Performance of grid-voltage synchronization algorithms based on frequency-and phase-locked loop during severe grid fault conditions

摘要

Since the beginning of twenty first century, Renewable energy resources have been developing into the fuel of choice to handle the upcoming electricity demand around the world. To implement the renewable energy resources, Microgrid-a localized group of electricity sources and loads-is considered as the most suitable option to shift over the conventional utility grid due to a number of advantages. In case of grid-tied microgrid application, the voltage synchronization is required to experience desirable performance. This paper evaluates the performance of two leading comprehensive synchronization algorithm, Decoupled Double Synchronous Reference Frame PLL (DDSRF-PLL) and Double Second-order Generalized Integrator FLL (DSOGI-FLL) under adverse grid fault conditions. Results show that their performance does not obey modern grid codes during the harmonic-polluted situation. An advanced algorithm, decoupled multiple Synchronous Reference Frame PLL (DMSRF-PLL) build on SRF-PLL, might exhibit accurate performance when the utility voltage contains harmonic distortion.