Abstract
This paper presents a primary droop current-sharing controller that can integrate into voltage feedback controller and, thus, provides a low-cost and simple solution for parallel DC/DC converters system. From the equivalent small-signal model, a two-port network was adapted to describe the output and control variables for designing voltage and droop current-sharing loops. From the analysis results, the designed primary droop current-sharing controller will not affect the original voltage loop gain profile to let the DC/DC converter preserve desire control performance. After designing a stable DC/DC converter with primary droop current-sharing control, the stability of the interconnected parallel DC/DC converters system was studied. When the cable resistance is reduced, when the cable resistance is reduced, the interconnected system might be unstable. Finally, some simulation and experimental results demonstrated the effectiveness of the proposed controller in a prototype parallel DC/DC converters system.
Highlights
The server power system infrastructure consists of frond end AC/DC converters to build up high DC voltage and DC/DC converters to provide power to downstream load
A DC power system consists of many standard DC/DC converters through interconnected cables or copper buses in series or parallel to obtain desire output voltage, current, and power [1,2,3,4]
The results showed the analysis and Advances in Power Electronics design method to obtain a stable interconnected system is to design a stable DC/DC converter and to analysis the stability of the interconnected subsystem [20]
Summary
The server power system infrastructure consists of frond end AC/DC converters to build up high DC voltage and DC/DC converters to provide power to downstream load. After designing a stable DC/DC converter primary with droop current-sharing control, the final interconnected system was analyzed This system consists of many cable wires to parallel connect the output voltages of the DC/DC converters to the system load. If the parameters of the DC/DC converters are identical and symmetric layout interconnected system is designed, that is, the cable resistance is identical In this condition, The reference command setting vrefi of the ith DC/DC converter is perturbed by vrefi, and the resulted output current perturbation ioj for j = 1, . The aforementioned method can be applied to other DC/DC converters like boost converter for example
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