Harmonic Mitigation of Residential Distribution System using a Novel Hybrid Active Power Filter

This paper proposes an LCL-filter-based hybrid active power filter for harmonic mitigation of a 10/0.4kV residential distribution system. By using C-LCL-filter based topology, better switching ripples attenuation is achieved, and the phase margin of the power stage at higher frequency is significantly improved. Adaptive linear neural network (ADALINE) is applied for individual harmonic component extraction and the estimated signals are used for selective harmonic elimination (SHE) purposes. A robust deadbeat current control law is derived based on the low frequency model of the presented topology. Owing to the ADALINE based SHE strategy, the controller bandwidth requirement is noticeably diminished thus the stability of whole system is ensured. The feasibility and effectiveness of the proposed system have been substantially confirmed by the laboratory experiments and field tests.