The conventional reactive power has been defined on the basis of the average value concept for sinusoidal voltage and current waveforms in steady states.
Thus, the conventional reactive power compensators can compensate only the fundamental reactive power in steady states and have a slow response time.
But on this thesis, the instantaneous imaginary power, which is a new electrical quantity, is introduced. By using the instantaneous imaginary power, the proposed compensator can compensate not only the fundamental component in transient states but also harmonic currents for arbitrary voltage and current waveforms.
