2019-08-17
PID effect of photovoltaic modules shared by photovoltaic system design company.
With the continuous development of the photovoltaic industry, photovoltaic power stations are applied from desolate gobi desert to sunny inland and coastal cities, and the difference in application environment leads to the difference in the power generation efficiency of photovoltaic power stations. The FID effect of components, as one of the important factors affecting power generation, has been widely concerned by the industry.
With the continuous development of the photovoltaic industry, photovoltaic power stations are applied from the desolate gobi desert to the sunny inland and coastal cities. Different application environments cause differences in the efficiency of photovoltaic power stations. As one of the important factors affecting the power generation of power stations, the PID effect of components has been widely concerned by the industry. What are the causes and hazards of Photovoltaic PID effect? What is the most reliable way to suppress the PID effect?
1. Who are the dangerous passengers of PID effect?
PID effect (Potential Induced Dezradation), also known as electric Potential Induced attenuation, is battery components encapsulation material and its surface and the surface material, between cell and its grounding metal frame under the action of high voltage from the migration, performance attenuation phenomenon caused by the component. The component parameters of PID effect before and after the test and contrast IV curve 0 # (tag). By comparing the clear effect of PID huge influence on the output power of solar battery components. Photovoltaic power generation is a "terrorist killer".
Photovoltaic PID
2. Why does PID effect occur?
The results of photovoltaic module manufacturers and research institutions show that Solar PID Issue is closely related to module composition, packaging materials, ambient temperature, humidity and voltage.
Composition of solar cell modules
The solar cell module is composed of glass +EVA+ cells +EVA+TPT+ frame.
2) the process of PID effect
There are different opinions on the real causes of PID effect on components, and the typical explanations are as follows:
(1) water vapor is easily generated in the humid and high temperature environment, and water vegetable gas can enter into the inner part of the components through sealing edge silica gel or backboard;
(2) the ester bond of EVA reacts with water to form freely movable acetic acid.
(3) the reaction of acetic acid and soda (Na2C03) in the glass will precipitate N and move it to the surface of the battery under the action of electric field inside the battery, resulting in reduced vitreous resistance.
