AC Motor Drive Fed by Renewable Energy Sources with PWM

In this fast approaching nature of technology the need of Electricity becomes a mandatory in developing technology. The need of Electricity increases the power demand where the power demand met by the conventional sources of energy has some disadvantage of pollution, this disadvantage can be decreased by the use of the Renewable energy sources like Fuel Cell and available solar energy. When a FUEL cell produces AC power, basically two stages are required for conversion first a boosting stage and second is inversion stage. In this paper the Boost inverter topology is achieved where in the conventional methods the normal DC ? AC power conversion method is used where as in this paper the PWM based DC ? AC inverter has been used which is useful in reducing the harmonics in the output of the Inverter. The voltage controlled output is produced in the boost inverter the current controlled output is taken from dc?dc bidirectional converter. The Fuel cell cannot be relied as a whole so a Solar PV module is connected across the Load so while the Sunlight days the PV arrays generate power and in the night time the Fuel cell is used to generate power for the load. Since, the Fuel cell and PV arrays can generate power in Partial load they are preferred than any other sources. When the output from the Solar PV array is low or when the sunlight available is not efficient in generating the power a automatic switch over is provided in the junction between the Solar PV array and Fuel cell so that whenever it happens the switch automatically switch over to another source. The simulation results are presented to confirm the operational feature of the proposed system.