A hybrid structure of series active and passive filters to achieving power quality criteria

This paper presents a series combination of active and passive filters and discuss the appropriate control strategy for removing harmonics caused by nonlinear loads. The system consists of a small-rated series active power filter (SRSAPF) and a series tuned passive filter. This combination is suitable for compensating voltage type harmonics-producing load, whereas the hybrid control approach adopted is based on detecting both source current and load voltage harmonics. This technique enhances the compensation characteristics of the proposed system. Simulation results using Power System Blockset Toolbox PSB of Matlab show the performance of the hybrid filter, controlled by the hybrid approach, and its capability to compensate for voltage type harmonics-producing load.