Method and system for measuring broadband impedance characteristics of wind turbine generator in sequence

The invention provides a method and a system for measuring broadband impedance characteristics of a wind turbine generator in sequence. The method comprises the following steps: injecting set disturbance voltage into the wind turbine generator to carry out on-load test to obtain parameters of the wind turbine generator; extracting a positive-sequence voltage component, a negative-sequence voltage component, a positive-sequence current component and a negative-sequence current component based on the wind turbine generator parameters in combination with a discrete Fourier transform algorithm; and calculating the positive sequence impedance, the negative sequence impedance and the coupling impedance of the wind turbine generator based on the positive sequence voltage component, the negative sequence voltage component, the positive sequence current component and the negative sequence current component. According to the method, the broadband positive sequence, the broadband negative sequence and the coupling imped