Power conditioners synchronisation in networks with large frequency deviation

This paper presents a new method for real time calculation of the current reference in active power line conditioners (APLC), splitting up the fundamental and the distortion components. Amplitude and phase of fundamental component are obtained separately, which allows a separate compensation of fundamental lagging current and harmonic currents. The method is based on a sinus-cosinus correlation to obtain the phase of fundamental component. The main advantages of such method are: the fast response to transient changes, the null sensitivity to frequency variations and the low processor resources employed. Simulated and experimental results are presented in order to show the features of the method in several transient situations.