本論文係以四種海流發電架構，分別為：海流感應發電機直接併聯市電、海流感應發電機經電力電子轉換器併聯市電、海流感應發電機自激發電連接獨立負載以及海流感應發電機自激發電經電力電子轉換器連接獨立負載，利用此四種海流發電架構研究系統之穩定度、穩態及動態響應。在三相平衡系統下採用交直軸等效電路模型，分別建立海流流速、海流渦輪機、感應發電機以及整流-換流模組等之模型，並推導其數學模型來完成整體動態方程式。在穩態方面，則分別對不同海流流速、控制命令值以及相關參數變動對系統特性之影響做詳細討論。在動態研究方面，完成變動流速、市電端三相短路故障、變動控制命令值、負載切換、轉矩干擾以及相關參數變動之模擬。最後在轉矩干擾下，利用模糊控制器來改善直流鏈電壓之暫態響應。

This thesis presents stability analysis, steady-state results, and dynamic performance of marine-current power generation systems under four configurations, i.e., marine-current induction generator (MCIG) directly connected to the grid, MCIG connected to the gird through power-electronic converters (PECs), marine-current self-excited induction generator (MCSEIG) directly connected to isolated loads, and MCSEIG connected to isolated loads through PECs. The d-q axis equivalent-circuit model is employed to establish the models for marine-current turbine (MCT), MCIG, and PECs to derive the complete dynamic equations of the studied system under three-phase balanced loading conditions. Steady-state characteristics of the studied system under different marine-current speeds, various control commands, and various parameters are examined. Dynamic simulations of the studied system subject to variable values of marine-current speed, voltage drop at utility grid, control command, loads, torque disturbance, and system paramerters are also carried out. Also, fuzzy logic control(FLC) controller is employed to improve the dynamic response of dclink voltage under torgue disturbance.

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