An inductor simulation method and nonlinear equivalent circuit model enabling dynamic simulation of nonlinear characteristics when a direct current is superimposed with high precision. An equivalent circuit of an inductor is represented using a series circuit of passive circuit elements. Characteristic change ratios of the passive circuit elements when a direct current is superimposed are expressed as an approximate function on the basis of actually measured values. A reference current measured by each of voltage source models is referred to by a control voltage source connected in series to the passive circuit elements. The characteristic change ratios are calculated in accordance with the reference current Iref. Difference voltages are generated on the basis of the characteristic change ratios and voltages occurring when no direct current is superimposed, they are superimposed on the voltages VL1 and VR1 occurring when no direct current is superimposed, thereby simulating the nonlinear characteristics.
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