Active power filters for harmonic mitigation in power systems

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University of New Brunswick


The use of power electronics in all types of industrial, commercial, and residential loads can cause system-wide reduction of the power quality from harmonic distortion of the AC waveform. Residential non-linear loads resulting from heavily used power electronic devices and renewable energy sources at the distribution power system level can significantly contribute to harmonic distortion. With excessive harmonic distortion, traditional mitigation methods such as using passive filtering has had limited success. As such, this thesis aims to utilize active power filters to improve the distribution power quality affected by unwanted harmonic components. Various time and frequency domain harmonic detections methods are proposed and implemented in a shunt configuration topology. The goal is to assess active filtering techniques based on previously published research with novel modifications to improve performance based on harmonic reduction and convergence speed (settling time) in time-varying conditions.