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PV Module PID Phenomenon

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PV Module PID Phenomenon
PV Module PID Phenomenon
PID(Potential Induced Degradation), is meaning as the potential-induced attenuation effect, PV modules’ PID performance is generally refers to those photovoltaic modules which have been under negative bias for a long time in high temperature and high humidity environment, and have surface passivation due to leakage current, that cause the filling factor (FF) , short-circuit current (Isc) and open-circuit voltage (Voc) decrease, and the output power of the module is greatly decreased. As early 21st century, oversea PV module manufacturers found that the actual power generated by PV power plants is far from the theoretical power. After investigation and analysis, the PID theory was put forward. Later, the PID phenomenon on causes and detection methods have been improved after analysis and demonstration of the main research institutions in the world.

Reason for PID: As shown in figure 1, PV module is connected to inverter, and the module which closest to the inverter bears the maximum ground voltage, with a positive UIN / 2 and a negative Uin / 2. 
Because of the potential voltage difference between module and the Earth, metal border of the module is grounded, there will be a potential difference between the module battery and the border, which will create a leakage current.

The ion mobility accelerates with humidity, temperature and voltage potential. Tests have revealed the relationship of mobility to temperature and humidity: “Planar contact with the panel surface also causes a capacitive coupling to the cells, resulting in a capacitive leakage current of varying strength.”
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