Fractional Order Controlled Multilevel Boost Hybrid Converter

The field which is gathering research momentum in the recent days is the achievement of multilevel output for huge voltage and power renewable applications. Especially, multilevel inverter (MLI) for solar photovoltaic (SPV) has gained more attention. The main advantages of MLI are reduced total harmonic distortion and improved quality of output voltage. These MLI produce only AC output. But the SPV residential system requires both AC and DC outputs. This is achieved by proposing a multilevel boost hybrid converter (MBHC) which generates simultaneous multilevel AC output and three single DC outputs. This configuration increases the output voltage more than twice that of the conventional MLI, with the same number of power switches. Thus it increases the reliability and efficiency of the system. The demonstration of proposed system is verified successfully using MATLAB/Simulink simulation. The closed loop control of the proposed system is developed by using fractional order proportional integral (FOPI) controller, integer order proportional integral (PI) controller. Both PI and FOPI controller based MBHC, were tested with reference, load and line variation. With these two controllers, the frequency response of MBHC is also compared and presented. The compared results show that the FOPI based MBHC is superior than the conventional controller based MBHC.