基於減緩全球暖化與永續發展之目標，各國積極發展再生能源，台灣亦於近幾年大力推動再生能源，我國預期目標於2025年再生能源裝置容量達到太陽光電20GW、風力發電包含陸上加離岸共6.7GW，再生能源年總發電量將占年總發電量20%，以取代核能發電占比，在大量再生能源併入電網之下，對電網將會產生許多的影響與改變。再生能源的間歇性、不易預測性是再生能源併網與電力調度的最大挑戰，輕者會導致系統頻率不穩定、區域電網電壓變動過大；嚴重時可能導致輸電線路壅塞、區域電網電壓不穩定。台灣未來風力發電及太陽光電將集中於中南部區域，可能造成區域間電力傳輸量增加，產生電力系統穩定度問題，因此需進行持續性研究分析，以因應未來台灣電力系統可能面臨之挑戰。
本文使用一獨立電力系統作為分析案例，加入高占比再生能源後，考量地理分布不均因素，使用PSS/E(Power System Simulator for Engineeing)電力系統模擬軟體進行模擬，對於電力潮流、電壓變動、短路事故下之暫態穩定度與頻率驟降事件(包含機組跳脫事故和太陽光電發電量變動事件)等項目進行探討分析，最後對於頻率驟降事件，考量加入包含儲能系統之輔助服務後，對於系統頻率之改善程度進行模擬分析。

To slow down global warming, the world develop renewable energy actively. Taiwan has also promoted renewable energy in recent years. The target of renewable energy installations are 20GW of solar and 6.7GW of wind power by 2025. The total annual power generation of renewable energy will account for 20% of the total annual power generation to replace the proportion of nuclear power generation. When a large amount of renewable energy is integrated into the power grid, the grid will have many impacts and changes. The intermittent and unpredictable nature of renewable energy is the biggest challenge to power dispatching. The lightest will cause system frequency instability and regional grid voltage fluctuations; in severe cases, it may cause transmission line congestion and regional grid voltage instability. The wind power and photovoltaics will be concentrated in the southwest region of Taiwan in the future. Therefore, continuous research and analysis are needed to meet the future challenges of Taiwan power system.
In this paper, an independent power system is used as an analysis case. After adding a high proportion of renewable energy, considering the uneven distribution of geography, PSS/E is used to simulate the power flow, voltage fluctuation, Transient stability and frequency sag events are discussed and analyzed. Finally, this paper simulate and analyze the improvement of the system frequency after considering the inclusion of auxiliary services including energy storage systems.

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