Analysis and Control of a Buck DC-DC Converter Operating with Constant Power Load in Sea and Undersea Vehicles

Power-electronics-based zonal direct current (dc) power distribution systems are being considered for sea and undersea vehicles. The stability of the dc power-electronics-based power distribution systems is a significant design consideration because of the potential for negative-impedance-induced instabilities. In this paper, the dynamic properties and control of a buck converter feeding a downstream dc–dc converter are studied. The controller in this system combines an instantaneous current feedback loop using hysteresis with a proportional–integral (PI) algorithm to regulate the output voltage of the converter. Based on a large-signal-averaged model of the converter, the stability-in-large around the operation point is presented. The complete analysis is carried out considering a buck dc–dc converter operating with a constant power load (CPL). Simulations and experimental results are provided to verify the analysis.