Comparison of Various Voltage Control Techniques for Voltage Source Inverter
Keywords:
Proportional Integral(PI), Fuzzy Logic Controller(FLC), Voltage Source Inverter(VSI)’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.
