Application of self tuning filter for power quality improvement in three-phase-three-wire distorted grid system

In this paper an application of Self Tuning Filter (STF) for power quality (PQ) improvement using shunt active power filter (SAPF) is discussed. In weak distribution system, due to presence of non-linear loads in the vicinity, the supply voltage also gets distorted. So mitigating PQ issues in such systems is a challenging task. The simulation model of STF technique is developed in MATLAB/SIMULINK environment. Extensive simulation results are presented to show the effectiveness of the proposed technique. The control algorithm results in supply currents THD maintained under the limit as specified by IEEE 519. Moreover STF is is discussed in the paper to extract all the harmonics from the load current and fundamental component of grid voltages for proper synchronization of SAPF.