Abstract: With the extensive integration of distributed energy and random loads, the problem of three-phase load imbalance and transformer light and heavy load operation in the distribution station area is becoming increasingly prominent, which will threaten the safe and reliable operation of the station area. However, existing research on interconnected substations only focuses on a single regulatory objective, and few comprehensive governance issues balance three-phase imbalance and light and heavy load operation. The article proposes a comprehensive control strategy for three-phase imbalance and light and heavy loads in the flexible interconnected distribution station area based on a four-leg soft open point (F-SOP). Firstly, the comprehensive loss characteristics of F-SOP and transformers were analyzed, and the results showed that both imbalance and load rate would affect the operational efficiency of the equipment. Secondly, a comprehensive control strategy model for three-phase imbalance and light and heavy loads must be established, indicator constraints for transformer output power imbalance and load rate established, and the F-SOP optimal control command must be solved with the optimization goal of minimizing system comprehensive loss. Next, an improved peer-to-peer control method is proposed to improve the stability and dynamic performance of F-SOP, ensuring the implementation of comprehensive control strategies, in response to F-SOP topology architecture and power regulation requirements. Finally, the effectiveness and feasibility of the proposed comprehensive control strategy were verified through numerical analysis and simulation experiments.