Photovoltaic bracket - The core component of a photovoltaic system
It is well known that achieving parity will require further reductions in the cost of electricity per kilowatt hour, or increased efficiency in electricity generation. Around efficiency improvement, but in the short term there is limited room for improvement. For example, the efficiency of the inverter is close to 99%. The components are affected by cost and process, so it is obviously uneconomical and unrealistic to improve the efficiency significantly in a short time. It is widely believed in the industry that system optimization has become another path to affordable Internet access. High hopes are pinned on the pv support system, a product once considered "low-tech", which, when combined with the tracker, is starting to show an edge in increasing photovoltaic power station revenues. Experts say the plant could increase its output by 10 to 30 percent with tracking supports. Is the tracking system really as "divine" as the legend suggests? Here's a guide to how stents and tracking stents can open up the world!
So what is a photovoltaic cell?
Bracket: a special bracket designed for placing, installing and fixing solar panels in a solar photovoltaic power generation system. General material has aluminum alloy, carbon steel, stainless steel. Galvanized metal materials are widely used in solar support enterprises. At present, the general fixed bracket accounts for about 10% of the cost of the whole system, and the tracking bracket system and the floating bracket on the water surface are about one time higher than the price of the fixed bracket.
Review the history of stent development:
Industry insiders believe that the first year of China's photovoltaic stents began in 2005. It is marked by wu Shoubin's founding of Shanghai Shidui Technology Co., LTD., which at that time provided OEM products for Sunpower, a U.S. photovoltaic industry company. Since then, China has officially started to own photovoltaic bracket production plants.
In 2008, Chinese pv support enterprises successfully entered the Australian market. At that time, the market was mainly based on the civil roof, stainless steel hook with aluminum alloy track, featuring rapid installation, which was the prototype of photovoltaic bracket and has been used so far. In the same year, Qingyuan Optoelectronics, Ikang Metal, Zhongxinbo, Guangdong Ikang and other support giants were established apart.
At the end of 2009, due to the nuclear crisis in Japan, the Japanese government resumed the photovoltaic market, and Chinese companies quickly entered the market.
In 2010, the domestic market was officially launched. Considering the cost factor, most of the owners chose carbon steel, aluminum alloy and other materials as the ground photovoltaic bracket.
After the fukushima nuclear power plant accident in early 2011, the development of Japan's ground photovoltaic power station was further accelerated. It was at that time that many aluminum alloy and steel structure enterprises in China realized the potential market of photovoltaic bracket, and the spiral pile technology was introduced to China from Europe and made bold improvement by Chinese enterprises.
In 2012, China further introduced uniaxial, flat-uniaxial and biaxial tracking technology from abroad. Due to the particularity of The Chinese market and the instability of tracking stents, tracking stents should be limited in China. Adhering to the concept of introduction, digestion, absorption, innovation, China's photovoltaic support engineers developed the color steel tile support, for the market in various, fixed difficult color steel tile roof design and development of a variety of different types of section, opened the era of color steel tile roof photovoltaic system.
After 2012, with the development of China's ground photovoltaic power stations, various conventional installation mode supports, pre-installed photovoltaic supports and adjustable photovoltaic supports have been developed.
Relevant data show that the global installed capacity increased by 47GW in 2015, the cumulative installed capacity was 227GW, and the annual sales volume was about 35 billion yuan. Among them, the installed capacity of tracking system market is about 8.8GW.
Does the stent matter?
Mentioned bracket, a lot of people in the concept of it is still a lack of technical content of the accessories, from wooden fixed bracket, the aluminum alloy fixed bracket, then to the moveable track bracket, a lot of photovoltaic enterprise does not seem to have put stents in eyes, because in contrast semiconductor relatives "crystal" compared with "polycrystalline" r&d should not flashy.
On the way to parity, however, it is very difficult for modules to increase efficiency by 1 per cent. A photovoltaic bracket tilted slightly at an Angle could increase output by more than 5 per cent. Fixed bracket, for one, because of its inclination is selected according to annual total radiation value larger, weekly, monthly, quarterly, half year actually has the better Angle of the corresponding, if in the corresponding period choose corresponding better Angle, can obtain more than the annual better Angle of electricity, so the Angle adjustable mounting bracket can also increase generating capacity.
Adjusting the Angle of the bracket on a monthly or quarterly basis can increase the annual generating capacity by about 5%. The advantage of the tracking support is even more obvious. Since the sun's orbit moves relative to the ground from time to time, following the sun's orbit will greatly increase the amount of electricity generated by the light irradiation received on the component surface.
If a tracking bracket is used and the track is set so that it follows the sun and constantly adjusts its tilt Angle, it can increase power generation by 30%. At the launch ceremony of the "double-sided" power generation cell launched by Zhonglai Photovoltaic, Dr. Liu Yong, head of the company's research and development, told the reporter of Century New Energy Network: "The efficiency can reach 168% if combined with double-sided + tracking system." That would be unthinkable for any other branch of the photovoltaic industry.
In photovoltaic (pv) ten years of development, even support such obvious advantages, and its are frustrated in the process of application, for fixed bracket, its easy to become a bone of contention is the industry, corrosion in jinzhai county in anhui photovoltaic poverty alleviation projects, its 23 villages and towns to build power station 26, found in the process of acceptance of the foundation and pillar connection steel corrosion is serious. In the water pv project, the corrosion of support will occur more frequently.
For output tracking stents can be greatly improved, it has not been large-scale applied its reliability is one of the important reason why, as early as in 2009, our country will rise a wave track bracket installation boom, but at that time, because the product stability, appeared a lot of application project support oil seal structure, weak ability to resist wind, control system failure, the phenomenon such as motor burn down and its application in failure. This also leads to the fact that many enterprises are still in a wait-and-see situation even though the technology of tracking support is constantly innovative and the stability is constantly enhanced. So what are the technical challenges facing the stent, what are the patent technology innovations of each stent enterprise, and what will be the development trend of the stent industry in the future?
