Abstract
Potentially induced degradation (PID) faults in crystalline silicon photovoltaic modules are a well-known problem. Traditional detection methods are time-consuming and expensive. In order to quickly detect the PID PV modules online, we investigate and collect the PID PV modules in several large PV power plants. The I-V characteristics of the PID modules are tested. The test results show that the open circuit voltage of PID modules has a significantly decline than that of the normal modules. In addition, the open circuit voltage has a large difference under high and low irradiance, and the reason of this feature is analyzed. A method for online diagnosis of PV module PID faults through I-V curve is proposed, and it has been verified that the method is effective for PID faults.
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