Steady-State Operating Range of MMC-HVDC

doi:10.3969/j.issn.1000-7229.2015.03.001

Abstract

Abstract:

This paper studied the influence of AC system on the operating range of MMC-HVDC （modular multilevel converter-high voltage direct current） under steady-state condition, and analyzed the key factors to limit the DC power transmission capacity. Firstly, the equivalent mathematical model of a one-terminal MMC-HVDC was derived. Secondly, the impacts of the short circuit ratio （SCR） of AC system, the capacities of converter transformer and converter station on the steady-state operating range of converter station were studied. Lastly, this paper analyzed the influence of the parallel reactive power compensator on the operating range of MMC-HVDC. The calculation results show that: the operating range of MMC-HVDC is mostly limited by the converter transformer capacity under large SCR of AC system; while the operating range is largely depended on the value of SCR under small SCR. Additionally, the use of reactive power compensator can improve the operating range of MMC-HVDC.

Key words: modular multilevel converter （MMC）, VSC-HVDC, steady-state operating range, short circuit ratio , of AC system, reactive power compensator, converter transformer capacity

ZHANG Jing，SUN Weizhen，FEI Jianping，LIU Mingkang，ZHANG Zheren，XU Zheng. Steady-State Operating Range of MMC-HVDC[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(3): 1-6.

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