전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제24권4호
  • /
  • Pages.273-278
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  • 2019
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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교류 전동기의 출력 토크 향상을 위한 인버터의 과변조 성능 개선 방법

Method for Improving Overmodulation Performance of an Inverter for the Enhanced Output Torque of AC Motors

  • Jeong, Hye-In (Dept. of Electrical and Medical Convergent Engineering, Kangwon National University) ;
  • Kim, Sang-Hoon (Dept. of Electrical and Electronic Engineering, Kangwon National University)
  • 투고 : 2019.02.06
  • 심사 : 2019.03.18
  • 발행 : 2019.08.20
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초록

This study proposes a method for improving the overmodulation performance of a three-phase inverter to obtain an enhanced output torque for the AC motors. In the inverter-fed AC motor drives, the output torque of the motor can be enhanced by utilizing the overmodulation region as well as the linear modulation regions of the inverter. The overmodulation method is used for this overmodulation operation of the inverter. However, the voltage gain, the ratio of the output voltage of the inverter to the reference voltage achieved by the conventional overmodulation methods becomes nonlinearly smaller than unity. Therefore, the effect of improving the output torque of the AC motors is insignificant even when the overmodulation region is utilized. In this study, we propose a method that improves the overmodulation performance of the inverter by compensating the limited amount of the reference voltage in the overmodulation operation to enhance the output torque of the AC motors. The effectiveness of the proposed method is verified through the simulations and experiments with an 800 W permanent magnet synchronous motor.

키워드

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Fig. 1. Reference voltage vectors limited by the conventional overmodulation methods.

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Fig. 2. Voltage modulation performance of the inverter for the conventional overmodulation methods.

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Fig. 3. Block diagram of the proposed method.

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Fig. 4. Reference voltage vector compensated by the proposed method.

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Fig. 5. Reference voltage vector limited by the overmodulation technique without and with the proposed method.

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Fig. 6. Voltage modulation performance of the inverter improved by the proposed method.

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Fig. 7. Simulation results for the conventional method and the proposed method.

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Fig. 8. Simulation results for the acceleration performances.

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Fig. 10. Experiment results for the acceleration performances.

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Fig. 9. Experiment results for the conventional method and the proposed method.

TABLE I PARAMETERS OF THE PMSM DRIVE SYSTEM

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참고문헌

  1. T. S. Kwon and S. K. Sul, “Novel antiwindup of a current regulator of a surface-mounted permanentmagnet motor for flux-weakening control,” IEEE Trans. Ind. Appl., Vol. 42, No. 5, pp. 1293-1300, Sep./Oct. 2006. https://doi.org/10.1109/TIA.2006.880836
  2. T. S. Kwon, G. Y. Choi, M. S. Kwak, and S. K. Sul, “Novel flux-weakening control of an IPMSM for quasi-six-step operation,” IEEE Trans. Ind. Appl., Vol. 44, No. 6, pp. 1722-1731, Nov./Dec. 2006. https://doi.org/10.1109/TIA.2008.2006305
  3. Y. C. Kwon, S. M. Kim, and S. K. Sul, “Six-step operation of PMSM with instantaneous current control,” IEEE Trans. Ind. Appl., Vol. 50, No. 4, pp. 2614-2625, Jul./Aug. 2014. https://doi.org/10.1109/TIA.2013.2296652
  4. S. H. Kim, Electric Motor Control, DC, AC, and BLDC Motors, Elsevier Inc., Ch. 7, 2017.
  5. L. Rossetto, P. Tenti, and A. Zuccato "Integrated optimum control of quasi-direct converters," IEEE Trans. Power Electron, Vol. 12, No. 6, pp. 993-999, Nov. 1997.
  6. S. M. Hong, H. K. Lee, K. H. Nam, and J. H. Kim, "Analytic overmodulation method and application to IPMSM current control," in Proc. IEEE ECCE, pp. 5817-5823, Sep. 2018.
  7. Y. S. Park, S. K. Sul, and K. N. Hong, “Linear overmodulation strategy for current control in photovoltaic inverter,” IEEE Trans. Ind. Appl., Vol. 52, No. 1, pp. 322-331, Jan./Feb. 2016. https://doi.org/10.1109/TIA.2015.2472518
  8. J. K. Seok, J. S. Kim, and S. K. Sul, “Overmodulation strategy for high-performance torque control,” IEEE Trans. Power Electron., Vol. 13, No. 4, pp. 786-792, Jul. 1998. https://doi.org/10.1109/63.704159
  9. B. H. Bae and S. K. Sul, “A novel dynamic overmodulation strategy for fast torque control of high-saliency-ratio AC motor,” IEEE Trans. Ind. Appl., Vol. 41, No. 4, pp. 1013-1019, Jul./Aug. 2005. https://doi.org/10.1109/TIA.2005.851042
  10. S. Morimoto, M. Sanada, and Y. Takeda, “Wide-speed operation of interior permanent magnet synchronous motors with high-performance current regulator,” IEEE Trans. Ind. Appl., Vol. 30, No. 4, pp. 920-926, Jul./Aug. 1994. https://doi.org/10.1109/28.297908