Description

This project proposes a new low cost converter- inverter drive system for induction motor. The converter is designed to drive a three-phase induction motor directly from PhotoVoltaic (PV) energy source. The three phase induction motor is better because of its low cost, reliability, no maintenance, high efficiency and good power factor. Two Inductor Boost Converter (TIBC) is used in first stage along with the voltage doubler rectifier and snubber to develop the system. The reason to choose TIBC is due to its high voltage gain and low input current ripple, which minimizes the oscillations at the module operation point. To convert the boosted DC output voltage from PV module into AC, a voltage source inverter is implemented to attain sufficient voltage to drive the motor. As the PV cell posses the nonlinear behaviour, the Maximum Power Point Tracker (MPPT) controller is needed to improve the utilization efficiency of the converter. The MPPT algorithm proposed in this paper based on hill climbing algorithm, for matching the load and to boost the PV module output voltage. PI Controller is used to control the speed of the Induction Motor. The entire system is simulated using Matlab Simulink environment. The system is expected to be operated with high efficiency and low cost for long lifetime.

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