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研究生:呂紹新
研究生(外文):Shao-hsin Lu
論文名稱:降壓型轉換器之控制在市電併聯型光伏系統
論文名稱(外文):Control of Buck Converter in Grid Connected Photovoltaic System
指導教授:魏慶隆
指導教授(外文):Chin-Long Wey
學位類別:碩士
校院名稱:國立中央大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:59
中文關鍵詞:最大功率點追蹤光伏系統電流源變流器
外文關鍵詞:maximum power point trackingphotovoltaic systemcurrent source inverter
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本文旨在探討市電併聯型光伏系統之設計且提出一最大功率演算法適用於前級轉換器控制電路並輸出交流電流滿足一般用電功率。在光伏系統中,前級採用降壓型轉換器,符合降壓升流,提高後級電流源變流器輸入電流的大小,並且針對兩倍瞬時功率的影響,傳統上使用電解電容來隔離交流訊號,本文於降壓型轉換器控制採用不同架構有效隔離交流市電的擾動,且減小電解電容的大小,使太陽能板維持穩定的輸出。後級採用電流源變流器,可以免除交流電流受輸出端交流市電的限制同時不用考量因為電壓源變流器為避免開關同時導通的空白時間設計。電流源變流器雖然控制簡單,但必須解決輸入電流源兩倍基頻諧波的問題,利用調整脈波寬度調變訊號以抵銷諧波訊號使輸出交流電流無低頻諧波。本文針對降壓型轉換器控制架構提出一最大功率演算法,有效達到最大功率點追蹤,使太陽能板維持最大功率輸出供後級電流源變流器轉換成交流電流。
This study presents a grid-connected photovoltaic system which is comprised of two stages: Buck DC/DC Converter and Current Source Inverter (CSI). The converter is used to buck the voltage and boost the current and provides a stable input power to the next stage. Conventionally, the electrolytic capacitor is used to isolate the disturbance caused by the ac output signals. The proposed control mechanism to the converter achieves an effective isolation from the grid-connected system, and also significantly reduces the size of electrolytic capacitor, so that the photovoltaic system provides a stable output. On the other hand, the CSI implements the inverter stage with a simpler control mechanism and has the inherent short circuit protection and the rapidness in system control. This study also proposes a simple way to obtain a reference voltage which makes sure the photovoltaic array to operate at the maximum power point.
摘要
ABSTRACT
致謝
目錄
圖目錄
表目錄
第一章 緒論
1.1 研究背景與動機
1.2 論文大綱
第二章 太陽能板特性與最大功率追蹤技術
2.1 太陽能板特性
2.2 太陽能模組等效電路
2.3 最大功率追蹤技術
2.3.1 擾動觀察法
2.3.2 增量電導法
2.3.3 定電壓法
2.3.4 開路電壓法
2.3.5 短路電流法
2.3.6 溫度量測法
第三章 太陽能轉換系統架構
3.1 降壓型直流/直流轉換器
3.2 電流源直流/交流變流器
3.3 脈波寬度調變切換技術
3.3.1 正弦脈波寬度調變
第四章 系統控制分析
4.1 降壓型轉換器控制
4.1.1 太陽能板輸出電壓漣波影響
4.1.2 兩倍瞬時功率
4.1.3 最大功率追蹤控制電路
4.1.4 降壓式轉換器模擬分析
4.2 電流源變流器控制分析
4.2.1 諧波抑制方法
4.2.2 主動非線性調變技術
4.2.3 總諧波失真與功率因數
4.2.4 功率因數修正
4.2.5 參考電流值
4.2.6 電流源變流器模擬分析
第五章 最大功率追蹤基於溫度量測
5.1 溫度量測最大功率追蹤
5.2 短路電流控制最大功率追蹤
5.3 溫度與短路電流控制最大功率點追蹤
5.4 系統模擬分析
第六章 結論
6.1 結論
6.2 未來研究方向
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