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Analysis and control of a buck DC-DC converter operating with constant power load in sea and undersea vehicles

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5 Author(s)
Rivetta, C.H. ; Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA ; Emadi, A. ; Williamson, G.A. ; Jayabalan, R.
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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.

Published in:

Industry Applications, IEEE Transactions on  (Volume:42 ,  Issue: 2 )

Date of Publication:

March-April 2006

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