本論文旨在探究系統在採行「同相供電」模式下之故障電流與保護協調問題及提出可行之同相供電應用設計。首先，蒐整相關文獻與技術資料、探討各國配電系統架構與卸載策略，再藉以研析同相供電之學理、方法及其特性與功能。續之，應用Matlab/Simulink建構配電系統主要元件之數學模型與功能方塊，並進行配電系統在「正常供電」與「同相供電」兩種操作模式下運作時之系統電力潮流與故障電流之模擬與分析及差異檢討。研究結果除驗證「同相供電」確可在系統供電能力不足或發生緊急事故時，大規模卸除耗電量較大之電力負載，但持續供電給耗電量較小之重要負載；同時也證明在前揭兩種供電模式下之故障電流大小差異不大，並藉此探討在「同相供電」模式下之保護協調問題，俾供應用設計時參考。最後，本論文提出可使用戶重要負載在不完全斷電情況下切換為同相供電模式之設計方法與應用範例。本論文所提方法與技術亦可應用於微電網與智慧建築系統中，研究成果有助於加速同相供電的落實應用，有效紓解分區輪流停電所造成的不便與衝擊。

The major purpose of this dissertation is to examine the short-circuit current and protection coordination scheme under “same-phase power supply” operation mode and to propose a feasible application design of same-phase power supply scheme. Firstly, the relevant literature and technical data are collected, and the distribution system architecture and load shedding strategy of various country are explored. The theory, methods, characteristics, and functions of the same-phase power supply scheme are investigated as well. Then, the mathematical models and function blocks for the major components of the power distribution systems are constructed by Matlab/Simulink. The power flows and short-circuit currents are simulated, analyzed and examined under the “normal” and “same-phase” power supply operation modes. The simulation results verify that the “same-phase power supply scheme” not only can widely shed loads with large power consumptions under the system power shortage or emergency but also can continue supplying power to the essential loads with low power consumptions. Meanwhile, for reference of application design, it also proves that the difference between the short-circuit currents under the “normal” and “same-phase” power supply modes is insignificant, and the protection coordination under the “same-phase power supply” mode is explored. Finally, an application design technique and example are proposed to switch operation mode from the “normal” to “same-phase” power supply mode without interrupting the critical loads. The proposed methods and techniques can also be applied to microgrids and smart buildings. The research outcomes of this dissertation are of value to accelerate the implementation of same-phase power supply scheme and then effectively relieve the inconvenience and impact caused by the “power cut-off alternately by districts”.

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