Comparative study of small-signal stability under weak AC system integration for different VSCs

Lu, Xiaojun and Xiang, Wang and Lin, Weixing and Wen, Jinyu (2020) Comparative study of small-signal stability under weak AC system integration for different VSCs. IEEE Journal of Emerging and Selected Topics in Power Electronics. ISSN 2168-6777

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    Abstract

    Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs),underweak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

    ORCID iDs

    Lu, Xiaojun, Xiang, Wang ORCID logoORCID: https://orcid.org/0000-0002-4619-5849, Lin, Weixing and Wen, Jinyu;