Journal of Power Electronics

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

DOI QR Code

Voltage equalization control of three-phase cascaded H-bridge multilevel rectifiers

  • Liqiao Wang (Department of Electrical Engineering, Yanshan University) ;
  • Xuchen Chen (Department of Electrical Engineering, Yanshan University) ;
  • Zukun Zhang (Department of Electrical Engineering, Yanshan University) ;
  • Xuemeng Guo (Department of Electrical Engineering, Yanshan University)
  • Received : 2021.12.12
  • Accepted : 2022.09.26
  • Published : 2023.02.20
⟨ Previous Next ⟩

Abstract

According to the structure and characteristics of a three-phase cascaded H-bridge (CHB) of a high-power multilevel converter, the problem of DC side voltage imbalance in practical applications and the disadvantage where the complexity of the traditional centralized control voltage equalization scheme increases rapidly with an increase of the number of modules both need to be solved. In addition, with the characteristic that distributed control is conducive to the expansion of the system to high-power and multi-module cascade, a new quasi-distributed equalization control strategy is proposed in this paper. The new equalization control strategy combines the traditional closed-loop control with the modulation ratio correction method. On the basis of the traditional closed-loop control, an equalization control module is added to realize a balanced output of the DC side voltage. The control of the equalization control module is simple and flexible, and the complexity of the overall control algorithm is independent of the number of modules. Finally, the correctness and reliability of the control method are verified by experiments.

Keywords

Acknowledgement

This work was supported in part by the National Natural Science Foundation of China under grant 51677162 and in part by the Natural Science Foundation of Hebei Province under grant E2017203235.

