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The first step in automatic supervision, condition monitoring and fault detection of photovoltaic system is recognition, exploration and classification of all possible faults that maybe happen in the system. This paper aims to perceive, classified, simulate and discus all electrical faults in DC side of photovoltaic system, regarding electrical voltage and current inspections. For that, simplified hybrid model of photovoltaic panel in MATLAB environment is used. Investigation and classification of each type of faults is down and the effects of the faults are illustrated in this paper. Flash test are applied to improved electrical model. Current-Voltage curves signature are interpreted and investigated in simulation environment.

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The homeowners PV system want to maximize the total energy harvesting from their installed resident PV system (RPS), especially if there is a feed-in tariff (FIT) in play. In this regard, fault detection in solar photovoltaic (PV) arrays allows to expedite PV system recovery time. On the other hand, one of the most common fault in RPS is partial shading and fault diagnosis effort and interpreting this type of fault is motivated us to propose this paper. I-V curve of shaded string included notched and steeped points which are related to signature of shaded cells. In fact, the value of the vertical height in I-V curve represented of percentage of shading. Likewise, the horizontal or voltage distance from Voc of the notched point is related to the number of cells strings within modules those have been bypassed by diodes (Number of bypassed modules). In this work, for first time discrete wavelet transform (dwt) is used to interpret traced I-V curve of PV system and defining these coordinated points in related diagnosis effort.

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