HUANG Changlin,ZHANG Junbo,ZHENG Waisheng,et al.Analysis and Control of Coupling Between Transient Synchronization and Overvoltage Under Mode Switching of Grid-forming Converters[J].Automation of Electric Power Systems,2026,50(4):173-185.
HUANG Changlin,ZHANG Junbo,ZHENG Waisheng,et al.Analysis and Control of Coupling Between Transient Synchronization and Overvoltage Under Mode Switching of Grid-forming Converters[J].Automation of Electric Power Systems,2026,50(4):173-185. DOI: 10.7500/AEPS20241030007.
Analysis and Control of Coupling Between Transient Synchronization and Overvoltage Under Mode Switching of Grid-forming Converters
the grid-forming converter (GFM) will switch from the voltage source mode to the current limiting mode
which poses a risk of being unable to exit the current limiting mode after the disturbance is cleared and experiencing power-frequency overvoltage during the recovery period. Currently
research on the transient synchronization and power-frequency overvoltage coupling stability mechanisms of GFM is still insufficient. Therefore
first
by using power characteristic curves combined with the phasor method
the phase angle evolution and voltage boundary violation of the GFM operating point after a large disturbance are analyzed. A mode switching rule based on the output phase angle of the GFM is proposed. On this basis
the transient recovery process of the GFM is further investigated
and a power-frequency overvoltage criterion during the recovery period is analytically derived. Then
based on the mode switching rule and the power-frequency overvoltage criterion
the concept of the optimal fault-clearing phase interval is proposed
which balances synchronization stability and overvoltage limitation. Finally
an improved strategy considering both transient synchronization and power-frequency overvoltage coupling stability is proposed
and its effectiveness is verified through PSCAD/EMTDC simulation.
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