Deadbeat control of MMC with reduced sensors for robustness enhancement

摘要

As common submodule (SM) capacitor voltage measuring method of modular multilevel converter(MMC) requiring large number of voltage sensors, submodule voltage measuring technique based on observation is then introduced to reduce voltage sensors. However, observed submodule capacitor voltage has a strong dependence on the parameters, which will reduce the robustness of MMC control system. In this paper, a deadbeat control method for MMC with reduced sensors is proposed to enhance the robustness, which is just uses the arm bridge current and the load current reference value as the control input to improve the robustness of the operation performance. Simulation and experimental results have proven the effectiveness of the proposed control method.