目前台灣發展洋流發電所面臨的主要問題為黑潮流軸流經的海底深度過深、台灣東部海底地質堅硬，造成錨定困難度及成本皆高，以及洋流位置變動造成發電效率下降。本論文提出之橫向主動系泊式洋流發電系統將發電位置與錨定位置分離，藉此於追求發電量的同時降低錨定困難度。此外，發電機組可進行水平、垂直位置的移動，以追蹤洋流流軸與防颱。本論文亦提出一改良式重力錨定法，改善了重力錨的水平乘載容積(horizontal capacity)，減少錨定所需成本。
本論文提出之橫向主動系泊式洋流發電系統由纜繩、錨定物、發電機組及水翼組成。系統運作時，發電機組與水翼位於流軸中、錨定物位於陸地上或較淺的海底，三者之間以纜繩連接。水翼為一側躺在水裡的機翼，海流流過時便會形成一水平方向的升力，此升力透過纜繩將發電機組拉離錨定點，使發電位置與錨定位置分開。在水平方向上，海流作用在水翼及發電機組上的力與錨定物提供的錨定力達成平衡，使發電機組可維持在固定位置；在垂直方向上，系統的重量會以浮球來進行平衡。當水翼的攻角改變時，其上的升阻力也會隨之改變，進而影響到水平方向上的力平衡，使發電機組以錨定點為圓心移動至新的平衡位置，達到發電機組水平移動的功能。水翼上的副翼則可改變升力方向，將系統往海底拉，達到使系統改變垂直深度，進而預防受到颱風期間大浪所造成的損傷。本論文藉由建立分析模型來測試系統可行性。初步分析成果顯示，在適當的幾何設計下，本系統擁有足夠的水平移動能力進行流軸追蹤：移動距離較廣的長期變動中一年可追蹤三個季節、移動速度較快的短期變動中亦有足夠的速度即時追蹤流軸。
本論文提出之可移動的系泊式洋流發電系統適用於任何流經深海或是有位置變動的洋流，包含流經台灣及日本的黑潮以及流經美國佛羅里達的墨西哥灣暖流。

A new concept of Active Mooring of turbine generators for harvesting ocean current energy is proposed. The new active mooring system comprises a tether, an anchor system at one end of the tether and a Hydro Sail system at the other end of the tether. The anchor system is fixed to an anchorage either on the shore or on the seafloor. The Hydro Sail and most of the tether are immersed under water and maintained at neutral buoyancy. When sea current flows over the body of the Hydro Sail, a lift force is generated and pulls the tether in a direction away from the anchorage point. Thus, the dynamic lift force at one end and the fixation of the anchor system at the other end moor the tether in place. Power generating turbines, immersed and maintained at neutral buoyancy as well, can then be attached to the tether. By this Active Mooring system, the anchorage can be placed on shore or at a depth less challenge for marine engineering and the power generating turbines and the Hydro Sail, tethered, can float in the ocean current core that flows over deep seas. Therefore, installation costs can be reduced. Further, the system can adjust its horizontal position in the ocean by changing angle of attack of the Hydro Sail. This capability can be applied to actively track fast flows of the ocean current and increase power generation. The flaps system of the Hydro Sail also allows the system to adjust its vertical depth in the ocean. During storms or typhoons, the submerging depth of the whole system can increase in order to reduce wave effect. The system can potentially be applied to any current flow involving deep sea or varying flow tracks, including the Kuroshio Current near Taiwan and Japan, and the Gulf Stream near Florida.

Abstract I
摘要 III
Table of Contents V
List of Figures VI
List of Tables VIII
List of Symbols IX
1. Introduction
1.1 Motivation and Goal 1
1.2 Related Work 4
1.3 Characteristics of the Kuroshio Current and seabed east of Taiwan 7
1.4 Method of approach 19
2. Basic Concept of the Current Power System with Active Mooring 19
3. Preliminary Design and Analysis
3.1 Extent of horizontal displacement and angle of sway of the system 25
3.2 Cross stream deployment 36
3.3 Speed of motion of the system 40
3.4 Capacity improvement by “Tracking Fast Flows” 50
3.5 The tethers: loading, materials and drag reduction 52
3.6 Hydro-sail system 56
3.7 Anchoring 59
3.8 Overall system design and cost – initial result 64
4. Conclusion 67
Reference 71
Appendices 77
A1: Downwash effect
A2: Wire rope chart - 6x37 & 6x19, IWRC, EIPS rope
A3: Drag coefficients for 2D & 3D bodies
A4: Typhoon and waves

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