Working state detection method for bypass diode of photovoltaic module wiring box

Abstract

The invention discloses a working state detection method for a bypass diode of a photovoltaic module wiring box. The method comprises the steps that voltage U1 and I1 of wiring ports connected to thepositive and negative sides of the normal photovoltaic module wiring box are tested, actual testing values of U1 and I1 are analyzed and compared with voltage output U0 and current output I0 of a normal photovoltaic module, and then whether or not the bypass diode in the photovoltaic module wiring box normally works is judged and the specific number of non-working bypass diodes is judged; a battery piece in parallel connection with the corresponding bypass diode is shielded, and meanwhile if output current I1 at the two ends of the wiring box is remarkably greatly reduced before and after shielding, the open circuit or breakdown exists in the bypass diode in parallel connection with the battery piece at the shielding position can be judged. The working state detection method is simple, effective, high in testing judgment reliability and easy to popularize, and the cost of judging the working state of the diode of the wiring box in the large-batch production process is low.

Description

technical field [0001] The invention relates to the technical field of photovoltaic module detection, in particular to a method for detecting the working state of a bypass diode of a junction box of a photovoltaic module. Background technique [0002] Because of its cleanness, safety, convenience, and high efficiency, solar photovoltaic power generation has become an emerging industry that is widely concerned and focused on development by countries all over the world. Therefore, in-depth research and utilization of solar energy resources is of great significance to alleviate the resource crisis and improve the ecological environment. [0003] According to the "China Photovoltaic Industry Development Roadmap (2016 Edition)", under the background of global warming and the depletion of fossil energy, the development and utilization of renewable energy is increasingly valued by the international community. It is predicted that by 2030, the cumulative installed capacity of photov...

AI Technical Summary

Problems solved by technology

[0005] At present, many modules produced by Chinese module manufacturers have many quality problems and hidden dangers, and a large part of the quality problems of modules come from the design and quality of the junction box itself, whether the bypass diodes in the photovoltaic junction box can work normally Will directly affect the efficiency of photovoltaic modules

[0006] During the process of installing the bypass diode into the junction box, the bypass diode is likely to be damaged in various forms such as thermal shock, mechanical stress, and electrostatic shock. Defective product, making it not work properly on PV modules

[0007] At present, there is no effective and feasible detection method to judge whether the bypass diode has failed before or during installation. In the mass production process, the damaged bypass diode can only be judged or replaced according to the actual use of the power station after the junction box is installed. In the actual operation process, it is impossible to intuitively judge the working status of the bypass diodes and determine the number and specific location of the damaged bypass diodes, which brings challenges to the product quality and reliability of the industrial production of photovoltaic modules.

Images