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Optimization of Sensorless Control Performance for a Low-Switching Frequency Permanent Magnet Synchronous Motor Drive System

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Abstract

In a permanent magnet synchronous motor (PMSM) drive system without voltage sensor, affected by the inverter non-linearities, there is a phase offset problem between the reconstructed voltage and the actual voltage. This phase offset increases as the switching frequency decreases, especially pronounced in subway permanent magnet traction systems operating at the hundreds of Hertz level. As a result, in the medium-to high-speed range, the estimated rotor position progressively advances ahead of the actual rotor position, accompanied by an increasing content of estimated speed harmonics. To address this issue, this paper proposes a sensorless control performance optimization strategy for low switching frequency permanent magnet drive systems. On the one hand, the position error compensation strategy of voltage phase advance adjustment is adopted to eliminate the phase offset between the actual voltage and the reconstructed voltage. On the other hand, the method of cascading the adaptive notch filter with the low-pass filter is used to eliminate the harmonic interference in the feedback current, so as to realize the harmonic suppression of the estimated speed. The experimental results have confirmed the effectiveness of the proposed optimization strategy, ultimately the position sensorless control of the PMSM drive system with the inverter switching frequency of 500 Hz was achieved, effectively optimizing the control performance at low switching frequencies.

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Acknowledgements

This research was supported by the National Science Foundation of China Grant(Nos. 52177202 and 5230071484).

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Authors and Affiliations

  1. School of Electrical Engineering, Southeast University, Nanjing, China

    Yalu Mu

  2. National Key Laboratory of Science and Technology on Electromagnetic Energy, Naval University of Engineering, Wuhan, China

    Jilong Liu, Zhiqin Mai & Fei Xiao

  3. School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China

    Shun Li

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  1. Yalu Mu
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  2. Jilong Liu
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Correspondence to Zhiqin Mai.

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Mu, Y., Liu, J., Mai, Z. et al. Optimization of Sensorless Control Performance for a Low-Switching Frequency Permanent Magnet Synchronous Motor Drive System. J. Electr. Eng. Technol. 19, 2323–2336 (2024). https://doi.org/10.1007/s42835-023-01707-5

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  • DOI: https://doi.org/10.1007/s42835-023-01707-5

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