Suppressing fast load transients and improving dynamic performance in DC telecom power systems and data centers

It is envisioned that in future dc power distribution of telecom systems and data centers the smart loads will communicated with sources informing of the changes in operation. This paper presents a strategy based on a preenergized auxiliary power circuit to suppress fast transients from electronic loads. Since the transient-occurrence time will be informed by the load, the auxiliary circuit will pre-energize the dc bus and will inject additional current to counteract the change in load and in this way smooth the transient. In this paper, the design and operation principle of the proposed auxiliary circuit is explained. The proposed approach is verified in a dc microgrid model with 380 VDC and 24 VDC buses and is shown to be very effective in suppressing the load transients.