A DC model for transient analysis of a series active filter integrated with a double-series diode rectifier

This paper deals with transient analysis of a series active filter integrated with a double-series diode rectifier. A dc model is developed with the help of the p-q coordinates transformation. It can be used to accurately and simply analyze transient characteristics around the fundamental frequency of the integrated system. The analysis using the dc model tells us that either increasing the active filter gain or decreasing the cut-off frequency of low-pass filters used in the harmonic detector results in a slow response, and causes a large and long transient of the dc voltage. Simulation results using a software package 'EMTDC' and experimental results verify the validity of the proposed dc model. Index Terms--DC mode, diode rectifiers, power converters, series active filters, transient analysis.