Fault Diagnosis Strategy for Solar Cells Based on Reverse Derivation of I-V Curve

Abstract This paper proposes a fault diagnosis strategy for solar cells based on the reverse derivation of the I-V curve. This strategy does not require real-time monitoring of the surface irradiance and average temperature of the solar cell during operation. It only needs to calculate(establish) the I-V curve library under different irradiance and solar cell temperature in advance, then measure the open circuit voltage and short circuit current of the photovoltaic module during operation. And the measured voltage and current at the maximum power point can determine whether the solar cell is faulty. The possible faults of various solar cells are simulated by setting up experimental equipment, and the method is used for fault diagnosis. Experimental results show that the proposed method can effectively monitor various faults of solar cells. The method improves the accuracy of fault detection of the solar cell, enhances the reliability and economical benefits of the photovoltaic power station, and realizes online fault detection of the solar cell.