Event-triggered Mechanism Based Control Method of SMES to Improve the Stability of DC Bus Voltage in Data Centers

This paper presents a reliable power supply scheme for 2N power supply architecture in data center including superconducting magnetic energy storage system (SMES). The scheme has two DC voltage levels of 240V and 575V. By taking the advantage of the power type energy storage, this scheme can maintain the 240V DC bus voltage and ensure the dual supply load without interruption when the power supply line switches or the AC grid faults. Besides, the 575V DC bus makes it possible to access the distributed generation and improve energy efficiency of data center. A 2N architecture power system is modelled in hardware-in-the-loop (HIL) testbed. Comparative case studies are conducted to demonstrate the effectiveness and reliability of the proposed scheme.