INVESTIGATION OF PERFORMANCE ANALYSIS OF PV FED MULTILEVEL INVERTER FOR WATER PUMPING APPLICATIONS

Tiruchirappalli-620 024. ABSTRACT: Inthis paper, the proposed work is to extract maximum power from the PV powered water pumping system driven induction motor. The PV powered water pumping is commonly used for agriculture and households applications. To seek out the peak power from the PV array, the inverter is operated at variable frequency, to vary the output of the water pump. The proposed system utilizes the multilevel inverter to generate a sinusoidal waveform instead of quasi square wave inverter. The anticipated system has the benefits of less Total Harmonic Distortion in the output voltage, low switching losses, less in filter requirements, low heating of motor under rating condition, less in ripple torque production and so on. The fuzzy logic based peak power point tracking technique is employed. The extraction of peak power is achieved by varying the frequency of multilevel inverter in order to operate theinduction motor at maximum torque condition. The additional features of the PV fed system is that, the motor current is limited to an upper limit of PV array current, so that motor winding and power semi conducting switches can be protected against excessive current flow. The system is tested using MATLAB/ simulinkforenvironmentunder different condition like, change in insolation and change in temperature for the validation of the proposed work.