電源轉換器之隨機模糊控制器設計

在本論文中，我們是針對切換式電源轉換器的特性做研究，因為時代的進步，因此電力產品的需求也日益增加，而切換式電源轉換器因為具有輕巧及高效率，所以受到很大的重視。然而它的EMI 效應值得進一步研究，所以本篇論文針對其效應，提出了隨機模糊理論來設計控制器，以降低雜訊干擾對切換式電源轉換器的影響。首先我們考慮切換式電源轉換器之儲能電感受到雜訊的影響，針對此一現像，我們提出非線性隨機T-S 模糊控制理論，對上述電源轉換器進行輸出電壓穏壓控制。為了確保輸出電壓誤差會收斂至零，因此我們引進了誤差積分狀態至原電源轉換器的系統方程中，從而推出積分型隨機T-S 模糊控制器。利用座標轉換以穏態工作點做為新座標之原點，兼以積分型控制器之強健性，可以使控制器變得十分精簡。電源轉換器之EMI 干擾起因複，相關文獻有將此干擾等效視為對PWM 鋸齒波之影響，針對此觀點，我們也推出隨機模糊追蹤控制器，以達到控制輸出穏定。以上兩者方法皆利用LMI 來分析系統的穏定性及求解控制增益。我們先以MATLAB 完成閉迴路系統的模擬，而在實作上以類比積體電路以及利用DS1103PPC 單板來實現積分型隨機T-S 模糊控制器，並且經由示波器上所顯示的輸出電壓響應驗証了積分型隨機T-S 模糊控制的可行性。

關鍵字

降壓型電力轉換器；零穏誤差；積分型隨機T-S模糊控制； T-S模糊模式

並列摘要

In this thesis we consider the output regulation problem for DC-DC converters. The electronic device is subjected to many kinds of disturbances, which include the electromagnetic interference due to high-frequency switching, the considerable variations in ambient temperature, the unpredictable changes of line voltage and loading, and so on. Sometimes we treat the noise-like disturbances as deterministic variables. However, the noise are more adequately described by random processes. The stochastic aspects of the model are used to capture the uncertainty about the surrounding environment where the system is in operation. In light of this, we propose a stochastic integral fuzzy controller to deal with the output voltage regulation problem for a PWM buck converter. First, the averaging method of One-Time-Scale Discontinuous System (AM-OTS-DS) [2] is used to derive the models of buck converters. Second, in order to achieve mean zero steadystate regulation error, an integral-type controller is proposed. The standard T-S fuzzy model is established after we translate the coordinates to the regulated point. Then, the stability and the feedback gains are proven and obtained respectively, by solving LMIs via MATLAB.Finally, the hardware of the conventional PWM buck is implemented. The stochastic fuzzy controller is realized by a digital circuit and a analog circuit. Experimental results verify the feasibility of the proposed schemes and illustrate the performance of the power converter.

並列關鍵字

stochastic integral fuzzy control ； zero steady state ； Buck converter ； T-S fuzzy model

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 and Theoretical Basis," IEEE Conf. Syst, pp.1165-1172, 1992.

[3] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics, John Wiley and Sons, Inc. 1995.

[4] H. K. Lam, F. H. F. Leung, and P. K. S. Tam, "Stable and Robust Fuzzy Control for Uncertain Nonlinear Systems," IEEE Trans. Syst., Man, Cybern. A, vol. 30, no. 6, pp.825-840, Nov. 2000.

[5] K. Y. Lian, T. S. Chiang, C. S. Chiu and P. Liu, "Synthesis of Fuzzy Model-Based Designs to Synchronization and Secure Communications for Chaotic Systems," IEEE Trans. Syst., Man, Cybern. B, vol. 31, no. 1, pp.66-83, Feb. 2001.

國際替代計量

電源轉換器之隨機模糊控制器設計

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