Abstract: Under the goal of "dual carbon", the construction of a new type of power system is the key content and important carrier of the construction of a new energy system, and it is an extremely challenging and pioneering system engineering. With the advancement of a new type of power system, more and more power electronic nonlinear loads are widely used, the voltage and current waveform in the power system is not an ideal sinusoidal waveform, and the system contains a large number of DC components. More attention has been paid to the accuracy of electricity metering under this non-ideal power grid. In this paper, starting from the study of the transmission characteristics of the transformer when the system contains DC components, the influence of the DC component on the transmission characteristics of the transformer is analyzed, and a compensation circuit to reduce the ratio difference of the transformer under the DC component is proposed. This compensation circuit synchronously compensates for the deviation of the magnetic flux of the transformer core caused by the DC component, so that the transformer is in the linear range within the measurement range, so as to ensure the accuracy of electricity metering. Experiments have verified that when there is a DC component in the system, the compensation circuit can significantly improve the accuracy of electricity metering of the transformer.