Mitigation of Harmonics by Fuzzy logic controlled Series Compensator

In this paper, series compensator is proposed to reduce the harmonic distortion in the sensitive load due to the presence of non linear loads in the power system network. The series compensation method is best suited to protect such load against this disturbance. The use of a series compensator (SC) to improve power quality is an isolated power system is investigated. In this paper, a series compensator is proposed and a method of harmonic compensation is described using PI controller and Fuzzy controller. The proposed series compensator consists of Energy Storage System (ESS) and Voltage Source Inverter (VSI), Injection Transformer. The ESS can be a capacitor of suitable capacity. ESS would act as a buffer. Injection Transformer is used to inject the voltage in transmission line in appropriate level. In this way the terminal voltage of the protected sensitive load can be regulated to maintain a constant level. The modeling and simulation of the proposed series compensator was implemented in Matlab Simulink work space. Simulation results showed that the proposed series compensator was efficient in mitigating harmonics and compare with the both controllers and thus improve the power quality of the isolated power system. This approach is different from conventional methods and provides effective solution. If this method is enhanced in future it could provide much more improved power quality.