Impact of PLL Frequency Limiter on Synchronization Stability of Grid Feeding Converter
Junru Chen, Muyang Liu, Hua Geng, Terence O’Donnell, Federico Milano
Abstract
It is well known that grid-feeding converters that synchronize to the grid through a Phase-Locked Loop (PLL) can become unstable after a fault. An often-neglected element that plays an important role in the converter synchronization stability is the PLL frequency limiter. While it slows down the phase change during the fault, the frequency limiter also constrains the error of the PLL input, thus leading to a longer settling time. This letter investigates the mechanism of the converter synchronization stability caused by the frequency limiter and provides a taxonomy to evaluate its impact on the overall system dynamic response.
Topics & Concepts
Phase-locked loopLimiterControl theory (sociology)ConvertersSynchronization (alternating current)Settling timeGridFault current limiterFault (geology)Computer scienceElectronic engineeringEngineeringVoltageElectric power systemControl engineeringPhysicsTopology (electrical circuits)Electrical engineeringTelecommunicationsMathematicsPower (physics)Step responseGeometryGeologyArtificial intelligenceJitterQuantum mechanicsSeismologyControl (management)Microgrid Control and OptimizationIslanding Detection in Power SystemsPower Systems and Renewable Energy