Modeling method for two-level current transformer

The invention discloses a modeling method for a two-level current transformer. The modeling method comprises the following steps of: applying input voltage at two ends of a general bridge arm circuit, and applying input current to a connection wire between an upper tube circuit and a lower tube circuit; judging gate poles of a first switch element and a second switch element receive pulse width modulation (PWM) control signals; if the gate poles of the first switch element and the second switch element receive the PWM control signals, determining a bridge arm conduction state of the general bridge arm circuit according to the PWM control signals and the input current; determining alternating current side output voltage and direct current side output current of the general bridge arm circuit according to the bridge arm conduction state; and determining a relation between the alternating current side output voltage of each general bridge arm circuit in the current transformer and the alternating current side output voltage of the current transformer, and determining a relation between the direct current side output current of each general bridge arm circuit in the current transformer and the direct current side output current of the current transformer.