Finite Control Set Model Predictive Control Strategy for MMC Arm Current With DC Bus Voltage Stabilization Under Unbalanced Grid Conditions

ABSTRACT Finite Control Set Model Predictive Control (FCS‐MPC) is widely used in Modular Multilevel Converters (MMC), but it faces challenges such as heavy computational burden and the complexity of designing weighting factors. Unbalanced grid voltage conditions frequently occur, and for grid‐connected MMC with passive loads, the stability of the DC bus voltage is crucial. To address these issues, this paper proposes an arm current finite control set model predictive control strategy based on three‐phase coupled modeling, along with a compensation mechanism for stabilizing the DC voltage. The proposed method is independent of the number of submodules and does not require weighting factor design, while effectively stabilizing the DC bus voltage without compromising the system's control objectives.