Journal of Power Electronics

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

DOI QR Code

Analysis of distortions in switch drives and currents related to balance strategy with sort method in MMC systems

  • Wang, Chuyang (College of Energy and Electrical Engineering, Hohai University) ;
  • Xiao, Lan (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Zhang, Li (College of Energy and Electrical Engineering, Hohai University) ;
  • Wu, Feng (College of Energy and Electrical Engineering, Hohai University) ;
  • Liu, Qi (College of Energy and Electrical Engineering, Hohai University)
  • Received : 2019.07.11
  • Accepted : 2019.09.29
  • Published : 2020.03.20
⟨ Previous Next ⟩

Abstract

The traditional balance strategy with a sort method has some disadvantages and can cause different types of deteriorations in an MMC system, including an increase in the switching frequency and distortions in the currents. However, quantitative analyses for these deteriorations are neglected during the design of the balance strategy, which decreases the effect of the strategy. This paper first develops accurate descriptions for an MMC system and the structure of its balance strategy. Based on these descriptions, the root cause and quantitative degree of the switching frequency increase are both determined for the first time. A quantitative analysis for the degree of the current distortion is obtained as well. Based on the above analysis, a state switcher and balancing-time calculator are proposed and introduced into the balance strategy, which effectively decrease the magnitudes of these deteriorations. The deteriorations caused by the traditional balance strategy and efficiency of the improved balance strategy are finally demonstrated via experimental results.

Keywords

Acknowledgement

This work was supported in part by the National Natural Science Foundation of China under Grant 61673210, and in part by the 16th Six Talent Peaks Project in Jiangsu Province under Grant TD-XNY-001, and in part by the 111 project under Grant B14022.

References

  1. Saeedifard, M., Iravani, R.: Dynamic performance of a modular multilevel back-to-back HVDC system. IEEE Trans. Power Del. 25(4), 2903-2912 (2010) https://doi.org/10.1109/TPWRD.2010.2050787
  2. Guan, M., Xu, Z.: Modeling and control of a modular multilevel converter-based HVDC system under unbalanced grid conditions. IEEE Trans. Power Electron. 27(12), 4858-4867 (2012) https://doi.org/10.1109/TPEL.2012.2192752
  3. Jiangchao, Q., Saeedifard, M.: Predictive control of a modular multilevel converter for a back-to-back HVDC system. IEEE Trans. Power Del. 27(3), 1538-1547 (2012) https://doi.org/10.1109/TPWRD.2012.2191577
  4. Kumar, Y.S., Poddar, G.: Medium-voltage vector control induction motor drive at zero frequency using modular multilevel converter. Trans. Ind. Electron. 65(8), 125-132 (2018) https://doi.org/10.1109/TIE.2017.2721927
  5. Dorn, J.,Huang, H., Retzmann, D.: Novel voltage-sourced converters for HVDC and FACTS applications. Presented at the Conference on Cigre Symposium, Osaka, Japan, 2007
  6. Rohner, S., Bernet, S., Hiller, M., Sommer, R.: Modulation, losses, and semiconductor requirements of modular multilevel converters. IEEE Trans. Ind. Electron. 57(8), 2633-2642 (2010) https://doi.org/10.1109/TIE.2009.2031187
  7. Hagiwara, M., Akagi, H.: Control and experiment of pulse-width modulated modular multilevel converters. IEEE Trans. Power Electron. 24(7), 1737-1746 (2009) https://doi.org/10.1109/tpel.2009.2014236
  8. Kumar, Y.S., Poddar, G.: Control of medium voltage AC motor drive for wide speed range using modular multilevel converter. Trans. Ind. Electron. 64(4), 2742-2749 (2017) https://doi.org/10.1109/TIE.2016.2631118
  9. Binbin, L., Rongfeng, Y., Dandan, X., Gaolin, W., Wei, W., Dianguo, X.: Analysis of the phase shifted carrier modulation for modular multilevel converters. IEEE Trans. Power Electron. 30(1), 297-310 (2015) https://doi.org/10.1109/TPEL.2014.2299802
  10. Ilves, K., Antonopoulos, A., Norrga, S., Nee, H.-P.: A new modulation method for the modular multilevel converter allowing fundamental switching frequency. IEEE Trans. Power Electron. 27(8), 3482-3494 (2012) https://doi.org/10.1109/TPEL.2012.2185832
  11. Huber, J., Korn, A.: Optimized pulse pattern modulation for modular multilevel converter high-speed drive. In: Proceedings of International Power Electronics and Motion Control Conference, 2012, pp. LS1a-1.4-1-LS1a-1.4-7
  12. Deng, F., Chen, Z.: A control method for voltage balancing in modular multilevel converters. IEEE Trans. Power Electron. 29(1), 66-76 (2014) https://doi.org/10.1109/TPEL.2013.2251426
  13. Rohner, S., Bernet, S., Hiller, M., Sommer, R.: Modelling, simulation and analysis of a modular multilevel converter for medium voltage applications. In: Proceedings of the IEEE International Conference on Industrial Technology, 2010, pp. 775-782
  14. Saeedifard, M., Iravani, R.: Dynamic performance of a modular multilevel back-to-back HVDC system. In: 2011 IEEE Power and Energy Society General Meeting, San Diego, CA, 2011, pp. 1-1
  15. Debnath, S., Saeedifard, M.: A new hybrid modular multilevel converter for grid connection of large wind turbines. IEEE Trans. Sust. Energy 4(4), 1051-1064 (2013) https://doi.org/10.1109/TSTE.2013.2266280