本文提出以全釩氧化還原液流電池及超級電容器儲能設備所組成之混合式儲能系統，對於併網型混合再生能源系統進行穩定度改善分析。研究系統是由風場與太陽能場所組成的混合再生能源系統連接到IEEE 14匯流排多機電力系統。本論文使用機率方法決定混合式儲能系統之額定功率規格，並設計全釩氧化還原液流電池及超級電容器之容量分配，以有效利用兩個儲能設備的特性，文中也提出了基於混合式儲能系統的控制方案，俾降低全釩氧化還原液流電池的壓力與平滑再生能源的功率波動。在穩態及小信號穩定度研究方面，分別對所研究系統的不同案例進行比較，於動態與暫態研究方面，分析系統在不同擾動條件下的模擬結果，以比較所提出混合式儲能系統對所研究系統在平滑傳輸電力及穩定度改善方面之效果。

This thesis proposes stability-improvement analysis of grid-connected hybrid renewable-energy systems using a hybrid energy storage system consisting of a vanadium redox flow battery and a supercapacitor energy-storage unit. The studied system is a hybrid wind-PV farm connected to the IEEE 14-bus multi-machine power system. A probability approach is used to determine the rated power specification for the hybrid energy-storage system, while the capacities of the vanadium redox flow battery and supercapacitor are designed to effectivily utilize their characteristics. The control scheme based on a hybrid energy-storage system is proposed to reduce the pressure of the vanadium redox flow battery and smooth output power fluctuations of the renewable-energy systems. For steady-state and small-signal stability studies, different cases of the studied system are compared. Dynamic and transient time-domain simulations subject to different disturbance conditions are also analyzed. The simulation results show that the proposed hybrid energy-storage system can improve stability and power-smoothing performance of the studied system.

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