Journal of Power Electronics

  • 제24권7호
  • /
  • Pages.1024-1034
  • /
  • 2024
  • /
  • 1598-2092(pISSN)
  • /
  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

Hybrid varied virtual vector modulation method of parallel three-level inverter considering neutral point potential and phase current balance

  • Ying Zhong (National Key Laboratory of Electromagnetic Energy, Naval University of Engineering) ;
  • Weichao Li (National Key Laboratory of Electromagnetic Energy, Naval University of Engineering) ;
  • Liang Zhou (National Key Laboratory of Electromagnetic Energy, Naval University of Engineering) ;
  • Chen Deng (National Key Laboratory of Electromagnetic Energy, Naval University of Engineering) ;
  • Ming Yan (National Key Laboratory of Electromagnetic Energy, Naval University of Engineering)
  • Received : 2023.12.10
  • Accepted : 2024.04.12
  • Published : 2024.07.20
⟨ 이전 논문 다음 논문 ⟩

Abstract

The shift and low-frequency oscillations of neutral point potential are key issues in the neutral point clamped (NPC) inverter. The space vector pulse width modulation (SVPWM) algorithm has limited voltage balancing ability at high modulation levels and low power factors. The virtual SVPWM can achieve midpoint potential balance across the entire range, but it has the problem of multiple switching times and poor harmonic characteristics. Parallel three-level NPC inverters can increase the power rating and efficiency of systems, thus being suitable for high-power applications. However, their parallel topology also brings current sharing issues. This paper first proposes several methods of combining varied virtual middle vectors based on five-level vectors, which control the midpoint current by adjusting the action time of the basic vector. Second, different virtual vector combinations are used for voltage commands with different modulation indexes to reduce the switching frequency of the inverter and the synthesis vector error. The proposed hybrid method has fewer switching times, reduces the amplitude of midpoint voltage fluctuation, and has good harmonic characteristics of output current. Finally, the feasibility and effectiveness of the hybrid method are verified through simulation and experiments.

Keywords

Acknowledgement

This article is funded by the National Defense Science and Technology Outstanding Youth Foundation, 2022-JCJQ-ZQ-002, Weichao Li.

References

  1. Marzoughi, A., Burgos, R., Boroyevich, D., Xue, Y.: Design and comparison of cascaded H-bridge, modular multilevel converter and 5L active neutral point clamped topologies for motor drive applications. IEEE Trans. Ind. Appl. 54(2), 1404-1413 (2018)
  2. Song, W., Feng, X., Smedley, K.M.: A carrier-based PWM strategy with the offset voltage injection for single-phase three-level neutral-point-clamped converters. IEEE Trans. Power Electron. 28(3), 1083-1095 (2013)
  3. Li, W., Ma, W., Wang, G.: A novel SVPWM method for single-phase cascaded NPC H-bridge inverter. Proc. CSEE. 34(30), 5313-5319 (2014)
  4. Pou, J., Zaragoza, J., Ceballos, S., Saeedifard, M., Boroyevich, D.: A carrier-based PWM strategy with zero-sequence voltage injection for a three-level neutral-point-clamped converter. IEEE Trans. Power Electron. 27(2), 642-651 (2012)
  5. Chen, W., Sun, H., Gu, X., Xia, C.: Synchronized space-vector PWM for three-level VSI with lower harmonic distortion and switching frequency. IEEE Trans. Power Electron. 31(9), 6428-6441 (2016)
  6. Orfanoudakis, G.I., Yuratich, M.A., Sharkh, S.M.: Nearest-vector modulation strategies with minimum amplitude of low-frequency neutral-point voltage oscillations for the neutral-point-clamped converter. IEEE Trans. Power Electron. 28(10), 4485-4499 (2013)
  7. Busquets-Monge, S., Bordonau, J., Boroyevich, D., Somavilla, S.: The nearest three virtual space vector PWM-a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter. IEEE Power Electron. Lett. 2(1), 11-15 (2004)
  8. Hu, C., Yu, X., Holmes, D.G.: An improved virtual space vector modulation scheme for three-level active neutral-point-clamped inverter. IEEE Trans. Power Electron. 32(10), 7419-7434 (2017)
  9. Busquets-Monge, S., Ortega, J.D., Bordonau, J., Beristain, J.A., Rocabert, J.: Closed-loop control of a three-phase neutral-point-clamped inverter using an optimized virtual-vector-based pulse width modulation. IEEE Trans. Ind. Electron. 55(5), 2061-2071 (2008)
  10. Gui, S., Wi, F., Wan, S.: A strategy for considering neutral-point potential balance for three-level NPC inverters with the varied virtual space vector. Proc. CSEE. 35(19), 5013-5021 (2015)
  11. Busquets-Monge, S., Bordonau, J., Rocabert, J.: A virtual-vector pulse width modulation for the four-level diode-clamped DC-AC converter. IEEE Trans. Power Electron. 23(4), 1964-1972 (2008)
  12. Wang, K., Zheng, Z., Li, Y.: Topology and control of a four-level ANPC inverter. IEEE Trans. Power Electron. 35(3), 2342-2352 (2019)
  13. Qamar, M.A., Wang, K., Zheng, Z., Wang, S.: A generalized simplified virtual vector PWM to balance the capacitor voltages of multilevel diode-clamped converters. IEEE Trans. Power Electron. 37(8), 9377-9391 (2022)
  14. Jiang, D., Shen, Z., Wang, F.: Common-mode voltage reduction for paralleled inverters. IEEE Trans. Power Electron. 33(5), 3961-3974 (2018)
  15. Li, W., Zhang, X., Zhuang, Y.: A novel zero-common-mode-voltage modulation method based on five-level vector space for parallel operated three-level inverters. Proc. CSEE. 40(19), 6308-6319 (2020)
  16. Li, W., Zhang, X., Zhang, F.: Integrated modulation of dual-parallel three-level inverters with reduced common mode voltage and circulating current. IEEE Trans. Power Electron. 36(11), 13322-13344 (2021)
  17. Zhong, Y., Li, W., Zhou, L.: Modulation method of parallel inter-leaved three-level inverter considering neutral point potential and phase current balance. J. Power Electron. 23(2), 241-251 (2023)
  18. Xia, C., Shao, H., Zhang, Y.: Adjustable proportional hybrid SVPWM strategy for neutral-point-clamped three-level inverters. IEEE Trans. Ind. Electron. 60(10), 4234-4241 (2013)
  19. Zhang, Y., Zhao, Z., Zhu, J.: A hybrid PWM applied to high-power three-level inverter-fed induction-motor drives. IEEE Trans. Ind. Electron. 58(8), 3409-3420 (2011)
  20. Jiang, W.D., Du, S.W., Chang, L.C.: Hybrid PWM strategy of SVPWM and VSVPWM for NPC three-level voltage-source inverter. IEEE Trans. Power Electron. 25(10), 2607-2619 (2010)