PHASE LOCK LOOP WITH CASCADE TRACKING FILTERS FOR SYNCHRONIZING AN ELECTRIC GRID

摘要

Present embodiments relate to a method for synchronizing an electric grid. The method includes receiving a phase voltage of the electric grid. The method further includes determining one or more disturbance frequencies in the phase voltage via a plurality of sequential tracking filters, wherein each of the plurality of tracking filters corresponds to a harmonic of the received phase voltage. The method further includes removing the disturbance frequencies components sequentially to produce a minimally distorted frequency, and performing a PLL operation on the clean frequency to determine a phase angle of the frequency.

主权项

1. A method for synchronizing an electric power source, comprising:
receiving a phase voltage of an electric power source; determining one or more disturbance frequencies in the phase voltage via a plurality of sequential tracking filters, wherein each of the plurality of tracking filters corresponds to a harmonic of the received phase voltage; removing each disturbance frequency sequentially within a phase-locked loop (PLL) to produce a clean frequency; and performing a PLL operation on the clean frequency to determine a phase angle of the frequency.