Influence of PLL on Stability of Interconnected Grid-Forming and Grid-Following Converters
Yang Wu, Heng Wu, Fangzhou Zhao, Zejie Li, Xiongfei Wang
Abstract
This letter analyzes the impact of a phase-locked loop (PLL) on small-signal stability in a system of interconnected grid-forming and grid-following (GFL) converters. It identifies an undiscovered instability phenomenon, i.e., the system is prone to unstable when the bandwidth of PLL used with GFL converter is low. Experiments validate the theoretical analysis.
Topics & Concepts
ConvertersPhase-locked loopGridStability (learning theory)Electronic engineeringControl theory (sociology)PLL multibitComputer scienceEngineeringElectrical engineeringVoltageMathematicsJitterControl (management)Artificial intelligenceGeometryMachine learningMicrogrid Control and OptimizationIslanding Detection in Power SystemsHVDC Systems and Fault Protection