In response to the problem of insufficient renewable energy supply or excess renewable energy storage, this paper designs a four port DC/DC converter based on the integration of dual Buck-Boost and CLLC for distributed generation systems. This topology structure integrates the two-phase interleaved parallel Buck-Boost converter and CLLC resonant converter together, realizing the reuse of power switch tubes. This paper first introduces the derivation process of the topology structure, analyzes its gain characteristics, and designs the resonance parameters in the CLLC resonant cavity. Then, photovoltaic and energy storage batteries were applied to the converter, and the power flow state under different operating conditions was analyzed, as well as the dynamic control strategy for energy exchange between each port. Moreover, the results of theoretical and numerical analysis methods demonstrate that the proposed converter achieves stable power flow control and high efficiency under various operating scenarios. Finally, MATLAB/Simulink software was used to simulate the input/output power and voltage of each port under different lighting intensities, verifying the effectiveness of the four-port converter in practical application scenarios and the feasibility of corresponding control strategies, while greatly improving power density and energy transmission efficiency.