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

• Published in: IEEE transactions on industry applications Vol. 42; no. 2; pp. 559 - 572
• Main Authors: Rivetta, C.H., Emadi, A., Williamson, G.A., Jayabalan, R., Fahimi, B.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.03.2006; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Buck converter; Buck converters; constant power loads; control; Control systems; Converters; dc-dc converters; DC-DC power converters; Direct current; Dynamical systems; Dynamics; Feedback loop; modeling and analysis; Pi control; Power distribution; Proportional control; sea and undersea vehicles; Stability; Undersea; Vehicle dynamics; Vehicles; Voltage control
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2005.863903

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.