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http://dx.doi.org/10.7836/kses.2015.35.5.057

PID Recovery Characteristics of Photovoltaic Modules in Various Environmental Conditions  

Lee, Eun-Suk (Photovoltaic Laboratory, Korea Institute of Energy Research, Graduate School of Energy Science and Technology, Chungnam National University)
Jung, Tea-Hee (Photovoltaic Laboratory, Korea Institute of Energy Research)
Go, Seok-Hwan (Photovoltaic Laboratory, Korea Institute of Energy Research)
Ju, Young-Chul (Photovoltaic Laboratory, Korea Institute of Energy Research)
Chang, Hyo Sik (Graduate School of Energy Science and Technology, Chungnam National University)
Kang, Gi-Hwan (Photovoltaic Laboratory, Korea Institute of Energy Research)
Publication Information
Journal of the Korean Solar Energy Society / v.35, no.5, 2015 , pp. 57-65 More about this Journal
Abstract
The Potential Induced Degradation(PID) in PV module mainly affected by various performance conditions such as a potential difference between solar cell and frame, ambient temperature and relative humidity. The positive charges as sodium ions in front glass reach solar cell in module by a potential difference and are accumulated in the solar cell. The ions accelerate the recombination of generation electrons within solar cell under illumination, which reduces the entire output of module. Recently, it was generally known that PID generation is suppressed by controlling the thickness of SiNx AR coating layer on solar cell or using Sodium-free glass and high resistivity encapsulant. However, recovery effects for module with PID are required, because those methods permanently prevent generating PID of module. PID recovery method that voltage reversely applies between solar cell and frame contract to PID generation begins to receive attention. In this paper, PID recovery tests by using voltage under various outdoor conditions as humidity, temperature, voltage are conducted to effectively mitigate PID in module. We confirm that this recovery method perfectly eliminates PID of solar cell according to repeative PID generation and recovery as well as the applied voltage of three factors mainly affect PID recovery.
Keywords
PID(Potential Induced Degradation); PID Recovery; Encapsulation Materials; Potential Difference;
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