Shunt Active Harmonic Filter for Connected On-Board EV Charger Loads Harmonic Mitigation

An electrical power system with connected electric vehicle (EV) on-board charger loads will produce harmonic current which affects the power quality of the system. To mitigate the harmonic current, shunt-type active harmonic filter (SAHF) has been configured and implemented at the low voltage (LV) line. The SAHF control strategy applied is named reference current compensation control which consists of only two core elements. The elements are reference current generation and current control and gate signal generation. The control strategy has the benefit of simple topology, low mathematical complexity, and fast response time. Simulation for SAHF implementation in electrical power system with connected EV on-board charger loads is conducted via MATLAB/Simulink. The harmonic current mitigation result has shown that $TDD_{i}, 5^{th}$ order IHD$_{i}, 7^{th}$ order IHD$_{i}, 11^{th}$ order IHD$_{i}, 13^{th}$ order IHDi and 17^th order IHDi levels are 4.66 %, 2.37 %, 1.82 %, 0.75 %, 0.31 % and 0.26 % respectively which comply with IEEE std. 519-2014 recommended limits thereby verifying the effectiveness of the proposed SAHF.

I. Introduction

Harmonics-related power quality issues has been documented ever since the advent of AC power system. However, the issue was not significant as most of the grid-connected load are linear load which does not generate harmonics. As industries started to utilize more high-power power electronics after their introduction, harmonics gradually posed a threat to the integrity of the grid. Loads and devices with power electronics are generally classified as nonlinear loads. Especially in modern times, power electronics are widely used in various industries and applications as drives and converters.