To solve the problems that the quantitative evaluation for synchronous stability of the grid following converter was usually simulated by grid voltage sag faults,but the variation in the grid equivalent impedance caused by short circuit faults was not considered,a quantitative evaluation method for synchronous stability of the grid following converter based on real-time impedance identification was proposed.The significance of grid equivalent impedance on system stability was demonstrated using an established model for synchronous stability analysis of the grid connected system with a grid following converter.To account for variations in the grid equivalent impedance during fault conditions,a real-time impedance identification method was employed to quickly and accurately identify it.The identified impedance was then utilized to construct a Lyapunov function for quantitatively evaluating synchronous stability.Simulation analysis using MATLAB/Simulink was conducted to evaluate the synchronous stability of the grid following converter under short circuit faults,confirming both the correctness and effectiveness of the proposed method.
grid following convertersynchronization stabilityimpedance identificationequivalent impedanceLyapunov function
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