Adaptive Active Power Line Harmonic Filter for Industrial and Commercial Power Distribution Systems

Harmonic disturbances caused by non-linear loads such as power switching devices often occur in the industrial and commercial power distribution systems and can damage sensitive equipment connected to the systems, causing tremendous productivity loss. This paper presents an adaptive-harmonic detection-algorithm (AHDA) active filter for effective elimination of harmonic disturbances. This filter consists of a standard power electronic inverter with state-of-the-art digital signal processor (DSP) control. The AHDA filter is efficient due to its adaptive harmonic detection algorithm for various powerline conditions. The algorithm is based on a novel noise cancellation theory that was designed for applications outside power electronics. This paper presents a practical formulation of the algorithm to significantly simplify the original complex formulation for noise cancellations. This paper details the DSP-based hardware and software implementations of the AHDA filter. This filter achieved high operational reliability and cost effectiveness. Simulation and experimental results are provided