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

fYear

2009

fDate

18-20 March 2009

Firstpage

140

Lastpage

145

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/POWERENG.2009.4915177

Filename

4915177