Research on High Voltage High Capacity Multi-port Energy Router

Energy routers are key devices that promote the utilization and consumption of new energy resources, as well as achieve energy conversion and routing. This article proposes a new idea of high-voltage and large-capacity energy routers for regional energy management. A 110kV seven-port energy router electrical topology is constructed, consisting of three modular multi-level AC/DC converters, three bidirectional DC/DC transformers, and one DC circuit breaker. A detailed analysis is conducted on four different operating modes and the respective control strategies of the energy router. The VF droop controller is designed, including voltage droop control and frequency droop control. For demonstration engineering applications, an energy router start stop control logic has been designed. Finally, the effectiveness of the control strategy proposed in this paper is verified through the switching test waveforms between the main operation mode and auxiliary operation mode on the demonstration project site.