Adaptive Damping Ratio Control of Parallel Buck Converters for the Marine Pulsed Power Loads

Parallel buck converters are increasingly being taken to interface pulsed power loads (PPLs) in ships. The voltage of the converters will deteriorate under the periodic power steps of PPL in a very short time. To this end, this article proposes an adaptive damping ratio control (ApDRC) for the parallel converters. The mechanism of voltage regulation is explored, enabling the voltage to be regulated directly and accurately by the damping ratio of the system. Unlike most existing controls, of which performances are parameter-associated, ApDRC is parameter-independent through adaptive damping ratio design, such that good voltage regulation can be always ensured regardless of varying changes in the load. Moreover, the load transient evolution is first investigated, revealing how duty-cycle saturation affects the load transients, and what is the corresponding solution. Experimental results demonstrate that the proposed control can achieve fast voltage regulation while having small static errors and good disturbance rejection.