Operation Control Strategy of DC Microgrid Based on E-router

The structure of DC microgrid is important to realize the efficient and flexible access of DC distributed power and load to power grid. In this paper, an operation control strategy of DC microgrid based energy router is proposed. The components of the system are connected to different types of ports of the energy router. On the basis of DC bus voltage stability within the rated range, for different system operation modes, the nine-zone diagram is built under the operating area division of voltage and power. The power control is conducted by changing the port control mode of the energy router in different areas, so as to decrease the frequent changes of energy storage power output caused by system disturbance. Finally, the power interconnection of DC system, the influence of control mode to the stability of energy storage charging and discharging in each area under different operation mode are verified through PSCAD.