THD ANALYSIS OF PV-FED PWM CONTROLLED MLI USING LEVEL SHIFTED MULTICARRIER MODULATON TECHNIQUE

Electrical Engineering

In India the demand of electric power is increasing rapidly, at present the maximum generation of electric power is based on non-renewable energy sources. In future there lies the use of renewable energy recourses to satisfy increasing power demand and needs, among all renewable energy sources solar energy is most easily available and most comfortably used. For utilizing solar energy for generation of electric power solar cell or solar panel is mostly used. Available power from solar cell is DC in nature, but for utilization of this power for domestic purpose, it is needed to be converted in to AC. Inverter is the power electronic modulator that is used for this purpose. Multilevel cascade type inverter which intake multiple DC sources and gives combined AC output for desired voltage and frequency. In this project, single phase 5 level cascaded H-bridge multilevel inverter is implemented and investigation is carried out for multicarrier PWM technique at the end of the thesis. Report presents a bibliographical review of cascaded H-bridge MLI, control techniques, future scopes and some of applications. Simulation for 5 level cascaded H-bridge MLI has been carried out in MATLAB/Simulink and the investigation is made in terms of total harmonic distortion (THD). The computational results are demonstrated graphically for better understanding and to prove the effectiveness of the individual PWM technique.

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