Impact of Model Complexity on Mixed AC/DC Transient Stability Analysis

Model complexity may have a significant impact on transient stability results of mixed AC/DC systems. The dynamics of various mixed AC/DC models with a focus on different generator orders and multi-level modular converter (MMC) VSCHVDC model types is investigated within this paper. MMC VSC-HVDC converter models are based on average value model (AVM) and simplified AVM, while 2 nd , 3 rd and 6 th order generator models are formulated within the research. The paper also considers the impact of inner current control bandwidth. Based on the simulation result, substantial change over the transient stability result is seen with respect to different types of modelling complexity used within the research.

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