A solar cell and photovoltaic module series resistance imaging detection method and system

Abstract

The invention discloses a series resistor imaging detection method and system for a solar battery and a photovoltaic module. The detection system comprises a near infrared camera, a data collection card, a computer, a three-dimensional mobile station, a band-pass filtering sheet, lasers, beam shaping and beam expanding apparatuses, a non-inductive resistor and a relay. For overcoming the shortcomings of complex detection working procedures, long detection time, low signal to noise ratio, and operation in a dark room in the conventional photoluminescence method, series resistance imaging detection is performed on the solar battery and the photovoltaic module by combination with the photoluminescence and phase locking principle, without needing single short circuit state imaging; compared with the conventional photoluminescence method, one detection working procedure is reduced; meanwhile, by adoption of a phase locking algorithm, the advantages of high signal to noise ratio, no loss, visuality, large detection area, high efficiency and the like are achieved, without being influenced by the environment; and the series batteries imaging of the solar battery and the photovoltaic modulecan be detected by the natural light in day time and the light at night, so that the series resistor imaging detection method and system have potential application prospects in the field of photovoltaic.

Description

technical field [0001] The invention relates to a series resistance imaging detection method and system of solar cells and photovoltaic modules, which are suitable for detection and quantitative evaluation of uneven distribution of series resistance of solar cells and photovoltaic modules under natural light and dark room. Background technique [0002] In recent years, with the rapid development of the photovoltaic industry, the demand for solar cells and photovoltaic components has increased. At present, low-cost, high-efficiency solar cells and components are the ultimate goal of the photovoltaic industry. Series resistance seriously affects the fill factor of solar cells and thus limits the photoelectric conversion efficiency, so series resistance is of great significance for evaluating the performance of solar cells. Traditional detection methods include the I-V curve method, which can only obtain the overall series resistance of the battery or module. However, due to th...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the traditional photoluminescence method, such as complex detection process, long detection time, low signal-to-noise ratio, and operation in a dark room, the present invention provides a solar cell and photovoltaic module based on the phase-locked algorithm and the principle of photoluminescence detection. Series resistance imaging detection method and system

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