1. Synchronization Stability of Grid-Following Converters Governed by Saturation Nonlinearities.
- Author
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Wu, Tianhao, Jiang, Qirong, Huang, Meng, and Xie, Xiaorong
- Subjects
SYNCHRONIZATION ,CURRENT limiters ,IDEAL sources (Electric circuits) ,VOLTAGE-frequency converters ,PHASE-locked loops ,ELECTRIC transients - Abstract
Saturation nonlinearities caused by control limiters will be activated during large disturbances, complicating the stability of grid-tied voltage source converters (VSCs). This letter investigates the large-disturbance synchronization stability of the grid-tied VSC considering two typical control limiters, i.e., the hard limiter of the reference current and the circular limiter used to avoid overmodulation. A unified differential equation (UDE) model is proposed to quantify the transient responses and stability boundaries of the system under different saturation conditions. It is revealed that the VSC behaves as a current source when the hard limiter is activated; while the interaction between the two limiters drives the VSC to work as a voltage source, making it immune to synchronization instability. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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