地球暖化的溫室效應與石化燃料的日益枯竭，促使世界各國朝向再生能源發電技術發展，太陽光電系統是主要發展項目之一，其所帶來的安全問題亦引發重視。太陽光電系統含括直流電力系統，電路中有發生直流串聯電弧故障的可能性，此型態之故障，其線路電流不增反減，因此傳統過電流保護設備並無法隔離此種故障，串聯電弧伴隨高熱，若持續時間過久，會導致嚴重的火災事故，因此，國際上均有針對太陽光電系統制訂電弧故障保護之要求。
本文利用48.83 kHz ~ 93.99 kHz高頻電流雜訊含量，於串聯電弧故障發生後明顯高於故障前之特性，將此頻段電流訊號進行快速傅立葉轉換，利用轉換結果進行運算分析及判斷，並建立一套故障偵測方法。依據此偵測方法設計一可判別太陽光電直流串聯電弧故障之偵測器，並採用以多晶矽太陽光電模組串接而成之市電併網型系統作為實驗平台，於不同運轉條件下測試新設計之偵測器，並與兩款商用偵測器進行比較。結果顯示，新設計之偵測器與兩款商用偵測器，皆能完全準確偵測太陽光電直流串聯電弧故障，但其中一款商用偵測器因遮蔭效應所導致之劇烈電流變化而有誤動作情形。

To deal with problems such as global energy shortage and climate changes caused by the greenhouse effect, distributed generation techniques on renewable power energies are under development by many countries. One of the most important renewable power energies is the PV systems. However, there are some safety issues about PV systems which need to be addressed. PV systems contain DC power systems. DC arc fault may present in DC power systems. In a DC series arc fault, the post-fault current is even smaller so this kind of fault couldn’t be isolated by conventional overcurrent protection devices. The arcing accompanied with high thermal. If arcing last long, it may cause a serious fire event. Thus, many countries have developed code about arcing fault protection.
In this thesis, the current noise between 48.83 kHz ~ 93.99 kHz which contains a characteristic that post-fault magnitude of noise current is bigger than pre-fault. The current noise is converted by Fast Fourier Transform (FFT). Analyze the result of FFT and propose a series arc fault detecting method.
According to this detecting method, a DC series arc fault detector for PV systems is implemented and an experiment platform is constructed by grid connected PV systems. The grid connected PV systems are constructed by Ploy Silicon panels connected serially. The proposed detector is tested in different kinds of condition and compared with two commercial detectors in experiment platform. According to the test result, the proposed detector and two commercial detectors can detect series arc fault with 100% accuracy but one of the commercial detectors have false actions when system current changed drastically by shading effect.

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