Average-value modeling of a peak-current controlled galvanically-isolated DC-DC converter for shipboard power distribution

Abstract

The average-value model of a peak-current controlled dc-dc converter with galvanic isolation is derived and its accuracy is demonstrated. The two main contributions of this paper are the development of a new peak-current based control which ensures that load fault currents do not propagate through the system and the derivation of an average-value model for the chosen converter topology with the aforementioned control. The proposed control strategy is shown to yield excellent fault performance. The average-value model (AVM) accurately captures most low-frequency dynamics and is much faster to evaluate than a waveform-level model which includes switching. The subject converter and its control are intended for use in a part of a larger distribution system and, in particular, a shipboard DC power system. The comparison between the AVM and a waveform-level model of a laboratory scale DC-DC converter demonstrates the accuracy of the AVM.

Impact of online PPL accommodation on quality of power in an AES’ MVDC distribution system

“…Converters with galvanic isolation are preferable for onboard applications. The DC-DC converter topology [41] shown in Figure 4 with transformer primary current peak control is adopted for the simulation. Service loads and high power pulsed loads are connected to the DC bus Generally PPL is that kind of load, which carries a very high value of current for a short duration.…”