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Improved Modular Flying Capacitor Converter Based Grid-Tied Hybrid Wind Solar Energy System

An improved bidirectional modular flying capacitor multilevel converter (MFCMLC) for medium voltage high power transformer-less grid-tied hybrid wind solar energy system (HWSES) application is proposed in this work. In comparison to conventional cascaded H-bridge converter with the same number of semiconductor switches and equal voltage stress across the switches the power handling capacity of proposed converter is approximately doubled along with maintaining power quality as per grid standards. Moreover, under distinct environmental conditions the adopted converter with proposed control and switching strategy is able to handle the inherent power imbalances that occur not only between the different cells of a phase but also within each cell. The effectiveness of the proposed system and its performance are analyzed in MATLAB/Simulink environment.