Based on modularized high frequency isolation power conversion system, an experimental model of DC distribution system with photovoltaic, energy storage system and AC loads is built. Three system operation modes are designed and a hierarchical logic control system with the main control variable of DC bus voltage is proposed through analyzing system P-V relationships and operating characteristics of various network interface modules. The hierarchical logic control system is divided into 4 control layers, including data acquisition, pattern recognition, logic combination and instruction execution. Between the layers, it takes a way of local control to ensure the system power balance, voltage stability and coordination between various interface modules through the discrete out of 12 sub-controllers without internet communication. Finally, Matlab/Simulink experiments are conducted to verify the validity and effectiveness of the proposed control strategy in DC distribution system operation and control. Thiswork is supported by Technology Development Plan of State Grid Corporation of China (No. [2015]90 and No. [2015]457).