Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Development and Testing of a 10 kV 1.5 kA Mobile DC De-Icer based on Modular Multilevel Converter with STATCOM Function

  • Hu, Pengfei (School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China) ;
  • Liang, Yiqiao (Zhejiang Guirong Xieping Technology Co., Ltd.) ;
  • Du, Yi (Power Economic Research Institute of State Grid Fujian Electric Power Company) ;
  • Bi, Renming (Zhejiang Guirong Xieping Technology Co., Ltd.) ;
  • Rao, Chonglin (Zhejiang Guirong Xieping Technology Co., Ltd.) ;
  • Han, Yang (School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China)
  • Received : 2017.05.25
  • Accepted : 2017.11.18
  • Published : 2018.03.20
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Abstract

This paper introduces the development of a de-icer based on a full-bridge modular multilevel converter (FMMC). The FMMC can generate a wide range of DC voltages owing to its modularity, scalability, and redundancy, which makes it suitable for ice-melting applications. First, operating principles and voltage ranges are analyzed when FMMC is applied as a mobile de-icer. Second, two new startup strategies, constant modulation index and constant power startup strategies, are proposed. Third, the main control strategies of the de-icer are proposed. Fourth, a novel rated-current zero-power test scheme is proposed to simplify test conditions. Finally, a 10 kV 1.5 kA mobile MMC de-icer is designed and built, and experiments are carried out to validate the proposed startup, control strategies, and rated-current zero-power test scheme.

Keywords

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Fig. 1. Circuit topology of the mobile DC de-icer based on MMC.

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Fig. 2. Equivalent circuit of the MMC de-icer: (a) AC loop, (b)DC loop.

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Fig. 3. Operating range of DC voltage modulation indexes of theFMMC and HMMCs.

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Fig. 4. Startup process of the proposed startup strategies.

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Fig. 5. Single-phase equivalent circuit and vector diagram.

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Fig. 6. Constant modulation index charging strategy.

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Fig. 7. Constant power charging strategy.

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Fig. 8. Average voltage of all SMs and reactive power control.

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Fig. 9. De-icing current and phase average voltage control.

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Fig. 10. Individual SM voltage control.

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Fig. 11. PSC-PWM modulation block diagram.

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Fig. 12. Photographs of the 10 kV 1.5 kA mobile MMC de-icer.(a) Appearance of the whole system. (b) A section of the SMbank. (c) Single power module.

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Fig. 13. Electrical diagram of zero-power experiment scheme.

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Fig. 14. SM average voltages during the startup procedure.

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Fig. 15. Arm currents during the startup process.

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Fig. 16. Line-to-line voltages of the utility grid.

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Fig. 17. Dc, AC, and arm currents on rated ice-melting currentzero-power condition.

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Fig. 18. SM average voltages of six arms on rated ice-meltingcurrent zero-power condition.

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Fig. 19. SM average voltages of six arms on rated ice-meltingcurrent zero-power condition.

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Fig. 20. SM average voltages of six arms on rated STATCOMcondition.

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Fig. 21. Currents and SM average voltage of phase-a on thede-icing transient condition.

TABLE I MAIN-CIRCUIT PARAMETERS OF 10 KV 1.5 KA MMC DE-ICER

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TABLE II MAIN-CIRCUIT PARAMETERS FOR THE MMC DE-ICER

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