近幾年來，直流/交流轉換器被廣泛的應用在許多方面。隨著直流/交流轉換器的普及，其可靠度也就更加的重要。降低故障狀態對系統的影響，則可以有效提高直流/交流轉換器系統的可靠度。藉由了解轉換器系統故障類型與故障模式，有助於設計直流/交流轉換器之保護策略。本文所提出直流/交流轉換器保護策略，是將轉換器可能遭遇到的故障類型如：電源端單相接地故障、整流二極體短路故障、直流匯流排接地故障、直流匯流排短路故障、開關元件短路故障、負載端之線間短路故障及負載端之單相接地故障等加以分析，並針對故障模式及故障電流路徑，提出適合的保護策略，減輕故障對轉換器的傷害。直流/交流轉換器保護策略如下所述：無熔絲開關(NFB, No Fuse Breaker)、電磁接觸器(magnetic contactor)、保險絲(fuse)及突波吸收器(MOV, Metal Oxide Varistor)，並且在直流匯流排 (dc bus)偵測直流電壓及電流，提供過電壓、欠電壓與過電流之保護，反流器輸出端利用電流偵測器(current sensor)設計過電流保護。本文將以電腦模擬及實際電路實驗結果，驗證所提之直流/交流轉換器系統保護策略，論文內容為緒論、文獻回顧、操作原理、模擬結果與分析、實驗結果與分析以及結論等六個章節，詳細說明反流器保護策略之動作原理與整體性能。

Recently, the DC-to-AC converters are widely used in many applications. With popularization of the direct DC-to-AC converter, its reliability becomes even more important as well. Reducing the influence on the system of the fault state can effectively improve the reliability of DC-to-AC converter system. In addition, it is good for the protection schemes for DC-to-AC converter by understanding the fault type and fault state of the converter system.

The protection schemes for DC-to-AC converter proposed by this research paper are to analyze the fault modes that converters may meet. For instance: Input supply single line to ground fault, Rectifier diode short-circuit fault, Earth fault on dc bus, DC bus capacitor short-circuit fault, Transistor short-circuit fault, Line to line short-circuit at inverter load and Single line to ground fault at inverter load. Direct against the fault type and fault current circuit, put forward the suitable protection schemes, the injury to the converters that lighten the fault. The protection schemes are as the following: NFB (No Fuse Breaker), magnetic contactor, fuse, varistor, DC bus over/ under voltage protection, DC bus over current protection and AC over current protection.

The proposed protection schemes in the thesis will be presented and analyzed by computer simulation and laboratory experiment. The research paper, which elaborates the theory and integral functions of protection schemes of inverter, is divided into six chapters, including preface, bibliography, operation principles, results and analysis of simulation and experiments and the conclusion

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