Journal of Power Electronics

  • 제24권7호
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  • Pages.1035-1046
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  • 2024
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Optimized low switching frequency modulation with neutral point voltage control for three-level converters

  • Bo Guan (School of Electrical Engineering, Chongqing University) ;
  • Chuanchuan Luo (School of Electrical Engineering, Chongqing University) ;
  • Xiaoliang Zhen (School of Electrical Engineering, Chongqing University)
  • 투고 : 2023.08.03
  • 심사 : 2024.02.07
  • 발행 : 2024.07.20
⟨ 이전 논문 다음 논문 ⟩

초록

The use of three-level converters with low switching frequency (SF) modulation is urgently needed for medium voltage high power applications. However, since it is not possible to frequently adjust the injected zero-sequence voltage and duty time of redundant vectors, the neutral point (NP) voltage problem of three-level converters becomes a tricky issue under low SFs. In this paper, an optimized low SF modulation with NP voltage control is proposed, which is based on half-wave symmetry selective harmonic elimination pulse width modulation. The proposed modulation specifically addresses the low-frequency NP voltage fluctuation of three-level converters, using the amplitude and phase of the 3n-order harmonics as degrees of freedoms (DOFs). In addition, it actively optimizes the control problem into constraint equations. By revealing the relationship between these new DOFs and low-frequency NP voltage fluctuation, and obtaining the optimum settings for the new DOFs, the newly established constraint equations can naturally suppress the low-frequency NP voltage fluctuation, without the need for real-time switching angle adjustments. It fits very well with the feature that switching angles can only be calculated offline and used via a table online. Experimental results show the validity and feasibility of the proposed modulation strategy.

키워드

과제정보

This work was supported partly by the National Natural Science Foundation of China under Grant 52107178, partly by the Natural Science Foundation of Chongqing under Grant cstc2020jcyj-msxmX0498.

