Medium voltage power distribution architecture with medium frequency isolation transformer for data centers

Abstract

In this paper, a medium-voltage (MV) data center power distribution system (DC-PDS) architecture using medium-frequency (MF) link transformer isolation is introduced. The proposed approach significantly improves power density while maintaining high efficiency compared to conventional line-frequency based solutions. The approach also contributes to a reduction in PVC or copper used in conventional DC-PDS. First the MV transformed from the utility, is interfaced with a MV switch gear system and a diesel power generator (DPG) system. Then this MV is converted to the low voltages (LVs) required by the loads via MF transformer. The MF transformer primary side windings are connected to stacked AC-AC converters. The LV secondary windings are interfaced with several load systems and battery energy storage system (BESS) using different topologies like boost power factor corrector (PFC), PWM inverter, etc. The presence of MV switch gear and MF transformer in the architecture results in higher efficiency and power density.