Instantaneous power components in polyphase systems under nonsinusoidal conditions

A generalised theory of electric power for polyphase systems has been developed which is based on the concepts of instantaneous real power and instantaneous imaginary power. The line current vector is decomposed into two orthogonal components, without need of appealing to match a mathematical transformation of the phase components. Each current component is physically associated with a term of different instantaneous power. The proposed theory permits both identifying defined current/power components in three-phase circuits, and setting the bases of the use of instantaneous reactive power compensation via an active power filter without energy storage circuits. Simulation of a practical case shows results that confirm the proposed theory