Large-signal stability analysis of two power converters solutions for DC shipboard microgrid

摘要

Bus voltage stability is an essential requirement in DC shipboard microgrids. In presence of Constant Power Loads, voltage instability is strictly dependent on RLC filters. This paper evaluates two power converter solutions (Thyristor Converters, TCs, and diode rectifiers + DC-DC Converters, DCs) for interfacing AC machines and DC bus. Firstly, TCs and DCs filters are sized maintaining same targets, i.e. voltage ripple and small-signal damping factor. Secondly, Lyapunov stability analysis investigates the large-signal behavior of TCs and DCs power systems. Identical Regions of Asymptotic Stability prove the feasibility of TCs, which can therefore constitute a cost-effective alternative to DCs solution.