當風力發電占電力系統的總發電量達一定比例時，風機在系統故障發生時能否持續保持運轉，將會影響整體電力系統的發電量與供電量的平衡問題，利用低電壓忍受能力改善策略幫助風機度過故障時期，有助於提高系統的穩定度。本研究分析兩種改善風機的低電壓忍受能力的方法，包括利用旁路電路穩定直流匯流排電壓，以及利用虛功補償來減少電壓降幅度，比較改善方法對低電壓忍受能力曲線的影響。
本研究利用Digsilent軟體建立雙饋式風機與永磁式風機併聯電網的系統，模擬兩種風機技術遇到系統故障時的暫態響應特性，並應用兩種低電壓忍受能力改善方法，分別比較改善後的雙饋式風機與永磁式風機的響應特性。模擬結果顯示，應用風機的低電壓忍受能力改善策略有助於風機在遇到系統故障時減少其跳脫的可能，而且相同的改善策略應用到不同的風機技術上會有不同的改善效果。

When the wind power accounted for a total generating capacity reaches a certain percentage, wind turbine's ability to maintain operation during a fault will affect the overall balance of power system generation and electricity. Enhanced Low Voltage Ride Through (LVRT) measures can improve the stability of wind power generators and system. This study investigates the capability of two LVRT enhancement methods, i.e. the use of bypass circuits to stabilize the DC bus voltage, and a shunt Static Var Compensation (SVC) to raise terminal voltage and output power, in a simple network.
Digsilent PowerFactory software is used in this study to create two wind generator models, Doubly-Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) models. Transient responses during system faults with and without LVRT enhancement are compared. Simulation results show that the application of LVRT enhancement helps improve the wind turbine stability and the effectiveness of the control measures is different for different types of wind generators.

論文審定書i
誌謝ii
中文摘要iii
英文摘要iv
目錄v
圖次vii
表次xi

第一章 緒論1
1.1 研究背景與動機1
1.2 風力發電之技術發展與市場現況2
1.3 風力發電機之分類與簡介7
1.4 風力發電機對低電壓忍受能力相關文獻13
1.5 論文貢獻與架構28

第二章 風力發電機組之數學模型建立29
2.1 風力渦輪機原理與動態模型29
2.2 發電機運轉原理與動態模型38
2.3 旋轉座標系統下之等效數學模型46
2.4 轉換器原理、動態模型與控制策略53

第三章 風機低電壓忍受能力分析55
3.1 雙饋式感應風力發電機低電壓忍受能力分析55
3.2 永磁式同步風力發電機低電壓忍受能力分析58
3.3 以旁路電阻電路改善風機低電壓忍受能力63
3.4 靜態虛功補償器67

第四章 模擬結果分析與比較70
4.1 分析模式建立與模擬方法70
4.2 雙饋式感應風力發電機之低電壓忍受能力模擬79
4.3 永磁式同步風力發電機之低電壓忍受能力模擬90
4.4 低電壓忍受曲線比較99
4.5 分析結果討論110

第五章 結論與未來研究方向113
5.1 結論113
5.2 未來研究方向114

參考文獻116

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