China's photovoltaic power plant will be built on a scale of 10-12 gw in 2014, representing one quarter of the world's total. Entering the second half of the year will be the peak of construction of the photovoltaic plant。
By the end of 2013, there were a cumulative network of 741 large-scale photovoltaic projects in 22 major urban areas of the country, mainly in the north-west. Not entirely, in july 2014 listed companies announced 10 projects of a scale of 1. 1 gw in the construction or proposed construction of photovoltaic plants。
At present, however, the large-scale problems with the quality of the installed photovoltaic power stations are of particular concern, including the fragmentation of the components of the large ground power stations, the thinning of coatings and the burning of backboards。
The problem of plant quality was also highlighted as the main reason why banks were reluctant to lend to projects. Wang seong, researcher at the national institute of energy of the national commission for development and development, indicated that the technical guidelines for the testing and quality assessment of optical power stations (approval draft) would be introduced at the end of september, focusing on the performance ratio of photovoltaic stations and providing a basis for future power station transactions and bank loans。
Quality problems at domestic power stations
Two years of investment too fast, combined with a lower investment threshold, which led to an explosion in production capacity, followed by the expulsion of bad currency
On 5 august, a seminar on efficient and reliable operation of large photovoltaic plants and efficiency of power generation was held in hao and hot, kenya, at which wang sing, a researcher at the energy research institute of the national commission for development and development, indicated that, following a visit to a large number of power stations in the west, a number of problems had emerged after the station had been operational for some time. The quality of the power plant, on the other hand, directly affects its revenues, which is an important reason why banks are currently concerned about investing in it. At present, however, power plant developers do not pay enough attention to this issue, which is harmful to industry。
According to zheng guang zhi, president of the china region of the ministry of electronics and communications of the du-pang ministry, china has invested too fast in the light-volt industry in the first two years, combined with a low investment threshold, which led to an explosion in production capacity, which led to the expulsion of coins. Many power plant developers use a large number of poorly quality components in pursuit of investment costs. He also told journalists that well-depleted products could decline by 0. 5 per cent per year, while some untested products could decline by more than 5 per cent。
“although these plants reduced the installed costs per watt, they also reduced their useful life, which was in fact a significant loss. We now call on the developers of the power plant to ignore the cost of construction per watt and to focus on the cost of measuring electricity.” zheng zheng zheng zhi says。
Jung also explained that, according to dupont's calculations, the life of the power plant was calculated at 25 years, with a difference of 9. 4 per cent in return for investment compared to 0. 8 per cent and 5 per cent in the use of generating power. In another way, the best backboard material and the worst backboard material are now only 0. 12 yuan (6. 1705-0. 0075, 0. 12 per cent) at the cost per watt, i. E. 25 days of output earnings would fully cover this cost。
According to zheng constitutionally, the use of low-quality photovoltaic components will lead to significant future financial pressures on power station developers, which will come to light after 5 to 10 years and then be further transferred to loan banks and local government agencies。
This year, the global total of photovoltaics will reach 40 gw, of which china will account for about 10-12 gw, and the second half of the year will be marked by a wave of photovoltaic plants, which are already operating。
The deputy director of the beijing centre for accounting and certification gave a set of data, and after testing 472 power stations, the centre found that the problems of the current power stations were mainly twofold. The first is the perspective of the power plant system, and the second is the perspective of the power plant equipment, which includes the high level of defects, the high degree of co-loss, the lack of assurance of quality, differences in quality, etc。
This has also been investigated by dupont, who, after visiting a large number of large ground power stations, have also found problems such as cracking of backboards, thinning of coatings and burning of backboards。
An in-house person who visited a number of ground power stations stated that he had seen instances of different use of backboard materials on both panels adjacent to some of the stations, suggesting that the products used on the stations and those tested were not “consistent”。
Testing system to be established
19 criteria, including electrical efficiency of the system, component decay, containment, photo-reaction loss, mppt error, measurement error, failure and operational maintenance level
Wang si, a researcher at the energy research institute of the national commission for development and development, indicated that the systems for component quality testing were not currently regulated and would focus on addressing the issue in the future。
Wang sing told journalists that the technical guidelines for the detection and quality assessment of photovoltaic power stations (the draft for comments) (hereinafter referred to as the technical guidelines) would be launched at the qinghai energy authority meeting in september. The technical specifications are based on the pv performance ratio (performanceratio), with a total of 19 pr criteria for pv plants, including system electrical efficiency, component decay, blockage, photo-reaction loss, mppt error, measurement error, failure and operational maintenance levels. This indicator excludes geographical and resource differences and reflects more objectively the performance and quality of photovoltaic systems themselves。
“through this report, investors can be told what the combined power generation efficiency of this power plant is and what is the problem of inefficiency.” wang's introduction。
Wang sing told journalists that the pr standard was in fact long-standing, but that none had been applied before, and that the technical guidelines, when issued, would be of great significance for future power station transactions and bank loans and would serve as an important reference point. The test of the technical instruction will be completed one month or one year after the construction of the plant, with an objective description of the actual operation of the plant。
In addition, wang sing indicated that it was recommended that the testing unit increase its sampling effort in view of the problem of “consistency” between the products being tested and those used in the final batch on the power plant. Degrees
The president of the greater china region of the ministry of electronics and communications of the dubun province, zheng guang ji, has indicated that the most important focus of the industry today is on the quality of the power plants that own them, such as the holders of the power plants, such as the medium-firing, the chinese nuclear plant, the three isthmus and the medium-energy-saving power plants, which will take into account the quality of the materials. He also found that a number of banks had begun to recognize the important role of quality in yield rates and had begun to require certification of component materials when providing project financing。
China finance and leasing ltd. (hereinafter referred to as china kim) told journalists that china kim's investment in power plants was mainly concerned with six issues, including light resources, land concessions and leasing, component quality, quality of the epc project, access to transmission lines and power restrictions and the availability of subsidies, of which component quality was a major concern。
However, it has also been suggested by industry enterprises that at present some developers are forced to focus less on the quality of component products, and one developer has indicated to himself that during the time when the power plant is loaded, it is impossible to take into account the quality of the component。
According to zheng, every industry has a painful period, and only an increase in the efficiency of its operation and a focus on quality rather than on cost can guarantee 25 years of its life and attract capital and sustain its growth。
Responsible editor: zhang dei
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