Current Sensorless for Power Converters Based on Fuzzy Control

• Main Authors: Chen-Chun Fan, 范振鈞
• Other Authors: Kuang-Yow Lian
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/xxktr7

碩士 === 中原大學 === 電機工程研究所 === 92 === Current sensorless control for converters is an observer-based method that provides the output regulation without using current sensors. At beginning, we utilize Averaging Method for One-Time-Scale Discontinuous System (AM-OTS-DS) to derive the models of buck converters and flyback converters. In order to achieve zero steady-state regulation error and robust performance, an integral-type controller is proposed. In this thesis, we propose three observer-based control schemes to deal with regulation problem of buck converter and flyback converter. These schemes include i) Basic fuzzy tracking control; ii) Tracking control scheme with simpli ed design method; and iii) Stabilization scheme via coordinate translation. The stability of the overall closed-loop systems is rigorously analyzed using Lyapunov method. Based on a mild assumption, the separation principle still succeeds in these control problems. Hence, the control gains and observer gains can be separately obtained by solving LMIs. The hardware of the conventional PWM buck converter and yback converter are implemented. The fuzzy observer-based controller is realized by DS1103 and SIMULINK. Experiment results verify the feasibility of the proposed schemes and illustrate nice performance for the power converters.