Abstract
Shunt Active Power Filter (SAPF) can be used for compensation of current harmonics generated by non-linear loads. The process involves an injection of equal but opposite current to mitigate the distortion current supplied back by nonlinear load to the voltage supply. Thus, the injected current will shape the supply current to a sinusoidal. SAPF consists of signal processing part and injection part. Processing part generates reference current wave and the injection part injects the reference current parallel to the load. In this paper a comparison is made between three different control strategies for current injection in three-phase three-wire shunt active power filter. The current injection is performed by generating gate pulses pattern for the voltage source inverter using a suitable controller. In this paper three control techniques are compared including Hysteresis Current Control (HCC), Delta Modulation Control (DMC) and One Cycle Control (OCC). The performance of these techniques is evaluated by the accuracy of the injected current in parallel to the load by comparing the required current to be injected and the measured value of the injected current. The performance is also evaluated by measuring Total Harmonic Distortion (THD) of the source current before and after compensation. The results are evaluated and compared using Matlab/Simulink.
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