A voltage balancing method applied to direct control strategy of MMC-VSC-HVDC

The proposed balancing method [10] of sub-module capacitor voltage of modular multilevel converter (MMC) in this paper is applied to one of the applications, HVDC power transmission i.e. MMC-VSC-HVDC. One of the control strategies of MMC-VSC-HVDC i.e. direct control strategy has been comprehensively simulated to prove the effectiveness and versatility of balancing method. To prove the robustness of the balancing method, the variation of the parameters such as active and reactive power is made to around 0.5pu on positive as well as negative sides. The simulation is done in MATLAB software.