참고문헌

  1. Peng, T., et al.: A uniform modeling method based on open-circuit faults analysis for NPC-three-level converter. IEEE Trans. Circuits Syst. II Express Briefs 66(3), 457-461 (2019)
  2. Yang, Y., et al.: improved model predictive current control for three-phase three-level converters with neutral-point voltage ripple and common mode voltage reduction. IEEE Trans. Energy Convers. 36(4), 3053-3062 (2021) https://doi.org/10.1109/TEC.2021.3073256
  3. Edpuganti, A., Rathore, A.K.: A survey of low switching frequency modulation techniques for medium-voltage multilevel converters. IEEE Trans. Ind. Appl. 51(5), 4212-4228 (2015) https://doi.org/10.1109/TIA.2015.2437351
  4. Sadigh, A.K., Dargahi, V., Corzine, K.A.: Analytical determination of conduction and switching power losses in flying-capacitor-based active neutral-point-clamped multilevel converter. IEEE Trans. Power Electron. 31(8), 5473-5494 (2016) https://doi.org/10.1109/TPEL.2015.2498107
  5. Li, K., Wei, M., Xie, C., Deng, F., Guerrero, J.M., Vasquez, J.C.: Triangle carrier-based DPWM for three-level NPC inverters. IEEE J. Emerg. Sel. Top. Power Electron. 6(4), 1966-1978 (2018) https://doi.org/10.1109/JESTPE.2018.2812704
  6. Wang, C., Wang, K., You, X.: Research on synchronized SVPWM strategies under low switching frequency for six-phase VSI-fed asymmetrical dual stator induction machine. IEEE Trans. Ind. Electron. 63(11), 6767-6776 (2016) https://doi.org/10.1109/TIE.2016.2585459
  7. Arumalla, R.T., Figarado, S., Panuganti, K., Harischandrappa, N.: Selective lower order harmonic elimination in DC-AC converter using space vector approach. IEEE Trans. Circuits Syst. II Express Briefs 68(8), 2890-2894 (2021)
  8. Gao, Z., Zhao, L., Ge, Q., Li, Y., Zhang, B.: Neutral-point voltage balancing strategy for three-level neutral point clamped inverter based on on-line calculating redundant vector duty cycles. In: Proc. Int. Conf. on Electr. Mach. and Sys. pp. 1-6 (2019)
  9. 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(5), 642-651 (2012) https://doi.org/10.1109/TPEL.2010.2050783
  10. Guan, B., Doki, S.: Optimal two degrees-of-freedom based neutral point potential control for three-level neutral point clamped converters. J. Power Electron. 19(1), 119-133 (2019)
  11. Guo, F., Yang, T., Diab, A.M., Yeoh, S.S., Bozhko, S., Wheeler, P.: An Enhanced virtual space vector modulation scheme of three-level NPC converters for more-electric-aircraft applications. IEEE Trans. Ind. Appl. 57(5), 5239-5251 (2021) https://doi.org/10.1109/TIA.2021.3085798
  12. Lak, M., Chuang, B.-R., Wu, T.-L., Lee, T.-L.: A novel hybrid modulation for photovoltaic three-level T-type inverter to simultaneously eliminate neutral-point voltage ripple and interact with maximum power point tracking process. In: Proc. IEEE Ener. Conver. Cong. and Expo. pp. 1-6 (2020)
  13. Guan, B., Liu, Z.: Hybrid modulation strategy with neutral point potential balance of T-type three-level converter under switch open-circuit fault. IEEE Trans. Ind. Electron. 69(14), 10797-10806 (2022) https://doi.org/10.1109/TIE.2021.3120477
  14. Pan, J., Yang, Y., Cai, H., Xu, L.: Capacitor voltage fluctuation minimization for four-level hybrid clamped converter using improved common-mode voltage injection. IEEE Trans. Power Electron. 35(7), 7563-7573 (2020)
  15. Dahidah, M.S.A., Konstantinou, G., Agelidis, V.G.: A review of multilevel selective harmonic elimination PWM: formulations, solving algorithms, implementation and applications. IEEE Trans. Power Electron. 30(8), 4091-4106 (2015) https://doi.org/10.1109/TPEL.2014.2355226
  16. Sadoughi, M., Pourdadashnia, A., Farhadi-Kangarlu, M., Galvani, S.: PSO-optimized SHE-PWM technique in a cascaded H-bridge multilevel inverter for variable output voltage applications. IEEE Trans. Power Electron. 37(7), 8065-8075 (2022) https://doi.org/10.1109/TPEL.2022.3146825
  17. Yang, K., et al.: Unified selective harmonic elimination for multilevel converters. IEEE Trans. Power Electron. 32(2), 1579-1590 (2017) https://doi.org/10.1109/TPEL.2016.2548080
  18. Wu, M., Xue, C., Li, Y.W., Yang, K.: A generalized selective harmonic elimination PWM formulation with common-mode voltage reduction ability for multilevel converters. IEEE Trans. Power Electron. 36(9), 10753-10765 (2021) https://doi.org/10.1109/TPEL.2021.3063299
  19. Perez-Basante, A., Ceballos, A.S., Pou, J., Kortabarria, I., Alegria, I.M.D.: A universal formulation for multilevel selective-harmonic-eliminated PWM with half-wave symmetry. IEEE Trans. Power Electron. 34(1), 943-957 (2019) https://doi.org/10.1109/TPEL.2018.2819724
  20. Liu, Z., Guan, B.: Active optimization method for power loss distribution in T-type three-level converter under half-wave symmetry SHEPWM. IEEE Trans. Ind. Electron. (2023). https://doi.org/10.1109/TIE.2022.3224160
  21. Hu, C., Holmes, G., Shen, W., Yu, X., Wang, Q., Luo, F.: Neutral-point potential balancing control strategy of three-level active NPC inverter based on SHEPWM. IET Power Electron. 10(4), 1943-1950 (2017) https://doi.org/10.1049/iet-pel.2017.0229
  22. Zhang, X.-H., Yue, W.-K.: Neutral point potential balance algorithm for three-level NPC inverter based on SHEPWM. IET Electron. Lett. 53, 1542-1544 (2017) https://doi.org/10.1049/el.2017.3191
  23. Sanchez-Ruiz, A., et al.: DC-link neutral point control for 3L-NPC converters utilizing selective harmonic elimination PWM. IEEE Trans. Ind. Electron. 69(9), 8633-8644 (2022) https://doi.org/10.1109/TIE.2021.3113019
  24. Guan, B., Doki, S.: A current harmonic minimum PWM for three-level converters aiming at the low-frequency fluctuation minimum of neutral-point potential. IEEE Trans. Ind. Electron. 66(5), 3380-3390 (2019)  https://doi.org/10.1109/TIE.2018.2851995