Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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A Dynamic Power Distribution Strategy for Large-scale Cascaded Photovoltaic Systems

  • Wang, Kangan (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Wu, Xiaojie (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Deng, Fujin (School of Electrical Engineering, Southeast University) ;
  • Liu, Feng (School of Electrical and Power Engineering, China University of Mining and Technology)
  • Received : 2016.09.04
  • Accepted : 2017.05.30
  • Published : 2017.09.20
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Abstract

The cascaded H-bridge (CHB) multilevel converter is a promising topology for large-scale photovoltaic (PV) systems. The output voltage over-modulation derived by the inter-module active power imbalance is one of the key issues for CHB PV systems. This paper proposed a dynamic power distribution strategy to eliminate the over-modulation in a CHB PV system by suitably redistributing the reactive power among the inverter modules of the CHB PV system. The proposed strategy can effectively extend the operating region of the CHB PV system with a simple control algorithm and easy implementation. Simulation and experimental results carried out on a seven-level CHB grid-connected PV system are shown to validate the proposed strategy.

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References

  1. European Photovoltaic Industry Association, Global Market Outlook for Photovoltaics 2016-2020, 2016.
  2. S. Kouro, J. I. Leon, D. Vinnikov, and L. G. Franquelo, "Grid-connected photovoltaic systems: An overview of recent research and emerging PV converter technology," IEEE Ind. Electron. Mag., Vol. 9, No. 1, pp. 47-61, Mar. 2015. https://doi.org/10.1109/MIE.2014.2376976
  3. J. Sastry, P. Bakas, H. Kim, L. Wang, and A. Marinopoulos, "Evaluation of cascaded h-bridge inverter for utility-scale photovoltaic systems," Renew. Energy, Vol. 69, pp.208-218, Sep. 2014. https://doi.org/10.1016/j.renene.2014.03.049
  4. S. Kouro, M. Malinowski, K. Gopakumar, J. Pou, and L. G. Franquelo, "Recent advances and industrial applications of multilevel converters," IEEE Trans. Ind. Electron., Vol. 57, No. 8, pp. 2553-2580, Aug. 2010. https://doi.org/10.1109/TIE.2010.2049719
  5. W. Zhao, H. Choi, G. Konstantinou, M. Ciobotaru, and V. G. Agelidis, "Cascaded h-bridge multilevel converter for large-scale PV grid-integration with isolated DC-DC stage," in Power Electronics for Distributed Generation Systems (PEDG), 2012 3rd IEEE International Symposium on, pp. 849-856, 2012.
  6. Y. Zhou and H. Li, "Analysis and suppression of leakage current in cascaded-multilevel-inverter-based PV systems," IEEE Trans. Power Electron., Vol. 29, No. 10, pp. 5265-5277, Oct. 2014. https://doi.org/10.1109/TPEL.2013.2289939
  7. P. Sochor and H. Akagi, "Theoretical comparison in energy-balancing capability between star- and delta-configured modular multilevel cascade inverters for utility-scale photovoltaic systems," IEEE Trans. Power Electron., Vol. 31, No. 3, pp. 1980-1992, Mar. 2016. https://doi.org/10.1109/TPEL.2015.2442261
  8. Y. Yu, G. Konstantinou, B. Hredzak, and V. G. Agelidis, "Operation of cascaded h-bridge multilevel converters for large-scale photovoltaic power plants under bridge failures," IEEE Trans. Industrial Electron., Vol. 62, No. 11, pp. 7228-7236, Nov. 2015. https://doi.org/10.1109/TIE.2015.2434995
