Design and optimisation of a simple filter group for reactive power distribution

Abstract

Basic methods are presented to design a simple filter group and a method of shaping the resultant of the filter group's impedance characteristics (distribution of the characteristics' extremes) and then project equations were transformed into a uniform, common form that addresses issues of the reactive power distribution between component filters. The analysis also takes into account the filters' detuning from the reduced harmonics and quality factors of passive elements. Another important factor of the analysis considered was the power grid equivalent impedance affecting the filtration effectiveness. A criterion for the filter group's filtration effectiveness evaluation was proposed and optimisation was completed for the reactive power distribution between separate filters in the function of the power grid's equivalent inductance.