Power attenuation recovery method of solar component

Abstract

The invention relates to a power attenuation recovery method of a solar component. The solar component is formed by connecting n cells, wherein n is not less than 4; (1) a positive pole of the first cell of the solar component is led out for being used as an A+ end, a negative pole of the n / 2th integral cell of the solar component is led out for being used as an A- end, the positive pole of the n / 2+1th integral cell of the solar component is led out for being used as a B+ end, and an electrode of the nth cell of the solar component is led out for being used as a B- end; (2) during normal working, the A- end and the B+ end are in short-circuit connection, the A+ end is taken as a positive pole output end of the solar component, and the B- end is taken as a negative pole output end of the solar component; and (3) when power attenuation recovery needs to be performed on the solar component, the A+ end and the B- end are in short circuit connection, the A- end is taken as the negative pole output end of the solar component, and the B+ end is taken as the positive pole output end of the solar component. According to the power attenuation recovery method disclosed by the invention, the power attenuation recovery of the solar component can be realized.

Description

technical field [0001] The invention relates to a power attenuation recovery method of a solar module. Background technique [0002] The phenomenon of PID (Potential Induced Degradation) or surface polarization (surface polarization) is currently used in the photovoltaic industry. Cause power attenuation, such as a few months or a year or two in a short period of time, there will be an abnormal and sharp decrease in power. [0003] In the early days, sunpower explained the unique surface polarization (surface polarization) phenomenon of the back electrode battery and the prevention method in the document "The Surface Polarization Effect in High-Efficiency Silicon Solar Cells". The battery in the module has a relatively high positive voltage to the ground. It is the most fundamental cause of its polarization phenomenon. Recently, solon company released its long-term research report on PID phenomenon "Potential Induced Degradation of solar cells and panels", which mainly exp...

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Problems solved by technology

[0004] Patents US2009\0260673, US2006\0196535 "preventing harmful polarization of solar cells" and CN101133500 "preventing harmful solar polarization" describe some ways to prevent polarization of components: 1. Adding A layer of porous silicon dioxide coating that forms a conductive circuit to prevent unwanted polarization, this method increases the cost of battery manufacturing and reduces the efficiency of the battery to some extent

2. Some solutions mainly recommended in the system such as 1) Use resistors to change the voltage of components in the system to ground; 2) Inverters with positive grounding modules and isolation transformers, this method makes the use of components have limitations and has isolation transformers , reduces the system efficiency

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