Cascading Synchronization Instability in Multi-VSC Grid-Connected System
Xikun Fu, Meng Huang, Shangzhi Pan, Xiaoming Zha
Abstract
In this letter, a cascading synchronization instability phenomenon is reported in a multi-voltage-source-converter (VSC) grid. By adopting the equal area criterion, it is revealed that during the fault transient, there is static interaction that increases equivalent mechanical power for the original stable-operating VSC. Due to the fast power angle swing of the unstable VSC, there is nonnegligible dynamic interaction, which may decrease its synchronization stability margin. The effect of system parameters on synchronization stability is studied, and the simulation and experimental results verify the analysis.
Topics & Concepts
Control theory (sociology)Synchronization (alternating current)SwingInstabilityTransient (computer programming)GridElectric power systemVoltage sourcePower (physics)Fault (geology)Margin (machine learning)Power gridComputer scienceVoltageEngineeringTopology (electrical circuits)PhysicsMathematicsMechanicsElectrical engineeringArtificial intelligenceControl (management)Operating systemGeometryMechanical engineeringMachine learningGeologySeismologyQuantum mechanicsMicrogrid Control and OptimizationIslanding Detection in Power SystemsPower Systems and Renewable Energy