Abstract: Firstly，the significance of impedance modeling for new energy power generation equipment was

analyzed，and the existing impedance modeling methods were explained. Aiming at the problems of low flexible

matching degree，single disturbance signal，fixed disturbance frequency and the inability of real-time measurement results on the PC interface of commercial impedance measurement devices，the experimental system design method suitable for impedance measurement of new energy power generation equipment was discussed. The realization scheme of the new impedance measurement system was described from the aspects of design content，design basis，analysis difficulties and solution.Then，taking the Venable impedance measurement device as the basic platform，a new impedance measurement system based on the disturbance harmonic injection method was designed. The experimental system can generate three independent sine waves that can be flexibly adjusted in frequency，amplitude and phase，and can perform real-time transmission calculation and graphical display of the measurement results.Finally，the effectiveness of the new equipment was proved by experiments. The new impedance measurement system can improve the defects of existing impedance measurement devices and provide a platform for research applications such as new energy power generation systems and grid system stability control. It has good applicability in the field of impedance measurement of new energy power generation equipment with different characteristics.

      Key words: new energy power generation；impedance modeling；impedance measurement；experimental system