Taking DC/AC power conversion as the research object, this paper comparatively analyzes topology structure. From standpoint of modular engineering application, three level DC/AC standard power module is developed based on improved T scheme and the structure and cabinet assembly are introduced in order to meet the power combination of plug and play, and then to adapt to photovoltaic power generation, wind power generation, energy storage, electric vehicles and other application scenarios. Current situation of technical specifications and standards are analyzed. The function of the DC/AC module in different application scenarios is illustrated and the experiments are carried out based on AC-DC hybrid microgrid test system.