本論文提出以超級電容器及飛輪儲能設備所組成之混合式儲能系統用於整合雙饋式感應發電機風場與太陽能發電系統之穩定度研究。在三相平衡系統條件下，採用交直軸等效電路建立完整系統之數學模型，並探討再生能源加入超級電容器、飛輪儲能設備及混合式儲能系統前後四種案例進行比較。本論文在經濟分析方面，以淨現值、內部報酬率、簡易回收期間及益本比四項指標評估混合式儲能系統的經濟效益。在穩態研究方面，分別將四種案例於風速改變、光照度改變等工作條件進行電力潮流分析，並在小信號穩定度方面，利用根軌跡圖判斷不同情況下，對系統穩定度特性造成之影響。最後，於動態與暫態研究方面，分析風速與光照度變動、本地負載阻抗值瞬間改變及三相短路故障模擬結果，並比較系統加入儲能系統前後再生能源傳輸電力平滑及穩定度改善之情形。

This thesis presents stability analysis results of integrated doubly-fed induction generator-based wind farm and photovoltaic generation system with a hybrid energy storage system consisting of a supercapacitor and a flywheel energy storage unit. The d-q axis equivalent-circuit model is derived to establish the complete system model under three phase-balanced condition. Four cases of the studied system without energy storage system, with a supercapacitor, with a flywheel energy storage unit, and with a hybrid energy storage system are discussed and compared. For economic analysis, this thesis evaluates the economic benefits of the hybrid energy storage system based on four indicators: net present value, internal rate of return, simple payback time and benefit-cost ratio. For steady-state studies, the power flows of the four cases are analyzed under different operating conditions such as variations of wind speed and solar irradiance, etc. For small-signal stability analysis, the root-loci plots are used to investigate the system stability under different operating conditions. Dynamic and transient time-domain simulations of the studied systems subject to variable wind speeds and solar irradiances, local load changes, and three-phase short-circuit fault are also implemented. The simulation results show that the proposed hybrid energy storage system can offer better performance on power smoothing and stability of the studied system.

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