This paper introduces design and simulation of a low cost shunt active power filter, which allows dynamic power factor correction and harmonic compensation for a nonlinear load. One of the most important features of the shunt active filter system proposed is its versatility over a variety of different conditions. The active filter controller is based on the Instantaneous power theory (p-q theory), which monitors the load current and injects equal amplitude and opposite phase compensation currents to neutralise load current harmonics. The application of the positive sequence voltage detector from within the active filter controller is the key component of the system. The positive sequence voltage detector gives incredible versatility to the application of the active filter, because it can be installed and compensate for load current harmonics even when the input voltage is highly distorted and unbalanced. The controller algorithm is carried out using MATLAB Simulink.
Shunt Active Filter, p-q theory, Power Factor Correction, Clarke transformation and Power Quality
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