A Three-Phase Frequency-Fixed DSOGI-PLL With Low Computational Effort

This paper offers a detailed analysis as well tuning and discretization approach of the presented frequency-fixed dual second order generalized integrator based phase-locked loop (FFDSOGI-PLL) for three-phase power systems. The method combines different single- PLL approaches by ensuring high phase- frequency tracking properties. comparison with standard frequency-variable DSOGI-PLL three recently published phase-angle estimation systems shows, that this gives fast stable phase detection grid voltage very low computational burden. results are applicable to, instance, photovoltaic or converters active filters.