전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제25권1호
  • /
  • Pages.61-67
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  • 2020
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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전력계통 전압 변동과 순환 전류 보상 성분을 고려한 MMC 기반 VSC-HVDC의 최대 변조 지수 선정에 관한 연구

Maximum Modulation Index of VSC HVDC based on MMC Considering Compensation Signals and AC Network Conditions

  • 투고 : 2019.07.19
  • 심사 : 2019.11.05
  • 발행 : 2020.02.20
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초록

This study deals with the modulation index (MI) of a voltage source converter (VSC) HVDC system based on a modular multilevel converter (MMC). In the two-level converter, the purpose of the MI is to maximize the achievable AC voltage of the converter from a fixed DC voltage. Unlike that in a two-level converter, the MI in the MMC topology plays a role in making the converter a voltage source using a capacitor. The circulating current in the MMC distorts the AC voltage reference, and the distortion affects the MI. In addition, the AC network conditions, such as AC voltage variation and reactive power, affect the MI. Therefore, the MI should be optimized with consideration of internal and external factors. This study proposes a method to optimize the MI of an MMC HVDC system.

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참고문헌

  1. A. Lesnicar and R. Marquardt, "An innovative moduar multilevel converter topology suitable for a wide power range," in Proc. Power Tech Conf., Vol. 3, pp. 1-6, 2003.
  2. A. Lesnicar and R. Marquardt, "New concept for high voltage-modular multilevel converter," in Power Electronics Specialist Conf., Aachen, Germany, pp. 1-5, 2004.
  3. Y. Li, X. Shi, F. Wang, and W. Lei, "Maximum modulation index for modular multilevel converter with circulating current control," in Proc. IEEE ECCE, pp. 491-498, 2014.
  4. K. Sharifabadi, L. Harnefors, H, Nee, S. Norrga, and R. Teodoresu, Design, control, and application of modular multilevel converters for HVDC transmission systems, Wiley, 2016.
  5. R. Li, J. E. Fletcher, and B. W. Williams, "Influence of third harmonic injection on modular multilevel converter-based high-voltage direct current transmission systems," IET Gener., Transm. Distrib., Vol. 10, No. 11, pp. 2764-2770, 2016. https://doi.org/10.1049/iet-gtd.2015.1470