DSP控制UPS正弦穩壓的分析、設計與實現

Abstract

本論文針對UPS的交流穩壓問題，提出一種以單晶片DSP(TMS320F240)為基礎的數位控制方法。本論文從控制的觀點針對UPS換流器的開路特性做了詳盡的分析，其中對於電感電流漣波、輸出電感壓漣波之計算與對換流器整體性能扮演關鍵性角色的輸出濾波器之電路元件選取，進行了系統化的分析與模擬，並以頻域響應為基礎，提出UPS交流穩壓數位控制器的設計方法。由於本論文採用多迴路控制架構，因此針對電流內迴路與電壓外迴路的頻寬與取樣頻率的估計與選擇，本論文亦提出一方法加以分析討論。最後以MATLAB針對所設計出數位控制器做整體閉迴路性能的系統模擬，並以本實驗所發展出的數位控制單板完成不斷電電源供應系統中脈寬調變換流器之控制。

This paper presents the modeling, analysis, design, and realization of a DSP-based digital controller for the output sinusoidal realization of a UPS. From the view point of control, the article analyzes open-loop characteristics of a UPS inverter in detail, and the design method of AC voltage regulation digital controller are proposed based on frequency domain response. It wasalso analyzed and simulated that the caculation of the inductorcurrent ripple and the output voltage ripple and the determination of the circuit elements of the output filter which play the key role for the whole performance of a inverter. Under multi-loop control structure, it also presents the estimation and selection of the bandwidth and sampling frequency for the current inner loop and voltage outer loop. The behavior of the closed-loop controlled PWM inverter has been simulated by using Matlab software and the effectiveness of the suggesed method was verified by experiment results using a DSP based digital control board.