本文提出系統所受缺電量計算的估測法，並以此為基礎，擬定一套低頻卸載策略。此低頻卸載策略以減少用戶端非預期的卸載次數為優先，在策略中考慮了參與需量反應(Demand Response)的負載容量做為優先卸除之負載。在策略規劃過程中，以低階頻率響應模型為頻率響應分析工具，根據頻率響應分析結果，推論出系統缺電量大小估計原理，進而利用牛頓演算法估算頻率初始變化率以得到系統缺電量大小。估測出系統缺電量大小後，以此為依據規劃出系統的卸載策略。最後，利用系統發生擾動的案例模擬，驗證所提出卸載策略的有效性。模擬結果顯示，本文所提出之卸載策略對於系統常見的擾動事故，能有效降低因頻率驟降而導致非預期卸載事故的風險。

This thesis proposes a method of estimating the magnitude of system disturbance, upon which we establish a strategy for underfrequency load shedding considering the demand response. Given the objective to reduce time of unexpected load shedding of customers, the shedding of demand response is considered as the first priority in the underfrequency load shedding strategy. In the strategy plan process, a low-order frequency response model is taken as a reference model for system analysis. According to the frequency response analysis result, principles of the estimation on the magnitude of system disturbance are deduced. With the available estimate of the magnitude of system disturbance, a new load shedding scheme considering the demand response is proposed to protect frequency security. Simulation analyses showed that the propose load shedding strategy effectively maintain system frequency above the security level, which reduces the risk of unanticipated load shedding accidents.

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