Due to the development of renewable energy sources, the conventional grid will not be able to meet the requirement of interfacing of multiple kinds of electrical source and multiple kinds of load. To achieve large scale consumption of renewable energy sources, China is developing the energy internet. The core equipment of energy internet is the energy router. The energy router is based on power electronic technology; it can provide multiple kinds of electrical ports to interface multiple kinds of renewable electrical source as well as providing a flexible power flow management between ports. This paper is a study on control strategy of a five-port (including an energy storage port) energy router. The energy rougher is made up of modular multilevel converter (MMC), dual active bridge(DAB), conventional low-voltage inverter and a bipolar DC/DC converter for battery. This paper studies the control strategy of each individual stages. Besides the control strategy of individual stages, this paper proposed a load power feed forward control to reduce the DC voltage ripple under load change thus improving the DC voltage supply quality. The proposed control strategies are verified by simulation results.
