At present, there are ongoing reforms in the energy system, with a significant emphasis on establishing a power system primarily driven by renewable energy sources. With the increasing number of distributed solar power sources being linked to transmission lines, the structure and operational status of distribution networks are changing, posing a serious threat to their power supply reliability. Intended to mitigate node voltage fluctuations in the new distribution network, this paper proposes the application of Distributed Power Flow Controllers (DPFC), originally designed for high-voltage transmission networks, in distribution networks operating at medium and low voltage levels. Firstly, after a detailed analysis of the operating modes of DC capacitors in DPFC, a distributed power flow controller based on fuzzy PI control of DC capacitor voltage loops is proposed. Finally, simulation verification using the IEEE-33 bus distribution network model in PSCAD/EMTDC demonstrates the steady-state tracking capability of fuzzy PI control and the voltage regulation properties of the distributed power flow controller in various application scenarios. This confirms the feasibility of the proposed solution for mitigating voltage fluctuations in medium and low-voltage distribution networks using distributed power flow controllers.