A Sliding-Mode Duty-Ratio Controller for DC/DC Buck Converters With Constant Power Loads

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on industry applications 2014-03, Vol.50 (2), p.1448-1458
Main Authors: Zhao, Yue, Qiao, Wei, Ha, Daihyun
Format: Article
Language:English
Subjects:
Buck converter
constant power load
DC-DC power converters
dc/dc converter
Impedance
medium-voltage dc (MVDC) system
Power system stability
Random access memory
sliding-mode controller (SMC)
stability
Stability analysis
Switches
Uninterruptible power supply
Voltage control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2013.2273751