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

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Overmodulation Characteristics of Carrier Based MVPWM for Eliminating the Leakage Currents in Three-Level Inverter

3-레벨 인버터의 누설전류 제거를 위한 캐리어 기반 MVPWM의 과변조 특성

  • Received : 2015.09.13
  • Accepted : 2015.10.12
  • Published : 2015.12.20
Download PDF
⟨ Previous Next ⟩

Abstract

The overmodulation characteristics of a carrier-based medium vector pulse width modulation (CBMVPWM) are examined in this study. CBMVPWM can completely eliminate leakage currents in a three-phase, three-level inverter using only the switching states with the same common mode voltage even in an overmodulation operation. The analytic equations for the magnitude of the output voltage and the switching frequency are derived for overmodulation operation, and the effect of dead time on the leakage current is demonstrated. This study presents the operating principle of CBMVPWM, basic overmodulation features, and simulations and experiments for operating verification.

Keywords

References

  1. A. Jain, A. Mahor, and P. Bajpai, "The state of art of reduction of leakage current in grid connected inverters for PV system," International Journal of Engineering and Advanced Technology, Vol. 3, Issue 3, pp. 333-336, Feb. 2014.
  2. J. S. Lee and K. B. Lee, "New modulation techniques for a leakage current reduction and a neutral-point voltage balance in transformerless photovoltaic systems using a three-level inverter," IEEE Trans. on Power Electronics, Vol. 29. No. 14, pp. 1720-1732, Apr. 2014. https://doi.org/10.1109/TPEL.2013.2264954
  3. M. C. Cavalcanti, A. M. Farias, K. C. Oliveira, F. A. S. Neves, and J. L. Afonso, “Eliminating leakage currents in neutral point clamped inverters for photovoltaic systems,” IEEE Trans. on Industrial Electronics, Vol. 59, No. 1, pp. 435-442, Jan. 2012. https://doi.org/10.1109/TIE.2011.2138671
  4. K. Zhou and D. Wang, “Relationship between space -vector modulation and three-phase carrier-based PWM: A comprehensive analysis,” IEEE Trans. on Industrial Electronics, Vol. 49, No. 1, pp. 186-196, Jan. 2002. https://doi.org/10.1109/41.982262
  5. X. Guo, M. C. Cavalcanti, A. M. Farias, and J. M. Guerrero, “Single-carrier modulation for neutral-point-clamped inverters in three-phase transformerless photovoltaic systems,” IEEE Trans. on Power Electronics, Vol. 28, No. 6, pp. 2635-2637, June 2013. https://doi.org/10.1109/TPEL.2012.2224138
  6. N. S. Choi, E. C. Lee, and K. S. Ahn, "A carrier-based meduim vector PWM strategy for three level inverters in transformerless photovoltaic systems," Conf. Record on ICPE 2015, Jun 1-6, Seoul, Korea