Adaline controlled 3-phase 3-wire shunt active power filter with enhanced performance using the capacitor voltage feedback

This paper presents a fast technique to generate the current reference to compensate for the harmonics and reactive power in a shunt type active power filter (APF). A voltage source inverter (VSI) is operated in the current controlled mode for this purpose. For fast generation of the reference current in the APF, the DC link voltage of the VSI is always sensed and an initial estimate is derived through an ANN based PI controller. It has been observed that this method works fine for balanced load. Unbalance in load and also uncertainty/mismatch in the filter parameters, deteriorate the system performance. To overcome this drawback, an Adaline based technique is incorporated. Weights in Adaline are tuned to minimize the total harmonic distortion (THD) of the source current. Extensive simulations confirm the validity of the proposed scheme for all kinds of load (balanced and unbalanced) for a three phase three wire.