Variation power, variation currents: Physical background and compensation rules

Abstract

AbstractDerived from instantaneous power and average power the instantaneous power currents as well as the instantaneous active currents are clearly defined under steady state conditions. As a consequence instantaneous active power is also defined without any ambiguity. It is shown that if there is any difference between instantaneous power and instantaneous active power the apparent power becomes larger than the absolute value of the active power. Furthermore the rules are derived whether a power oscillation should be compensated or not and what energy storage capability of the compensator is then necessary.