A Unified Adaptive Damping Ratio Control for Multitype DC–DC Converters in Shipboard Power Systems

Multitype dc–dc converters (MDDCs) are essential interface circuits in shipboard power systems, and their controls are critical in achieving fast voltage regulation. However, the complexity of addressing varying transients and the nonlinearity of duty-cycle saturation, pose challenges to achieving high control performance while maintaining weak parameter dependence. This article proposes a unified adaptive damping ratio control (UADRC) for nonisolated MDDCs. The mechanism of voltage regulation is investigated, enabling the voltage to be adjusted quickly and accurately through the damping ratio. By utilizing adaptive damping ratio design, the number of controller parameters is significantly reduced to no more than one, simplifying parameter tuning, and greatly enhancing voltage regulation. Furthermore, the optimal damping ratio available is discussed for different types of MDDCs, accounting for the impact of duty-cycle saturation. This ensures that the voltage regulation can always operate optimally, thereby minimizing the performance discrepancy caused by duty-cycle saturation. Simulations and experimental results demonstrate that the UADRC can always achieve fast voltage regulation for MDDCs under varying transients while having small static errors in steady states.