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http://dx.doi.org/10.6113/TKPE.2019.24.4.273

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)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.24, no.4, 2019 , pp. 273-278 More about this Journal
Abstract
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.
Keywords
AC motor; Inverter; Output torque enhancement; Overmodulation performance improvement; Voltage gain compensation;
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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.   DOI
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.   DOI
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.   DOI
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.   DOI
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.   DOI
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.   DOI
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.   DOI