A New DC Decoupling-Based DC Bus Voltage Optimisation Strategy for Energy Routers

The energy router enters the islanding state when the AC distribution network fails, although both the energy storage port and the DC port can stabilise the internal DC bus voltage in voltage control mode, the capacity of distributed energy storage is limited, and it is difficult to maintain the power balance of the energy router for a long period of time, so the DC port is the core end of the energy router controlling the DC bus voltage under the islanding, and in this paper, based on the operation mechanism of the voltage control of DC ports under the islanding and the Based on the operation mechanism of DC port voltage control under islanding and the problem that the existing DC port voltage control strategy cannot optimise the DC bus voltage control performance under full transmission power due to the coupling of the control system with the transmission power steady state point, this paper puts forward a DC decoupling control strategy by simplifying the control system parameter design method, and the simulation results show that this strategy effectively improves the control performance of the DC bus voltage of the energy router under islanding, and strengthens the robustness of the output voltage of each port of the energy router under islanding. robustness of the output voltage of each port.