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 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.

[1]  Slobodan Cuk,et al.  A general unified approach to modelling switching-converter power stages , 1977 .

[2]  C. K. Michael Tse,et al.  A unified approach to the design of PWM-based sliding-mode voltage controllers for basic DC-DC converters in continuous conduction mode , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  V. Grigore,et al.  Dynamics of a buck converter with a constant power load , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[4]  Stanley R Huddy,et al.  Amplitude Death Solutions for Stabilization of DC Microgrids With Instantaneous Constant-Power Loads , 2013, IEEE Transactions on Power Electronics.

[5]  M. Ehsani,et al.  Negative impedance stabilizing controls for PWM DC-DC converters using feedback linearization techniques , 2000, Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022).

[6]  Philip T. Krein,et al.  On the use of averaging for the analysis of power electronic systems , 1989 .

[7]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[8]  Mehrdad Ehsani,et al.  On the Concept of Negative Impedance Instability in the More Electric Aircraft Power Systems with Constant Power Loads , 1999 .

[9]  D. Howe,et al.  Large signal stability analysis of DC power systems with constant power loads , 2008, 2008 IEEE Vehicle Power and Propulsion Conference.

[10]  Dawei Xiang,et al.  An Industry-Based Survey of Reliability in Power Electronic Converters , 2011, IEEE Transactions on Industry Applications.

[11]  B. Nahid-Mobarakeh,et al.  Large-Signal Stabilization of a DC-Link Supplying a Constant Power Load Using a Virtual Capacitor: Impact on the Domain of Attraction , 2012, IEEE Transactions on Industry Applications.

[12]  Kevin McCoy,et al.  Next Generation Integrated Power System: NGIPS Technology Development Roadmap , 2007 .

[13]  Vadim I. Utkin,et al.  Sliding mode control in electromechanical systems , 1999 .

[14]  Chi K. Tse,et al.  An Evaluation of the Practicality of Sliding Mode Controllers in DC-DC Converters and Their General Design Issues , 2006 .

[15]  D. Giaouris,et al.  Adaptive PD+I Control of a Switch-Mode DC–DC Power Converter Using a Recursive FIR Predictor , 2011, IEEE Transactions on Industry Applications.

[16]  Ali Emadi,et al.  Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives , 2006, IEEE Transactions on Vehicular Technology.

[17]  Weiping Li,et al.  Applied Nonlinear Control , 1991 .

[18]  F. L. Luo,et al.  Design and analysis of adaptive sliding-mode-like controller for DC-DC converters , 2006 .

[19]  H. Sira-Ramírez.  A geometric approach to pulse-width modulated control in nonlinear dynamical systems , 1989 .

[20]  M. Liserre,et al.  Power Electronics Converters for Wind Turbine Systems , 2012, IEEE Transactions on Industry Applications.

[21]  Norbert Doerry,et al.  Functional Decomposition of a Medium Voltage DC Integrated Power System , 2008 .

[22]  Boon Teck Ooi,et al.  DC voltage limit compliance in voltage-source converter based multi-terminal HVDC , 2005, IEEE Power Engineering Society General Meeting, 2005.