A NEW TOPOLOGY OF MULTIPORT ASYMMETRIC SEVEN LEVEL INVERTER USING FUZZY LOGIC CONTROLLER

ELECTRICAL AND ELECTRONICS ENGINEERING

In recent years, multilevel inverters have become more attractive for researchers and manufacturers due to their advantages over conventional three-level Pulse Width-modulated (PWM) inverters. They offer improved output waveforms, smaller filter size, lower Electromagenetic Interference(EMI),lower Total Harmonic Distortion (THD) and others. In this Project, switched-capacitor multilevel inverter with fuzzy logic control is proposed. The proposed cascaded multilevel inverter work with asymmetric DC voltage sources and needs lower number of power semiconductor switches hence the complexity and the cost of the overall system decreases. Pulses for the switches are generated by using fuzzy rule based pulse width modulation. Procedure to generate voltage levels is developed. The inverter inherently solves the problem of capacitor voltage balancing as each capacitor is charged to the value equal to one of input voltage every cycle. The rules of the FLC will control the amplitude of the PWM sine wave with respect to the error voltage. The seven level MLIs offers improved performance with FLC when compare with conventional inverters .

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