Transient Response Improvement & Harmonic mitigation by Shunt Active Filter in Power System

Harmonics can be a major issue of concern as it can cause excessive heating and torque reduction in motors and generators, voltage stress may be increased in capacitors as well as heating effect and can cause misleading in operation of electronics based instruments or relaying commands. The conclusion is the harmonics can reduce the life of the equipment’s and overall system. So a system should be properly designed considering the harmful effects of harmonics in the system.This work focuses on harmonic mitigation in power systems using a shunt active power filter (SAPF) to reduce harmonics within permissible limits. Nonlinear loads are the primary sources of harmonics, leading to power quality issues such as voltage sag, swell, flicker, and waveform distortion. To address these challenges, a SAPF is integrated into the modelled power system, and its performance is evaluated. The effectiveness of the SAPF largely depends on the employed control strategy, which plays a critical role in harmonic suppression. In this study, hysteresis current control and phase control methods are implemented as reference techniques for harmonic reduction. The complete system is modelled and simulated in MATLAB/Simulink to analyse performance and validate results.