New PWM predictive control suitable for low carrier ratio of permanent magnet synchronous motor drive systems

Jinnan Lu; Zhixiang Liu; Wei Zeng; Ze Ren

New PWM predictive control suitable for low carrier ratio of permanent magnet synchronous motor drive systems

Vol. 21, No. 6, pp. 881-891, Jun. 2021

10.1007/s43236-021-00223-x

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.

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Cite this article

[IEEE Style]

J. Lu, Z. Liu, W. Zeng and Z. Ren, "New PWM predictive control suitable for low carrier ratio of permanent magnet synchronous motor drive systems," Journal of Power Electronics, vol. 21, no. 6, pp. 881-891, 2021. DOI: 10.1007/s43236-021-00223-x.

[ACM Style]

Jinnan Lu, Zhixiang Liu, Wei Zeng, and Ze Ren. 2021. New PWM predictive control suitable for low carrier ratio of permanent magnet synchronous motor drive systems. Journal of Power Electronics, 21, 6, (2021), 881-891. DOI: 10.1007/s43236-021-00223-x.