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Detection of High-Impedance Line-Line Fault in Photovoltaic Arrays Based on Voltage Divider

High-impedance line-line fault in solar PV array with an active MPPT control is difficult to detect because of low fault current and similar output characteristics variations caused by external circumstances changes. PV system with undetected line-line fault may result in loss of energy and possess potential fire hazard. A detection method based on voltage divider is proposed in this paper. With two external resistors, the high-impedance line-line fault between two PV module strings can be found and located according to data measurement and processing. Experiment studies verify the accuracy and effectiveness of the proposed method.