After the '531 New Deal', 'reducing costs and increasing efficiency, parity online' has gradually become the industry consensus, which further accelerates the development and application of new technologies for photovoltaic modules, while allowing some new reserve technologies and products to enter the market ahead of time, double-sided double-glass components. It is one of them.
'In the third batch of front-runner projects, double-sided double-glass components have become the new favorite of the target, accounting for about 2.6GW of total scalar quantity, accounting for 52%, and 4 of the technical leader's 3 bases and 6 bids. The bidding section declares double-sided technology. 'Multi-photovoltaic industry insiders said, 'Whether it is the application leader or the technology leader, the role of double-sided components is becoming more and more irreplaceable. In 2018, it may be the element of double-sided double-glass component explosion. year. '
Income increased by 10%
It is understood that the double-sided double-glass component refers to a component composed of two pieces of glass and a battery piece, which can generate electricity on both the front and the back. However, due to the excessive weight of the early double-glass assembly, inconvenient handling, and large power loss, It has not been able to achieve mass production in large quantities. The organic material backboard has gradually replaced the back glass as the mainstream market due to its low cost and other advantages.
Around 2013, after running for a period of time in domestic PV power plants, the back plate showed snail patterns, and the PID attenuation was too fast. This made the glass return to the public.
'In fact, probably in 2017, the domestic market gradually began to respect double-sided double-glass components. At present, we are also working with Ai Xu on a photovoltaic power plant project that uses double-sided double-glass components. If nothing unexpected, it should be possible in the near future. Net. 'Tang Shan Haitai New Energy General Manager Liu Qiang said.
According to Hanhua New Energy related person in charge, double-sided double-glass components provide a relatively good solution for high-quality photovoltaic power plants. 'Specifically, double-glass components have advantages in anti-cracking, anti-PID, long-term aging and so on. Obviously, the power generation is higher, about 21% higher than the ordinary components; the longer life, the life of the photovoltaic module can be extended by another 5 years, or up to 30 years; in addition, the attenuation rate is also lower.
At the same time, 'from the analysis of the cost of electricity, the double-sided components also have inherent advantages.' Long Meng Leye product director Wang Mengsong told reporters, 'After doing the power plant revenue analysis, we found that the double-sided components can achieve 10% increase, then This will greatly increase the overall investment yield. '
Ding Ning, manager of Guangdong Aixu Technology Marketing Department, agrees that 'double-sided double-glass components will be a future development trend, and it is also one of the means for enterprises to reduce electricity costs.'
Multi-pronged promotion
In addition to the above advantages, the double-sided double-glass assembly also makes it popular in terms of technical and production line compatibility. 'Double-glass components have only been upgraded in the production process, so that the current mainstream production line can be upgraded without major upgrades. Mass production, and, double-sided battery technology basically covers the current mainstream P-type PERC, N-type PERT and HJT battery technology direction, a wide range of application scenarios, so it has become the first choice for battery upgrades. 'Multiple industry insiders.
Despite this, the industry has put forward higher target requirements. 'When the double-sided double-glass component comes out, we can't just focus on the component itself, we need to change the thinking dimension, which requires us to unify all the steps, equipment and products. Taken together, it becomes a comparison of the advantages of a total solution, competition, which involves matching, coordination, optimization between various devices, or there is still a lot of work to be done. 'General Manager of Synergy Integrated Technology Department Wan Zhen Hua pointed out.
First of all, the double-sided double-glass assembly puts higher requirements on the bracket. If the bracket technology does not keep up, the power of the power station will be affected. 'Therefore, the design of the bracket is particularly important, such as the double-sided bracket that can significantly reduce the back cover. The application is very recommended. 'Wan Zhenhua said, 'Tracking bracket is also one of the future trends. Nowadays, the large-scale bidding project received overseas, 'double-sided + tracking' has become an inevitable option, and this trend is also domestic. I also think that This trend and proportion will come faster and more violently. ' It is understood that Trina Solar and other photovoltaic leading companies are also working to develop tracking technology.
Secondly, in terms of the border, Liu Qiang said that the components can be made according to customer needs. At present, there are small borders and large borders, the cost of large borders will be increased, and the cost of briquetting will increase.
Wang Mengsong told reporters: 'In terms of reliability, it has its installation method without a frame. At present, the mainstream market still has a border.
Wang Mengsong also added that supporting facilities, such as in the application of the inverter, the double-sided components should also be distinguished from the single-sided components. 'The instantaneous peak current has also exceeded 13A, which is bound to be the inverter's The current has higher requirements. '
Standard missing to be perfected
In the past two years, the double-sided double-glass components have gradually developed in response to market demand, but at the same time controversy. The biggest controversy is how to calculate the conversion efficiency and power of the double-sided components after increasing the back power.
In February of this year, the General Affairs Department of the National Energy Administration issued the “Circular on Soliciting Opinions on Photovoltaic Frontier Technology”, and proposed that there are two options for calculating the conversion efficiency and power of double-sided components: The conversion efficiency and power of the surface component, the installation capacity of the power station only calculates the positive power; the second is to comprehensively consider the back gain rate and the increased cost level in different environments. The calculation of the backside gain is not more than 5% in principle, and is initially considered as about 3%. The installation capacity of the power station calculates the sum of the positive and negative powers.
However, the specific plan is still inconclusive.
'When shipped last year, some manufacturers sold it according to the comprehensive power, that is, adding the front power and the back power, such as the front 290W plus the back 20W, the power is 310W. ' Liu Qiang said, 'but this year's testing and certification At that time, the competent department of the front-runner project must calculate the front power, so most of the year is only the front power, and the back is only used to calculate the power generation for the owner.
According to Zhang Yating, Ph.D., Shanghai Institute of Microsystems and Information Technology, Chinese Academy of Sciences, at present, the standard for double-sided components is based on the International Electrotechnical Commission (IEC), which mainly calibrates the double-sided rate and maximum power of the components, which makes the enterprise exceptional. Pay attention to the double-sided rate value.
'At present, the P-type double-sided rate can reach 75%, and the N-type is about 80%-85%. The publicity value in the market is very high. For example, the N-type is 90%. In fact, the bulk supply is 85. % is already very good. ' Liu Qiang told reporters.
Wan Zhenhua believes that when considering the double-sided rate problem, it must be considered comprehensively. 'After all, the main power generation of a component depends on the front. If there is only 10% reflected light on the back, the back is increased by 10%, which is equivalent to the front. Only increased by 1%.'
'When I made N-type double-sided last year, the front power reached 250-290W. If I want to pull up to 310W this year, in a short time, without any superimposed technology, it is very good for the battery and component manufacturers. Big challenge. ' Liu Qian added.
Although there is no consensus on how to calculate the power and calculation method of double-sided components on the market, industry insiders said that the development of double-sided double-glass components technology will continue to promote the desire to reduce costs and increase efficiency, and the products will be high-frequency. Sub-level upgrade.
