Accepted : 2021.01.27
  • Published : 2021.06.20
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Abstract

The drive inverters for high-power motors often need to reduce the carrier ratio (usually by reducing the lower switching frequency) to increase its capacity. However, the low carrier ratio results in motor control performance degradation. In this paper, an inverter and a permanent magnet synchronous motor (PMSM) are integrated to establish a unified prediction model with the delay caused by sampling and modulation that cannot be ignored under a low carrier ratio. Based on this model, a new PWM predictive control suitable for low carrier ratio (PPC-LCR) is proposed, which has better stability, dynamic performance, model accuracy and robustness under a low carrier ratio. To further enhance the control accuracy of the proposed strategy, prediction errors by parameter mismatch are analyzed, and a correction method of feedbacking the last beat prediction error is proposed to compensate for model error and parameter mismatch. Finally, experimental results are presented to support theoretical analysis and the proposed strategy.

Keywords

Acknowledgement

This research was funded by Project of National Natural Science Foundation of China (51874158), Project of National Natural Science Foundation of China (51904142), and Key project of Liaoning Provincial Department of Education (LJ2019ZL003)

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