The switching frequency based active power as highly dynamic approximation of conventional active power calculation

In this contribution, the switching frequency based active power will be presented as a new power definition. It combines the information of the instantaneous power, as product of voltage and current, and the conventional active power representing the mean value of the instantaneous power over the fundamental period. Under several theoretical conditions the switching frequency based active power is absolutely equal to the well-known active power definition. In practical applications it approximates the active power but with the advantage of consideration of highly dynamic load changes and transients in voltages and currents. Because of this aspect, it is very useful for real time applications, especially for active power control.