Large grounding grid impedance tester simulation verification circuit and method

The invention provides a large grounding grid impedance tester simulation verification circuit and method, and belongs to the technical field of large grounding grid impedance tester verification. The circuit comprises: a current/voltage conversion circuit for converting a test current into a signal V1; the phase shift circuit is used for converting the signal V1 into a signal V2; the digital-to-analog conversion circuit is used for converting the signal V1 into a sinusoidal signal V3; the first true virtual value conversion circuit is used for converting the signal V3 into a direct current signal Vs; the integrator circuit is used for integrating the signal Vs and the direct-current signal Vf to obtain a direct-current signal V5; the multiplier circuit multiplies the signal V5 and the signal V2 to obtain a direct current signal V6; the amplifier circuit amplifies the signal V6 to obtain an output signal V0; the signal attenuation circuit attenuates the signal V0 to obtain a sinusoidal signal V4; and the seco