  9. C. D. Townsend, Y. Yu, G. Konstantinou and V. G. Agelidis, "Cascaded h-bridge multilevel PV topology for alleviation of per-phase power imbalances and reduction of second harmonic voltage ripple," IEEE Trans. Power Electron., Vol. 31, No. 8, pp. 5574-5586, Aug. 2016. https://doi.org/10.1109/TPEL.2015.2497707
  10. Y. Yu, G. Konstantinou, B. Hredzak, and V. G. Agelidis, "Power balance optimization of cascaded h-bridge multilevel converters for large-scale photovoltaic integration," IEEE Trans. Power Electron, Vol. 31, No. 2, pp. 1108-1120, Feb. 2016. https://doi.org/10.1109/TPEL.2015.2407884
  11. J. Chavarria, D. Biel, F. Guinjoan, C. Meza, and J. J. Negroni, "Energy-balance control of PV cascaded multilevel grid-connected inverters under level-shifted and phase-shifted PWMs," IEEE Trans. Ind. Electron., Vol. 60, No. 1, pp. 98-111, Jan. 2013. https://doi.org/10.1109/TIE.2012.2186108
  12. M. Coppola, F. Di Napoli, P. Guerriero, D. Iannuzzi, S. Daliento, and A. Del Pizzo, "An FPGA-based advanced control strategy of a grid-tied PV CHB inverter," IEEE Trans. Power Electron., Vol. 31, No. 1, pp. 806-816, Jan. 2016. https://doi.org/10.1109/TPEL.2015.2405416
  13. E. Villanueva, P. Correa, J. Rodriguez, and M. Pacas, "Control of a single-phase cascaded H-bridge multilevel inverter for grid-connected photovoltaic systems," IEEE Trans. Ind. Electron., Vol. 56, No. 11, pp. 4399-4406, Nov. 2009. https://doi.org/10.1109/TIE.2009.2029579
  14. B. Xiao, L. Hang, J. Mei, C. Riley, L. M. Tolbert, and B. Ozpineci, "Modular cascaded h-bridge multilevel PV inverter with distributed MPPT for grid-connected applications," IEEE Trans. Ind. Appl., Vol. 51, No. 2, pp. 1722-1731, Mar. 2015. https://doi.org/10.1109/TIA.2014.2354396
  15. Q. Huang, W. Yu, and A. Q. Huang, "Independent DC link voltage control of cascaded multilevel PV inverter," in Proc 2016 APEC, pp. 2727-2734, 2016.
  16. A. Eskandari, V. Javadian, H. Iman-Eini, and M. Yadollahi, "Stable operation of grid connected cascaded h-bridge inverter under unbalanced insolation conditions," in Proc. EPECS, pp. 1-6, 2013.
  17. M. Miranbeigi and H. Iman-Eini, "Hybrid modulation technique for grid-connected cascaded photovoltaic systems," IEEE Trans. Ind. Electron., Vol. 63, No. 12, pp. 7843-7853, Dec. 2016. https://doi.org/10.1109/TIE.2016.2580122
  18. L. Liu, H. Li, Y. Xue, and W. Liu, "Decoupled active and reactive power control for large-scale grid-connected photovoltaic systems using cascaded modular multilevel converters," IEEE Trans. Power Electron., Vol. 30, No. 1, pp. 176-187, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2304966
  19. L. Liu, H. Li, Y. Xue, and W. Liu, "Reactive power compensation and optimization strategy for grid-interactive cascaded photovoltaic systems," IEEE Trans. Power Electron., Vol. 30, No. 1, pp. 188-202, Jan. 2015. https://doi.org/10.1109/TPEL.2014.2333004
  20. Thin-film Terrestrial Photovoltaic (PV) Modules-Design Qualification and Type Approval, IEC61646, 2008
  21. H. Choi, W. Zhao, M. Ciobotaru, and V. Agelidis, "Large-scale PV system based on the multiphase isolated dc/dc converter," in Proc. IEEE PEDG 2012, pp. 801-807, 2012.
  22. J. Echeverria, S. Kouro, M. Perez, and H. Abu-Rub, "Multi-modular cascaded dc-dc converter for hvdc grid connection of large-scale photovoltaic power systems," in Proc. IEEE IECON 2013, pp. 6999-7005, 2013.
  23. S. Xu, A. Q. Huang, T. Zhao, and G. Wang, "Coupling effect reduction of a voltage-balancing controller in single-phase cascaded multilevel converters," IEEE Trans. Power Electron., Vol. 27, No. 8, pp. 3530-3543, Aug. 2012. https://doi.org/10.1109/TPEL.2012.2186615