微電網泛指結合分散式電源與在地負載，且能獨立運轉的區域型電網。分散式電源與傳統集中式電源不同之處在於，其於機組數量多、分佈範圍廣、單機容量小、發電不穩定且缺乏旋轉電機慣性等特性。系統慣量不足將讓微電網因系統供需不平衡或短路故障等偶發事件，導致系統頻率的波動過劇，容易使分散式電源機組為自我保護而跳脫，進而擴大事故範圍。卸載為快速處理供需不平衡的解決方案之一。傳統卸載方案，利用預設之低頻閥值與參數執行卸載動作。但預設參數與微電網及時運轉情況難以完全符合，加上頻率響應的延遲特性，導致卸載量與實際需求量的不匹配，嚴重影響微電網維持其供電可靠度。因此，一套能隨微電網運轉狀態調整的自適應卸載策略是最好的選擇。
本文建置一套整合監視控制與資料擷取平台(Supervisory Control and Data Acqisition, SCADA)、IEC 61850及智慧電子裝置(IED)之微電網動態卸載技術。藉由應用SCADA透過IED經由IEC 61850通訊方式取得微電網即時發電用電及電網結構資訊，再參考匯流排之虛功率與電壓，依據虛功率與電壓特性曲線(QV Curve)，進行卸載優先度選擇並定期計算與更新其緊急卸載需求，以增加微電網運轉可靠度。為驗證微電網動態卸載技術之可行性，本文應用PSSE建立一微電網範例系統及其相應之SCADA與IEC 61850功能驗證平台，實際驗證IEC 61850準則之IED及SCADA通訊架構效能，再套用功能測試結果於不同模擬情境中，根據台灣電力公司之快速反應輔助服務要求，本文提出之微電網動態卸載技術，透過SCADA調度低頻卸載，皆能滿足規範要求。

Microgrid(MG) is a power grid which combines distributed power resource(DER) and local load and is capable to run in islanded mode. DER differs from conventional power resources such as larger number of units, distributed installation, smaller capacity, unstable generation and low rotating inertia etc. These characteristics make MGs become lack of system inertia. Declined inertia may cause a rapid change in MG’s frequency when a contingency like power imbalance or short circuit fault occurs. Underfrequency conditions could make a generator trip in the purpose of self-protecting and enlarge the area of blackout. Load-shedding is a solution can quickly resolve power imbalance. Conventional underfrequency load-shedding uses preset frequency pickup and parameters but these preset parameters can’t estimate the dynamic load-shedding demand in MGs. The delayed response of system frequency may change into a mismatch of load-shedding demand. Therefore, an dynamic load-shedding method which can adapt easily to the operating conditions is the best option for MGs.
This thesis proposes a dynamic Load-shedding method for MG which mainly included Supervisory Control and Data Acqisition(SCADA), IEC 61850 and Intelligent Electronic Device(IED). Utilizing SCADA to obtain the real-time information like generation, load and topology of a MG via IEC 61850 communication from IEDs. The proposed method sets prority of loads refers to QV curve and periodically updates contingency load-shedding demand. Aim to present the feasibility of the proposed method, This dissertation establishes a simulation of the MG and a corresponding communication testing platform. This dissertation certifies the performance of proposed method and use the result to simulate the in different condition.The proposed method satisfies the requirement of Fast Response Auxiliary Service made by Taiwan Power Company.

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