Three-Phase Four-Wire Hybrid Active Power Filter for Mitigating Harmonic Problems Caused by CFLs Lamps based on a Shunt Active Power Filter SAPF in Parallel with a Passive Filter

The widespread integration of nonlinear loads across industrial, commercial, and residential settings has significantly exacerbated power quality issues within contemporary power distribution systems. An example of such nonlinear loads is the prevalent use of compact fluorescent lamps (CFLs), intended as replacements for incandescent lamps (ILs). CFLs have gained popularity owing to their reduced energy consumption and extended lifespan, contributing to their extensive use across various applications. But those lamps inject high harmonic current in the power system. To address this issue, a hybrid active power filter HAPF based on a shunt active power filter SAPF in parallel with a passive filter (PF) is implemented in this paper. The reference current is calculated based on the PQ theory, and the voltage source inverter VSI is controlled via a simple hysteresis current controller (HCC). The results show that the PF is suitable to compensate for the Hight harmonic generated by both the load and the switched device of the APF. Also, this HAPF is well designed and implemented to mitigate all harmonic generated by CFL lamps on the power system, and compensate the reactive power. The THD of the current is reduced from 90.75% before compensation to 0.75% after compensation. This implies that the main injects only the Fundamental current to the power.