Abstract
The synchronization instability is one of the serious problems for grid-following converter (GFL). Real-time identification of AC grid impedance enables improves the application of adaptive current injection synchronous stabilization control method in practical power systems. In this paper, a Thevenin equivalent (TE) impedance identification method using Fast Fourier Transform (FFT) analysis is proposed and applied to GFL synchronous stability control. First, according to the analysis of the static and dynamic instability mechanism of phase-locked loop (PLL), the necessity of impedance identification is explained. Then, using FFT analysis, the TE impedance of the AC system is calculated in real-time. Finally, the estimated TE parameters are used to determine the current references of GFL during the fault to ensure that no loss of synchronization (LOS) occurs in the GFL. The simulation results show that the proposed identification method can quickly track the AC grid impedance changes of system after a fault, and can be used in the adaptive current control strategy.
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