Estimation of energetic factors in power electronics supply systems

Conventional calculation methods of electric power and its components as orthogonal, integral, symbolic, systems equivalence, etc., applied to nonsinusoidal system analysis bring different and sometimes inexplicable results. Obtained in such a way, reactive and apparent power have no physical interpretation and have only an arbitrary mathematical implication. Therefore, currently accepted definitions of electric power components are reviewed and their limitations in systems with power converters are analyzed. In terms of instantaneous power, a number of energy flow and power components such as active, external, input, reverse, resonant, storage, oscillation, etc., have been determined. These components can be used to determine new energetic factors: the system energy utilization factor, consumer energy utilization factor, power oscillation factor, etc. They may be applied for power system optimization, reactive and active power compensation, and harmonic suppression. The application of the theory developed is illustrated by a typical example. The proposed power and energy components can be directly measured by means of digital electronic instruments