Optimal Control Strategy of Modular Multilevel Converter to Mitigate Solar Panel Unbalance Grid Condition

The usage of Multi-level inverter has become a very prominent in past years on account of the low distortion outputs, reduced dv/dt stresses and excessive switching frequency. Multi-level Inverter system are power converters frame works made by a cluster of power semiconductors sources which when appropriately associated and controlled, can create a multi-step voltage waveform with variable and controlled phase, frequency and amplitude. This study deals with a three-phase eleven level inverter system connected to grid using GTO as a switching element and for the direct current source solar photovoltaic array is used. The inverter topology considered here is the Cascaded MLI. The above-mentioned system is simulated in MATLAB Simulink with SPWM control, executed for the inverter. THD of the proposed three-phase eleven level cascaded MLI topology has been discussed with the help of FFT analysis under various grid conditions.