Railway transportation hub faces the challenge of low utilization of negative sequence (NS) and regenerative braking energy (RBE). This paper proposes a modular multilevel three-port energy router (MM-TER) with integrated energy storage, including back-to-back modular multilevel converter, energy storage system and isolated DC-DC converter. On this basis, a coordinated operation control strategy of MM-TER is proposed. The upper layer determines the operation mode and calculates the reference power of each port. The lower layer realizes the fast tracking of the reference power and the rapid response of the mode switching. Finally, the case analysis shows that the MM-TER proposed in this paper significantly improves the utilization rate of RBE and NS compensation.