無電流感測電源轉換器之模糊控制

Current Sensorless for Power Converters Based on Fuzzy Control

范振鈞(Chen-Chun Fan)

指導教授 ： 練光佑

中原大學/工學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400213

摘要

由於切換式電源轉換器具有輕巧及高效率之特長，為符合節省能源之時代要求；我們選擇傳統PWM 降壓型(Buck)電源轉換器以及返馳型(Flyback)電源轉換器，利用不連續系統單時間尺度平均法(AM-OTS-DS)求得兩種電源轉換器的非線性數學模式。
在本論文中，我們利用適用於非線性系統控制的T-S模糊模式(Takagi-Sugeno fuzzy model)，對上述直流-直流電源轉換器(DC-DC power converter)作T-S模糊模式化，再加入一誤差積分狀態來消除穩態誤差及增加強健性(Robustness)，針對此積分型非線性系統利用模糊追蹤控制的理論設計模糊控制器以達到輸出電壓穩壓控制；為了節省電流感測器，對系統設計模糊估測器以重建電流狀態。另外，利用座標轉換以穩態工作點做為新座標之原點，兼以積分型控制器之強健特性，可以使控制器變為十分精簡。在章節中，我們詳述對閉迴路系統的穩定性分析以及呈現模擬結果和實驗波形圖。
最後我們實作上述兩種直流-直流電源轉換器，利用DS1103 PPC 單板以及 MATLAB’s Simulink 來實現模糊控制器以及模糊估測器，而實作結果也驗證了輸出電壓穩壓的效果。

關鍵字

降壓型電源轉換器 ； 模糊追蹤控制 ； 強健性 ； 零穩態誤差 ； T-S 模糊模式 ； 返馳型電源轉換器 ； 模糊估測器 ； 積分型模糊控制

並列摘要

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.

並列關鍵字

integral fuzzy control ； fuzzy tracking control ； zero seteady state error ； flyback converter ； T-S fuzzy model ； robustness ； fuzzy observer ； buck converter

參考文獻

[1] A. I. Pressman, Swithcing Power Supply Design," McGraw-Hill, 1999.

[2] J. Sun and H. Grotstollen, "Averaged Modelling of Switching Power Converters: Reformulation

Wiley and Sons, Inc. 1995.

[4] H. K. Lam, F. H. F. Leung, and P. K. S. Tam, "Stable and Robust Fuzzy Control

Designs to Synchronization and Secure Communications for Chaotic Systems," IEEE