In order to realize low-carbon operation of power grid and high proportion of clean energy consumption is one of the important ways for State Grid Company to implement the energy security strategy of “four revolutions and one cooperation” and help achieve the goal of “carbon peak and carbon neutralization”. Distributed energy, electric vehicles and other interactive energy are widely connected, a variety of new energy needs continue to emerge, all aspects of the source load storage are connected by the converter, which has a profound impact on the operation of the power system. In the process of new energy grid connection and new energy equipment power into the network, the converter is a necessary equipment, which plays a key role in the AC/DC conversion of network source load, Energy loss is also accompanied in the process of transformation. How to accurately measure the energy transfer before and after transformation is of great significance to the comprehensive evaluation of energy efficiency of distribution network, source network load storage collaborative optimization control, and improvement of energy efficiency. Based on the basic principle of electric energy measurement before and after AC/DC energy conversion, this paper analyzes the main factors that affect the measurement in the process of converter conversion, Different processing methods for different influencing factors are studied and verified by simulation, Finally, the influence of various factors on the measurement accuracy of grid connected converter is given, and suggestions on how to reduce the influence are given.