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This paper proposes a method to obtain the reference currents of a shunt active power compensator based on the non-active 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, unbalances and distortion, and with voltages, including asymmetries and harmonic components. The electric quality is improved with the use of the proposed selective control. Index Terms--Electrical quality, harmonic compensation, IEEE Standard 1459, reactive compensation, shunt active power compensators, unbalanced three-phase four-wire systems.

IEEE Standard 1459-2000 establishes that in an efficient electrical system, only the fundamental positive-sequence active power must be present. This paper proposes a new set of reference currents based on the IEEE Standard 1459-2000 for the control of a three-branch four-wire shunt active power compensator. Reactive, unbalance, and harmonic distortion phenomena can be cancelled out upstream from the point of connection, achieving maximum efficiency of the three-phase four-wire electrical system. In addition, a new current control and a three-dimensional space vector pulsewidth-modulation technique are proposed to develop a shunt active power compensator. Simulation and experimental results demonstrate that the proposed shunt active power compensator improves the upstream electrical quality of the power network, achieving maximum efficiency according to IEEE Standard 1459-2000 specifications. Index Terms--Active filters, active power compensators (APCs), current control, harmonic distortion, IEEE standards, power quality (PQ), pulsewidth modulation, reactive power.