昇壓型直流-直流轉換器之模糊時間延遲回授混沌控制

Fuzzy Time Delay Feedback Chaotic Control for Boost DC-DC Converters

陳智遠(Chih-Yuan Chen)

指導教授 ： 王順源 ； 曾傳蘆

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2013年)

摘要

本論文利用模糊時間延遲回授控制器抑制昇壓型直流-直流轉換器的混沌與分叉現象。當昇壓型轉換器進入非線性混沌狀態時，如何有效並快速的將混沌狀態控制在週期1之穩態，時間延遲回授控制為常見的混沌控制方法。不過此方法的缺點為控制參數選取困難且一旦確定後便無法修改，故本論文利用模糊系統調整其時間延遲回授參數 ，此控制方法無須複雜之數學式推導且結構簡單易於實現。
本研究首先推導出電流模式控制昇壓型直流-直流轉換器之數學模型，並利用MATLAB/SIMULINK建模，藉由改變參考電流、輸入電壓和負載電阻參數值，觀察轉換器輸出特性由周期性穩態進入倍周期分叉直到轉換器呈現非線性混沌狀態。當混沌現象發生時，經由誤差及誤差變化率調整時間延遲回授參數 使系統穩定在週期一之軌道上。模擬結果證實，當轉換器進入倍週期分岔與混沌現象時，模糊時間延遲回授控制器皆能有效的將轉換器輸出特性控制在週期1之穩態下，由此驗證模糊時間延遲回授混沌控制器具有良好的抑制混沌現象能力，並能減小輸出漣波使轉換器可靠度提升。

關鍵字

昇壓型轉換器 ； 非線性系統 ； 混沌 ； 模糊控制 ； 時間延遲回授控制

並列摘要

In this thesis, a fuzzy time delay feedback controller is proposed to suppress the chaos and bifurcation phenomenon of boost DC-DC converters output. When the nonlinear chaotic states of boost converter is observed, to effectively and quickly control the chaotic state to stay at Period 1 steady state, time delay feedback control is a commonly used method of controlling chaos. However, this method has the disadvantages that the selection of control parameters is difficult and the selected values can not be modified once identified. Therefore, this study make the use of fuzzy system to adjust the time delay feedback parameter K. This control method is simple-structure without complicated mathematical formulas and easy to implement.
This study first deduces the mathematical model that current-mode controlled boost DC-DC converters and establishes MATLAB / SIMULINK model. Then, change the reference current, the input voltage and load resistance values, until the periodic steady-state output characteristics enter into the period-doubling bifurcation, i.e., the converter is in nonlinear chaotic state. When chaos occurs, the fuzzy time delay control adjusts the parameter K according to the error and error rate of change to stabilize the system remaining at the Period 1. Simulation results confirm that when the converter enters into the period-doubling bifurcation and chaotic phenomena occurs, the proposed fuzzy time delay feedback controller effectively controls the converter output characteristic with the Period 1 steady state, which demonstrates the controller has good ability to suppress chaotic phenomena and reduce the output ripple.

並列關鍵字

Boost converter, nonlinear system ； chaos ； fuzzy control ； time delay

參考文獻

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