Removal of Harmonics in Distribution System by Shunt Active Filter

As most of the loads connected to distribution system such as house hold equipment, small scale industries etc are non linear loads and consists of power electronic converters which produces harmonics which causes injection of harmonics in the supply system and causes serious power quality issues. On the other hand inductive loads demand reactive power. The active power filter has been proved to be an effective method to mitigate harmonic currents generated by nonlinear loads and to compensate reactive power present in the system. The active power filters for harmonic current compensation do not show significant results for harmonic voltage problems and filters for harmonic voltage compensation do not provide reliable solution for harmonic current problems. It also have a drawback of poor performance in case of low frequency application. Hence the methods of harmonic current detection play a crucial part in the performance of active power filter (APF). This paper presents a new control strategy in which shunt active power filter configuration is developed using adaptive fuzzy control in order to define simple control algorithm which requires minimum number of current measurements. The effectiveness of the proposed control strategies are demonstrated through results. The proposed systems are implemented with MATLAB/SIMULINK software.