Energy Storage Systems
Technical Dialogue Session
Renewable Energy Systems II
battery backup unit, battery impedance measurement, DC-DC converter, Busbar regulation, data center
This digest presents an evaluation of switched-mode control for battery backup unit (BBU) in data center to realize busbar voltage regulation and battery impedance detection. There are two control modes in the presented BBU control system. In control mode I, the busbar voltage is regulated at the desired reference value by regulating the duty cycle of DC-DC power converter. In the control mode II, the BBU is bypassed from Busbar and connected to a test load, at the same time, a perturbation signal at a given frequency is added to the duty cycle of power converter to perturb voltage and current of li-ion battery in BBU.