Physical interpretation of electric energy flow under sinusoidal and non-sinusoidal conditions

摘要

This paper introduces an analytical derivation to evaluate the flow of electric energy in power networks. This derivation is based on the paper “New Notions Suggested to power theory development - part 1: analytical derivation” published in IEEE/PES general meeting 2008. It is proven that the true energy that totally transfers to (or from) the system is the energy which belongs to the average true power only i.e. active power produced from voltage and current of the same harmonic order. All other kinds of energy are fluctuating sinusoidaly and the net transferred energy belongs to these sinusoidal power components is nil. It is a theoretical attempt to prove that the new definitions of power components suggested in paper mentioned above are connected with their associated energies and to find the physical essence of the power components under sinusoidal and non-sinusoidal conditions.