現在智慧電網的發展已經成為一種國際趨勢。由於傳統的機械式斷路器切斷電流時間過長，直流微電網上的元件將會在短路故障發生時承受過大的電流而毀損。
本論文中提出一個輸入電壓為500V的固態斷路器的原型設計，利用控制開關數量來完成不同額定電流的固態斷路器，額定的電流分別為50A、100A、150A以及200A。並採用數位信號處理器控制固態斷路器，達成偵測故障電流並進行限流保護以及偵測故障電流上升率，從而完成可在5 μs~ 10μs範圍內的延遲時間保護。

The development of smart grid has become an international trend. The trip time for the conventional mechanical circuit breaker is too long, and the components on the DC micro grid will withstand excessive current and be damaged when short-circuit fault occurs.
In this thesis, a prototype of a solid-state circuit breaker with an input voltage of 500V is proposed. The number of switches is used to achieve solid-state breaker with different rated currents, including 50A, 100A, 150A and 200A. A digital signal processor is used to control the solid-state circuit breaker to achieve fault current detection and current limiting protection as well as fault current rising rate detection to complete different delay time protection in the range of 5 μs~ 10μs.

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