PI and FUZZY Controller based DVR to mitigate power quality and reduce the harmonics distortion of sensitive load

Abstract

power quality has been an issue that is becoming incresingly pivotal in modern industrial and commercialapplications. voltage disturbances especially the voltage sag and swell are the most common power quality problems due to increased use of a large number of sophisticated and sensitive electronic equipment in industrial systems. to overcome this problem, custom power devices are used. one of the devices is DVR, which is the most efficient and effective modern custom power device used in power distribution networks. it is series connected power electronic based device that can quickly mitigate the voltage sag in the system and restore the load voltage to the pre fault value. the primary advantage of the DVR is keeping the users always online with high quality constant voltage maintaining the continuity of production. in this dissertation, a PI and FUZZY logic contoller methods for DVR that protects a sensitive load, to counter voltage sag under unbalanced loading condtions is presented. DVR along with other parts of the distribution system are simulated using MATLAB/Simulink.