Low voltage ride-through strategy for a grid-forming converter with 3 times current overload based on adaptive virtual impedance

IntroductionDuring three-phase faults in power grids, existing low-voltage ride-through (LVRT) strategies are often constrained by the current withstand capability of converters, resulting in insufficient voltage support. In addition, the widely used virtual impedance method involves complex calculations and difficult parameter selection under complex grid conditions.MethodsTo address these issues, this paper proposes a grid-forming adaptive virtual impedance LVRT strategy that matches the 3-tim