Selective Shunt Active Power Compensator Applied in Four-Wire Electrical Systems Based on IEEE Std. 1459

This paper proposes a method to obtain the reference currents of a shunt active power compensator based on the nonactive power magnitudes defined in IEEE Standard 1459-2000. These reference currents are used to control a shunt active power compensator that features new selective compensating capabilities. Fundamental positive-sequence reactive power, unbalance power, and nonfundamental effective apparent power present in electric systems can be cancelled individually or combined with each other. Experimental results are obtained using a three-branch four-wire shunt active compensator. These results demonstrate that the proposed selective compensator works well in three-phase electrical systems with load currents, including phase shifts, unbalance,s and distortion, and with voltages, including asymmetries and harmonic components. The electric quality is improved with the use of the proposed selective control.