Abstract: A cooperative control method for multi-port energy routers in distributed distribution networks was

proposed. Under the premise of power balance and bus voltage stability，seamless switching of various working

modes of multi-port energy routers was realized to ensure the security and stability of distribution network

operation. In this method，the four-port energy router topology including grid connection interface，battery

interface，load interface and photovoltaic interface was selected as the cooperative control object，distributed and

centralized control was used to design a hierarchical cooperative control method to realize the current sharing and

voltage stabilization control of battery charging and discharging，and the DC bus voltage stability and power

balance control during the switching of working modes，so as to seamlessly switch various working modes，realize

the purpose of cooperative operation of various working modes. The results show that under the control of this

method，the energy storage battery in the multi-port energy router can achieve the balance of the charging current of the two-phase circuit in the constant current charging process，and maintain the stability of the battery current and voltage in the constant voltage charging and discharging process，and maintain the stability of the bus voltage in the constant voltage discharging process. In the process of switching multiple working modes，the energy router can realize the balance of power and the stability of DC bus voltage，thus providing guarantee for the stable and safe operation of the distributed distribution network.

      Key words: distributed distribution network；multi-port；energy router；cooperative control；battery charge and discharge；seamless switching