Title :
Stability analysis of a Buck converter with input filter based on an LPV formalism
Author :
Lefranc, Pierre ; Godoy, Emmanuel ; Duc, Gilles ; Iftikhar, Muhammad Usman
Author_Institution :
Energy Dept., SUPELEC, Gif-sur-Yvette
Abstract :
This paper presents stability analysis of a buck converter based on an LPV (linear parameter-varying) approach. Theoretical stability analysis of DC-DC converters is not so easy especially with wide variations of input voltage and load. Authors propose a theoretical method that can be used by converter designers. A nonlinear model of buck converter is proposed to achieve stability analysis. The main control law is based on a state-feedback. The input voltage and load power variations are specified in ranges and variations can be as fast as possible. LPV analysis of a PI-feedback and a state-feedback are compared to show drawbacks of conventional PI-feedback. Simulation results are presented to verify stability analysis. They are based on two model levels: a nonlinear averaged model and a switched model.
Keywords :
DC-DC power convertors; circuit stability; network analysis; power filters; DC-DC converters; PI-feedback; buck converter; input filter; linear parameter-varying; nonlinear averaged model; stability analysis; state-feedback; switched model; Analytical models; Buck converters; Capacitors; Inductors; Nonlinear filters; Passive filters; Power generation; Stability analysis; Switches; Voltage;
Conference_Titel :
Power Engineering, Energy and Electrical Drives, 2009. POWERENG '09. International Conference on
Conference_Location :
Lisbon
Print_ISBN :
978-1-4244-4611-7
Electronic_ISBN :
978-1-4244-2291-3
DOI :
10.1109/POWERENG.2009.4915177
