Harmonic Reduction in Circulating Current for Modular Multi-Level Converter Using Repetitive Control Scheme and Fuzzy Logic

In modular multilevel converter (MMC), the sub modules which perform switching actions, it may produce higher order harmonics when involved with fluctuating capacitor voltages and when it gets superimposed with the circulating currents, it will increase their magnitude which results into increased system losses. The proposed model is designed for three phase applications and the simulation results clearly define the effectiveness of the control mechanism.