Active power filters synchronisation in networks with large frequency deviation

Abstract

This paper presents a new method for real time calculation of the current reference in Active Power line Con- ditioners (APLC), splitting up the fundamental and the distor- tion components. Amplitude and phase of fundamental com- ponent are obtained separately, which allows a separate com- pensation of fundamental lagging current and harmonic cur- rents. The method is based on a sinus-cosinus correlation to obtain the phase of fundamental component. The main advan- tages of such method are: the fast response to transient changes, the null sensitivity to frequency variations and the low processor resources employed. Simulated and experimen- tal results are presented in order to show the features of the method in several transient situations.