Several types of MMC models were presented in [10]. To
achieve small-signal dynamic studies, an average model (AVM) of a
VSC–MMC station is used. The AVM model referred to as the MMC
Model #4 in [10], is shown in Fig. 1. Cdc is the equivalent capacitor
ofthe MMC. Larm and Rarm refer to the reactor and resistance of each
arm.