Research on the Modeling of MMC-HVDC Considering the Fault Ride-through Characteristics

Modular multilevel converter (MMC) is widely used in VSC-HVDC. And FRT (fault ride through) is one of the most important issues. In order to simulate the MMC-HVDC fault ride-through characteristics more accurately, this paper focuses on the detailed simulation models, and a probability Thévenin's equivalent model of MMC is proposed. This paper also proposes a modeling framework that can support three processes: normal state, FRT, and fault recovery stage. The possibility MMC model and control strategies are realized based on an actual VSC-HVDC project in PSModel software. By comparing with the PACAD model provided by the actual manufacturer, the efficacy of the model and control strategy is verified.