Device and method used in photovoltaic power plant for monitoring and suppressing potential induced degradation effect

Abstract

The invention provides a device used in a photovoltaic power plant for monitoring and suppressing a potential induced degradation (PID) effect. The photovoltaic power plant comprises a photovoltaic module string and a battery module. The device comprises a charge control module, a discharge control module, a data acquisition module, a clock module and a control operation and processing module, wherein the charge control module is used for controlling the photovoltaic module string to charge the battery module; the discharge control module is used for controlling the battery module to apply an inverse voltage to the photovoltaic module string when the PID effect occurs; the data acquisition module is used for acquiring voltage data of the photovoltaic module string and electric quantity condition of the battery module; the clock module is used for acquiring current time of a system; and the control operation and processing module is used for performing analytical processing according to the data acquired by the data acquisition module and the clock module, and further controlling the start-stop operations of the charge control module and the discharge control module. The invention further provides a method used in the photovoltaic power plant for monitoring and suppressing the PID effect. The device has the advantages of being simple in structure, small in size, low in cost, and capable of performing effective monitoring and suppressing on the PID effect of the photovoltaic power plant.

Description

technical field [0001] The invention relates to a device for monitoring and suppressing the potential-induced attenuation effect used in a photovoltaic power station and a testing method thereof, belonging to the technical field of new energy utilization. Background technique [0002] With the development of new energy, photovoltaic power generation systems have been widely used, but some photovoltaic power plants will experience a significant decline in power generation after 3 to 4 years of operation or even a shorter period of time, especially in areas with high temperature and high humidity. obvious. [0003] Potential-induced decay (PID) was first discovered by Sunpower in 2005. PID refers to the leakage current between the glass and the packaging material under the long-term high voltage, resulting in the performance of the component being lower than the design standard. American Renewable Energy Laboratory and Solon Corporation have found that PID phenomenon exists ...

AI Technical Summary

Problems solved by technology

At present, there is no relevant public literature on the use of devices capable of monitoring and suppressing PID effects on strings in photovoltaic power plants, and there are no such products on the market

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