Comparison of Various Voltage Control Techniques for Voltage Source Inverter

Abstract

This project work deals with design and comparison of different voltage control techniques for three phase voltage source inverter feeding RL load. Two control techniques namely PI controller and Fuzzy logic controller has been presented in this project work. Initially the simulation of three phase inverter using sine PWM technique feeding RL load using MATLAB/Simulink has been presented. Further, design of LC filter has been done since the output of inverter is sine wave. In order to justify the comparison of controllers another parallel RL load is added such that it acts at some other time instant. Then design of PI controller with load side disturbance is simulated and presented. The Fuzzy logic controller rules obtained from input output mapping has been presented. In Fuzzy logic controller input depends on error and change in error with linguistic variable while output depends upon change in switching voltage of VSI. Then design of Fuzzy logic controller with load side disturbance is also simulated. Finally comparison of fuzzy controller with PI controller based on steady state error reduction has been discussed.