研究生: |
路光豪 GUAHG-HAO LU |
---|---|
論文名稱: |
混合供電LED路燈系統之研製 Study and Implementation of an LED Street Light System with Hybrid Power Sources |
指導教授: |
羅有綱
Yu-Kang Lo 邱煌仁 Huang-Jen Chiu |
口試委員: |
林景源
none 林忠義 none |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 144 |
中文關鍵詞: | 混合供電 、最大功率追蹤 、蓄電池 、市電併聯 、耦合電感SEPIC轉換器 |
外文關鍵詞: | Hybrid power sources, Maximum power point tracking, AC grid, Battery, Coupled-inductor SEPIC converter |
相關次數: | 點閱:375 下載:18 |
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本論文所研究之混合供電LED路燈系統,改善了一般獨立型太陽光電能系統容易受環境影響,造成電力品質不穩定之缺點;也無市電併聯型系統有孤島效應之缺點,不用額外設計孤島效應偵測及保護機制,有效降低電路體積與成本。其優點還包含具有低電池後續保養維護成本、高可靠度電力品質、高功率密度、簡單電路、高功率因數等。實際完成的LED路燈系統內含輔助電源及散熱風道,為一符合國際發展趨勢的再生能源應用系統。
本系統以昇壓型轉換器當作太陽能充電器,於日間充電模式時在不斷變化之環境下,透過擾動觀察法可精準追蹤至最大功率點,並透過多階段能源管理策略,使太陽能模組產出之電能與蓄電池壽命能得到最佳化處理。夜間放電模式時,電池端使用降壓型轉換器當作LED驅動器,並根據不同之負載狀況自動切換定電壓/定電流模式,以保護LED路燈負載。為了防止蓄電池過度放電,採用市電併聯供電之LED驅動電路,選用架構為單級耦合電感SEPIC轉換器,此電路具有單級轉換、高功因、零電流切換、電路簡單、輸入EMI濾波器容易設計等優點,且同時具有功率因數修正及驅動LED負載的功能。
This thesis is related to an LED street light system with hybrid power sources. From this research, we can improve the unstable electric power quality, caused by external environmental factors, in a stand-alone photovoltaic (PV) system. There is no islanding problem as in a grid-connected PV system. No additional detection and protection circuits are required, therefore, cost and volume can be effectively reduced. There are more advantages, such as lower battery maintenance cost, highly reliable power quality, high power density, simple circuit, high power factor…etc. The implemented LED street light system includes auxiliary power and cooling device, which is a renewable energy application meeting the international trend.
This system uses a boost converter as a PV charger. When it operates under charge mode during the day, it can accurately track the maximum power point by P&O method. The three-stage energy management can optimize the solar panels’ output power and battery lifetime. On the other hand, when it operates under discharge mode during the night, a buck converter is used as an LED driver. Depending on the load condition, constant voltage or constant current mode can be switched automatically to protect the LED lamp load. To prevent the battery from being over-discharged, this system uses an additional LED driver circuit supplied from the AC grid. It is a single-stage coupled-inductor SEPIC converter featuring high power factor, zero current switching, simple circuit without EMI filter.
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