Current distribution control design for paralleled DC/DC converters using sliding-mode control

• Published in: IEEE transactions on industrial electronics (1982) Vol. 51; no. 2; pp. 419 - 428
• Main Authors: Lopez, M., de Vicuna, L.G., Castilla, M., Gaya, P., Lopez, O.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-04-2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Compensators; Control design; Control systems; Converters; Current distribution; DC-DC power converters; Design engineering; Design methodology; Direct current; Electric potential; Power system reliability; Simulation; Sliding mode control; Uninterruptible power systems; Very large scale integration; Voltage
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2004.825273

This paper shows the analysis and design of a parallel-connected converter system using sliding mode control techniques. The design is particularised for a system that consists of N boost converters and a current feedback loop based on a proportional-integral compensator of the output voltage error. The paper emphasises the advantages of the sliding-mode control over the classic design method based on small-signal models, thus providing an effective and robust means of controlling nonlinear multi-input converters. The design is based on the Utkin conditions, which permit us to know the regions under which a sliding mode exists. This fact allows us to design the compensator and to introduce some modifications in the control loop that avoids input-current overshoots during the system startup. Simple design expressions are obtained and verified with simulation and experimental results, thus showing the improvements achieved with the proposed modifications.