Energy efficiency criterion of Power Active Filter in a three-phase network

The result of research is analysis of energy-saving effect from the application of the parallel active power filter (APF) on electric grid with considering static and dynamic power losses of APF are presented. By polynomial approximation of energy characteristics of power switches, the determination of own power losses in APF is performed. Analytical dependencies of additional power losses in the electrical network resistance on higher current harmonics, namely on total harmonic distortion of the current are presented. Taking into account own power losses in the APF, based on compensation of grid current harmonics the total energy-saving effect is given. It shown that in some cases (when the resistance of the network is small) using the APF reduces network power efficiency. Also, it is shown that the active power filter can serve as a source of voltage distortion in the electrical network at the connection point, which requires the use of additional passive or hybrid filters.