IMPROVEMENT OF THD USING F UZZY L OGI C BASED PWM MODULATION TECHNIQUE IN MATRIX CONVERTER FED AC DRIVES

This paper presents Fuzzy logic based control of matrix converters for AC drives. Matrix Converters can directly convert ac power supply of fixed voltage into ac voltage of variable amplitude and frequency. Matrix Converter is a single stage converter. The matrix converters can contribute to the realization of low volume, sinusoidal input current, bidirectional power flow and lack of bulky reactive elements. All th is reasons lead to the development of matrix converter. Based on the control techniques used in the matrix converter, the performance varies. In this paper the performance of matrix converter with PWM modulation technique with using FLC and without using FLC is analyzed . The basic principle and switching sequence of this modulation technique is also presented in this paper. The output voltage, output current waveforms and THD spectrum of switching waveforms connected to RL load are analyzed by using Matlab/Si mulink software. The simulated results shows that the THD is better for PWM technique using FLC