Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 50, Issue 2, Pages 1448-1458Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2013.2273751
Keywords
Buck converter; constant power load; dc/dc converter; medium-voltage dc (MVDC) system; sliding-mode controller (SMC); stability
Funding
- U.S. National Science Foundation [ECCS-0954938]
- University of Nebraska-Lincoln College of Engineering
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0954938] Funding Source: National Science Foundation
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Incorporating a medium-voltage dc (MVDC) integrated power system is a goal for future surface combatants and submarines. In an MVDC shipboard power system, dc/dc converters are commonly employed to supply constant power to electric loads. These constant power loads have a characteristic of negative incremental impedance, which may cause system instability during disturbances if the system is not properly controlled. This paper proposes a sliding-mode duty-ratio controller (SMDC) for dc/dc buck converters with constant power loads. The proposed SMDC is able to stabilize the dc power systems over the entire operating range in the presence of significant variations in the load power and input voltage. The proposed SMDC is validated by both simulation studies in MATLAB/Simulink and experiments for stabilizing a dc/dc buck converter with constant power loads. Simulation studies for an MVDC shipboard power system with constant power loads for different operating conditions with significant variations in the load power and supply voltage are also provided to further demonstrate the effectiveness of the proposed SMDC.
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