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Joint Limiting Control Strategy Based on Virtual Impedance Shaping for Suppressing DC fault current and Arm current in MMC-HVDC Systems

引用

Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 2003-2014页

作者： Qin Jiang Yan Tao Baohong Li Tianqi Liu Zhe Chen Frede Blaabjerg Peng Wang IEEE College of Electrical Engineering Sichuan UniversityChengdu 610065China Smart Grid Key Laboratory of Sichuan Province Chengdu610065China State Grid Jiangsu Electric Power Company Research Institute Nanjing 211103China Department of Energy Technology Aalborg UniversityAalborg 9920Denmark School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

This paper proposes a joint limiting control strategy for suppressing DC fault current and arm current in modular multilevel converter-based high-voltage direct current(MMC-HVDC) systems, which includes two target-oriented current limiting controls. To limit the DC fault current in the early fault stage, an equivalent modular multilevel converter(MMC) impedance is obtained, and its high-frequency part is reshaped by introducing virtual impedance, which is realized by adjusting the inserted submodules adaptively. Following the analysis of MMC control characteristics, the arm current limiting strategy is investigated, with results showing that the inner-loop control has significant effects on arm current and that a simple low-pass filter can reduce the arm current in the fault period. Finally, by combining the virtual impedance shaping and innerloop control, the fault currents of DC lines and MMC arms can be suppressed simultaneously, which can not only alleviate the interrupting pressure of the DC circuit breaker, but also prevent the MMC from being blocked by the arm overcurrent. Theoretical analysis conclusions and the proposed strategy are verified offline by a digital time-domain simulation on Power Systems Computer Aided Design/Electromagnetic Transients including DC platform, and experiment on a real-time digital simulator platform.

关键词： Modular multilevel converter(MMC) highvoltage direct current(HVDC)transmission direct current fault fault current limitation arm current suppression virtual impedance direct current circuit breaker

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