Due to significant issue of energy consumption and sharp power demand of information and computing systems in worldwide, the applications of DC micro-grid that can utilize renewable energy sources such as photovoltaic power and wind energy have been advanced. Consequently, a DC micro-grid should be upgraded to achieve high reliability in power distribution systems. For DC power distribution in a data center, power managements including power flow control and demand analysis are highly recommended. In this paper, a prototype of DC power distribution system is proposed using the triple active bridge (TAB) converter for data centers. Furthermore, the power management for distributed system uses the TAB converter for power flow control is introduced. Eventually, performance test of power management in high reliable system is verified by simulation, and the reliability analysis proved the reliability of proposed system superior than the conventional power distribution systems.