Journal of Power Electronics

  • 제22권5호
  • /
  • Pages.773-783
  • /
  • 2022
  • /
  • 1598-2092(pISSN)
  • /
  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

A vector-splitting method for neutral-point voltage regulation in a three-level inverter

  • Hwang, Hankyu (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology) ;
  • Lee, Woosuk (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology) ;
  • Park, Yongsoon (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology)
  • 투고 : 2021.10.27
  • 심사 : 2022.01.25
  • 발행 : 2022.05.20
⟨ 이전 논문 다음 논문 ⟩

초록

Neutral-point voltage regulation is one of the critical issues of a three-level inverter. This problem adversely affects the reliability of the power semiconductor. Zero-sequence voltage (ZSV) can be useful to regulate the neutral-point voltage in a three-level inverter. However, the regulating performance can be impeded by the change of the modulation index and the power factor. In this paper, a novel method is proposed to improve ZSV-based regulation. By aptly splitting a reference vector, the available range of the neutral-point current can be further stabilized at each operating point. It is detailed how to combine vector splitting with ZSV-based regulation. After the proposed method is discussed with simulation results for the entire first quadrant operation of an induction motor, its effectiveness is validated with experimental results under harsh operating conditions. As a result, the proposed method could effectively regulate the neutral-point voltage at various operating points and, in particular, could reduce neutral-point voltage ripples by 72.6% even under the worst condition.

키워드

과제정보

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20203030020200), and (No. 20204010600340).

참고문헌

  1. Portillo, R.C., et al.: Modeling strategy for back-to-back three-level converters applied to high-power wind turbines. IEEE Trans. Ind. Electron. 53(5), 1483-1491 (2006) https://doi.org/10.1109/TIE.2006.882025
  2. Yamanaka, K., Hava, A.M., Kirino, H., Tanaka, Y., Koga, N., Kume, T.: A novel neutral point potential stabilization technique using the information of output current polarities and voltage vector. IEEE Trans. Ind. Appl. 38(6), 1572-1580 (2002) https://doi.org/10.1109/TIA.2002.804761
  3. Weidong, J., Wang, L., Wang, J., Zhang, X., Wang, P.: A carrier-based virtual space vector modulation with active neutral-point voltage control for a neutral-point-clamped three-level inverter. IEEE Trans. Ind. Electron. 65(11), 8687-8696 (2018) https://doi.org/10.1109/TIE.2018.2808926
  4. Choi, U., Lee, J., Lee, K.: New modulation strategy to balance the neutral-point voltage for three-level neutral-clamped inverter systems. IEEE Trans. Energy Convers. 29(1), 91-100 (2014) https://doi.org/10.1109/TEC.2013.2293502
  5. Lewicki, A., Krzeminski, Z., Abu-Rub, H.: Space-vector pulsewidth modulation for three-level NPC converter with the neutral point voltage control. IEEE Trans. Ind. Electron. 58(11), 5076-5086 (2011) https://doi.org/10.1109/TIE.2011.2119453
  6. Celanovic, N., Boroyevich, D.: A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters. IEEE Trans. Power Electron. 15(2), 242-249 (2000) https://doi.org/10.1109/63.838096
  7. C. Newton and M. Sumner: Neutral point control for multi-level inverters: Theory, design, and operational limitations. In: Proceedings of IEEE Industry Applications Society Annual Meeting, vol. 2, New Orleans, LA, Oct. 5-9, 1997, pp. 1336-1343
  8. Akagi, H., Hatada, T.: Voltage balancing control for a three-level diode-clamped converter in a medium-voltage transformerless hybrid active flter. IEEE Trans. Power Electron. 24(3), 571-579 (2009) https://doi.org/10.1109/TPEL.2009.2012528
  9. Wang, C., Li, Y.: Analysis and calculation of zero-sequence voltage considering neutral-point potential balancing in three-level NPC converters. IEEE Trans. Ind. Electron. 57(7), 2262-2271 (2010) https://doi.org/10.1109/TIE.2009.2024093
  10. J. Kolar, T. Wolbank, and M. Schrodl: Analytical calculation of the RMS current stress on the DC link capacitor of voltage DC link PWM converter systems. In Proceedings of the 9th International Conference of Electric Machines and Drives, Sep. 1-3, 1999, pp. 81-89.
  11. J. Shen, S. Schruder, B. Duro, R. Roesner: A neutral point balancing controller for three-level inverter with full power-factor range and low distortion. In: 2011 IEEE Energy Conversion Congress and Exposition, 2011, pp. 3419-3426
  12. L. Lin, Y. Zou, Z. Wang, and H. Jin: Modeling and control of neutral point voltage balancing problem in three-level NPC PWM inverters. In: Proceedings of 36th IEEE PESC, Recife, Brazil, Jun. 2005, pp. 861-866
  13. 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) https://doi.org/10.1109/LPEL.2004.828445
  14. Wang, J., Gao, Y., Jiang, W.: A carrier-based implementation of virtual space vector modulation for neutral-point-clamped three-level inverter. IEEE Trans. Ind. Electron. 64(12), 9580-9586 (2017) https://doi.org/10.1109/TIE.2017.2711550
  15. Q. Song, W. Liu, Q.Yu, X. Xie and Z. Wang: A neutral-point potential balancing algorithm for three-level NPC inverters using analytically injected zero-sequence voltage. In: Proceedings of IEEE APEC, Feb. 2003, vol. 1, pp. 228-233
  16. Park, Y., Sul, S., Lim, C., Kim, W., Lee, S.: Asymmetric control of DC-Link voltages for separate MPPTs in three-level inverters. IEEE Trans. Power Electron. 28(6), 2760-2769 (2013) https://doi.org/10.1109/TPEL.2012.2224139
  17. Maheshwari, R., Munk-Nielsen, S., Busquets-Monge, S.: Design of neutral-point voltage controller of a three-level NPC inverter with small DC-Link capacitors. IEEE Trans. Ind. Electron. 60(5), 1861-1871 (2013) https://doi.org/10.1109/TIE.2012.2202352
  18. H. -J. Lee, T. -g. Woo, S. Kim and Y. -d. Yoon: Improved Neutral Point Voltage Balancing Control with Time Delay Compensation and Anti-Windup Loop for a 3-Level NPC Inverter. IEEE Trans. Ind. Appl.
  19. Wu, Y., Chang, S., Mandal, P.: Grid-connected wind power plants: a survey on the integration requirements in modern grid codes. IEEE Trans. Ind. Appl. 55(6), 5584-5593 (2019) https://doi.org/10.1109/tia.2019.2934081
  20. Rangarajan, S.S., Collins, E.R., Fox, J.C., Kothari, D.P.: A survey on global PV interconnection standards. IEEE Power and Energy Conference at Illinois (PECI) 2017, 1-8 (2017)