Instantaneous Reactive Power Theory


This chapter presents the fundamentals of the instantaneous reactive power theory for three-phase three/four-wire systems. The original formulation presents a description model of three-phase systems through the introduction of two power variables: the instantaneous real power and instantaneous imaginary power. The initial objective of the formulation was to serve as a basis for designing static compensators (active power filters) without energy storage elements. Following this, alternative formulations have been proposed, although they all have a clear nexus of inspiration in the original formulation. Here the basics of instantaneous reactive power theory are presented, as well as those derived ...

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