References

  1. Zhao, T., Wang, G., Bhattacharya, S.: Voltage and power balance control for a cascaded H-bridge converter-based solid-state transformer[J]. IEEE Trans. Power Electron. 28(4), 1523-1532 (2013) https://doi.org/10.1109/TPEL.2012.2216549
  2. McGrath, B.P., Holmes, D.G., Kong, W.Y.: A decentralized controller architecture for a cascaded H-bridge multilevel converter [J]. Trans. Indus. Electron. 61(3), 1160-1178 (2014)
  3. Feng, J., Chu, W.Q., Zhang, Z., Zhu, Z.Q.: Power electronic transformer-based railway traction systems: challenges and opportunities [J]. IEEE J. Emerg. Select Topics Power Electron. 6(3), 1237-1253 (2017) https://doi.org/10.1109/JESTPE.2017.2685464
  4. Calvino, L.F., Hofmann, F., Buticchi, G., et al.: Comparative analysis of multiple active bridge converters confguration in modular smart transformer[J]. IEEE Trans. Industr. Electron. 66(1), 191-202 (2019) https://doi.org/10.1109/tie.2018.2818658
  5. Zhang, J., Liu, J., Yang, J., et al.: A modifed DC power electronic transformer based on series connection of full-bridge converters [J]. IEEE Trans. Power Electron. 34(3), 2119-2133 (2019) https://doi.org/10.1109/tpel.2018.2842728
  6. Contreras, J.P., Ramirez, J.M.: Multi-fed power electronic transformer for use in modern distribution systems [J]. IEEE. Trans. Smart Grid. 5(3), 1532-1541 (2014) https://doi.org/10.1109/TSG.2013.2293479
  7. Chai, Y., Guo, Li., et al.: Hierarchical distributed voltage optimization method for HV and MV distribution networks [J]. IEEE Trans. Smart Grid. 11(2), 968-980 (2020) https://doi.org/10.1109/tsg.2019.2928701
  8. Ota, J.I.Y., Shibano, Y., Niimura, N., et al.: A phase-shiftedPWM D-STATCOM using a modular multilevel cascade converter (SSBC)-Part I: modeling, analysis, and design of current control [J]. IEEE Trans. Power Electron. 33(10), 8376-8387 (2018) https://doi.org/10.1109/tpel.2017.2785239
  9. Daorong, Lu., Zhu, J., Wang, J., et al.: A simple zero-sequencevoltage-based cluster voltage balancing control and the negative sequence Current compensation region identifcation for star-connected cascaded H-bridge STATCOM [J]. IEEE Trans. Power Electron. 33(10), 8376-8387 (2018)
  10. Jung, J.J., Lee, J.H., Sul, S.K.: Unbalance compensation analysis of multi-level static var generator with star connected series H-bridge [J]. IEEE Trans. Power Electron. 36(6), 4726-4735 (2018) https://doi.org/10.1109/TPEL.2017.2730244
  11. Chen, H.C., Wu, P.H., Lee, C.T., et al.: A fexible DC voltage balancing control based on the power fow management for star-connected cascaded H-bridge converter[J]. IEEE Trans. Industr. Appl. 52(6), 4946-4954 (2016) https://doi.org/10.1109/TIA.2016.2600667
  12. Zhao, T., Zhang, X., Mao, W., et al.: A modifed hybrid modulation strategy for suppressing DC voltage fuctuation of cascaded H-bridge photovoltaic inverter [J]. IEEE Trans. Industr. Electron. 65(5), 3932-3941 (2018) https://doi.org/10.1109/tie.2017.2758758
  13. Mao, W., Zhang, X., Zhao, T., et al.: Research on power equalization of three-phase cascaded H-bridge photovoltaic inverter based on the combination of hybrid modulation strategy and zero-sequence injection methods [J]. IEEE Trans. Industr. Electron. 67(11), 9337-9347 (2020) https://doi.org/10.1109/tie.2019.2955420
  14. Townsend, C.D., Summers, T.J., Betz, R.E.: Multigoal heuristic model predictive control technique applied to a cascaded H-bridge StatCom[J]. IEEE Trans. Power Electron. 27(3), 1191-1200 (2012) https://doi.org/10.1109/TPEL.2011.2165854
  15. Li, X., Dusmez, S., Akin, B.: A new active fault-tolerant SVPWM strategy for single-phase faults in three-phase multilevel converters [J]. IEEE Trans. Industr. Electron. 62(6), 3955-3965 (2015) https://doi.org/10.1109/TIE.2014.2364555
  16. Leon, J.I., Vazquez, S., Watson, A.J., et al.: Feed-forward space vector modulation for single-phase multilevel cascaded converters with any DC voltage ratio [J]. IEEE Trans. Industr. Electron. 56(2), 315-325 (2009) https://doi.org/10.1109/TIE.2008.926777
  17. Guo, J.: Research on simplifed SVPWM strategy for nineswitch converter[J]. J. Power Electron. 20(6), 1386-1394 (2020) https://doi.org/10.1007/s43236-020-00124-5
  18. Xinghua, T., Yongdong, L., Min, S.: Voltage-balancing method for stacked multicell converters using phase-disposition PWM[J]. IEEE Trans. Industr. Electron. 62(7), 4001-4010 (2015) https://doi.org/10.1109/TIE.2014.2387793
  19. Pamer, M., Ghias, Y.M., Pou, J., Agelidis, V.G.: Sequence pulse modulation for voltage balance in a cascaded H-bridge rectifer[J]. J. Power Electron. 17(03), 1598-2092 (2017)
  20. Ye, Z., Jiang, L., Zhang, Z., et al.: A novel DC-power control method for cascaded H-bridge multilevel inverter[J]. IEEE Trans. Industr. Electron. 64(9), 6874-6884 (2017) https://doi.org/10.1109/TIE.2017.2686798
  21. Xu, B., Tu, H., Du, Y., Yu, H.: A distributed control architecture for cascaded H-bridge converter [J]. IEEE Trans. Industr. Appl. 57(1), 845-856 (2021) https://doi.org/10.1109/TIA.2020.3039430
  22. Farivar, G., Hredzak, B., Agelidis, V.G.: Decoupled control system for cascaded H-bridge multilevel converter based STAT-COM. IEEE Trans. Industr. Electron. 63(1), 322-331 (2016) https://doi.org/10.1109/TIE.2015.2472358