本論文係將離岸式風場、潮汐場及沿岸波浪場等混合式再生能源系統以聚集等效之方式整合，並透過高壓直流傳輸系統與電網端做連接。在本論文中所用之各發電系統交直軸等效數學模型是假設系統於三相平衡條件下所推導，並利用所推導之數學模型分別進行系統頻域之穩態特徵値以及時域動態特性分析。文中並以極點安置法設計高壓直流傳輸系統之比例-積分-微分阻尼控制器，並將該控制器加入該混合式再生能源系統中，分析比較加入所設計阻尼控制器前後之穩態及動態響應。由其模擬結果可知，當高壓直流傳輸系統加入比例-積分-微分阻尼控制器後可做功率潮流控制，並有效改善系統遭受干擾時之穩定度特性，提升系統阻尼響應。

This thesis presents the research results of stability improvement and power flow control of a hybrid renewable-energy power-generation system including an equivalent aggregated offshore wind farm, a tidal current farm, and a wave energy farm connected to power grid through a high-voltage direct-current (HVDC) link. The q-d axis equivalent mathematical model is developed under three-phase balanced loading conditions to establish the complete model of the studied system. Pole assignment approach is used to design a proportional-integral-derivative (PID) damping controller for the HVDC system. Steady-state characteristics of the studied system under various operating conditions using eigen scheme are performed. Time-domain simulations of the studied system subject to disturbance conditions are also carried out. It can be concluded from the steady-state and dynamic simulation results of the studied system that the proposed HVDC joined with the designed PID damping controller is capable of controlling power flow and improving stability of the studied system under various disturbance conditions.

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