To overcome the intermittency problem, this paper proposes a DC bus stabilization coordinated control method of distributed photovoltaic-energy storage (PV-ES) DC generation system. For the low-voltage and high-current output characteristics of the PV module and the battery, three-phase parallel converters are adopted in the proposed system, which can effectively inhibit output voltage fluctuation. For PV converters, an improved extremum seeking algorithm is designed to achieve maximum power output. For ES bidirectional converters, a voltage current dual-loop control algorithm is proposed. Based on flatness principle, an outer voltage loop control law is derived, the control algorithm can improve the DC bus stabilization with control parameter perturbation or a load mutation in a large range. Combined with inner current loop control, the control algorithm can significantly smooth the output power. Simulation model is constructed in Matlab/Simulink platform, the results show that the proposed algorithm has a higher stability and a smaller static error. This work is supported by National Natural Science Foundation of China (No. 51207086 and No. 51407114).