Harmonics Reduction Using ANN-Based Hybrid Active Filter for Power Quality Improvement

The rapid proliferation of power electronics-based nonlinear loads has made power quality a significant concern in a distribution network. Harmonic distortion affects equipment performance and increases system losses. Passive, active, and hybrid filters are three approaches to mitigating harmonics. This study describes the application of a hybrid filter to reduce harmonics within IEEE-519 limits by utilizing both passive and active filters. The hybrid filter is a shunt combination of a power electronics-based active filter and a passive filter. In high-power applications, passive filters reduce low-order high-amplitude harmonics, and high-order using active filters hence reduce the active filter rating and cost. To estimate the reference signal for the shunt active filter, the P–Q theory is used. Control of switching signals for the voltage source inverter is achieved by utilizing a hysteresis current control loop. In this work, the concept of ANN is applied for active filter control. The ANN controller replaces the conventional PI controller to control the DC voltage of the active filter. The performance of the system utilizing different harmonic compensation approaches is observed in terms of harmonic distortion index as per IEEE standards. System performance under static and varying load circumstances has been monitored using MATLAB/SIMULINK.