Polaris solar PV net news: along the way, driven by new energy development in Xinjiang has become the focus of attention in the industry. Both wind and solar power, the Xinjiang new energy has a unique gift of nature. Do not consider the impact of abandoned wind up, regardless of the local costs of fossil fuel power, new energy and photovoltaic power plant investment point of view, as a PV, and couldn’t help but think: what components are most suitable for use in Xinjiang?
1. the magic of Xinjiang, various climate types
Xinjiang ranked City Center, around away from the sea, is surrounded by high altitude mountain, is a temperate continental climate, the winters are cold, hot and dry in summer, spring and fall short, dramatic changes. To about 15 degrees latitude North and South Xinjiang, terrain elevation, South and North Xinjiang has divided into warm and cold, temperate, and obviously the difference between wet and dry, the same area due to topographic height difference and has a distinctive climate characteristics of vertical, caused the differences between East and West, the mountain landscapes of Xinjiang. Xinjiang in arid climate under the influence, become China’s driest, hottest, coldest, sand temperature difference between the largest and one of the largest places, such as “fire” the hottest, eastern Xinjiang Turpan and Tarim basin in southern Xinjiang, drought, cold, sand, to Alataw pass of fuyun,. Standing on the ground great mountains in Xinjiang, many spectacular glacial snow, quiet forest spring, beautiful summer pastures in summer climatic conditions do not have features, is an excellent summer resort. Northern cold and snowy in the winter, snow.
Xinjiang is a temperate continental climate, its climate is characterized by big temperature difference between day and night, is typical of a continental arid climate, drought in southern Xinjiang, drier, annual precipitation is 20-100 mm, while the Northern up to 100-500 mm. 10C-13C annual Southern Plains, Northern Plains below 10C. Extreme maximum temperature in Turfan 48.9C, extreme minimum temperatures in fuyun County, borders the koktokay had reached -51. 5C。 200-220 days of frost-free period in the southern plain, Northern Plains are mostly less than 150 days.
Therefore, the characteristics of Xinjiang climate: dry and cold in winter, hot in summer, the temperature difference, between East and West, the same region varies at different altitudes, also accompanied the storm, Blizzard, sandstorm and hail.
2. the light resource in Xinjiang
Xinjiang in Western China, has rich resources of solar thermal. Total solar radiation in Xinjiang reached 5000~6400MJ/m2, ranks. Above the 6000MJ/m2 in the southeast of Xinjiang, Northwest of 5800MJ/m2. 5200~5600MJ/m2 in northern Xinjiang total solar radiation, which the Ili River Valley, boertalagudi, Tacheng basin, the radiation of the Irtysh River Valley about 5400MJ/m2; in 5200MJ/m2 the following total solar radiation in Central junggar basin, Xinjiang plain area of the least amount of total solar radiation.
Key belonging to the Xinjiang wind energy, solar energy development in Hami area. Rich in solar resources and great development potential. Hami solar radiation monitoring station data (Figure 7), the total average annual solar radiation 6393MJ/m2, Hami Prefecture.
3. performance requirements for components
For such a harsh climate conditions, illumination it is so rich in resources. Combined with the absence of pollution components will actually receive light resources far higher than that of other cities in the Mainland. Therefore, choosing the right components for the performance of photovoltaic power plant investment in the region is of great significance.
A … According to the characteristic dry climate, the component needs to crack anti-dry
No indicators to measure this performance seems to be, don’t know if IEC standard will do to the new requirements, but it seems to have not heard of components dry.
B.-good low temperature resistance
Due to the extreme minimum temperature will be below zero in the Xinjiang region around 50C, IEC standard test cycles are only -40C or so. This is of key support is component of package material as EVA and back Board are is plastic material, its glass of change temperature Basic are in minus 40C above, if environment temperature really to minus 50C,EVA material may has completely lost elastic, variable crisp, and by hot rose shrink led to of deformation on may makes EVA material cracking, is battery tablets occurred lobes, this for component of life may is fatal of. Now probably new silicone encapsulating material can be a solution to this problem, but silicone encapsulated components are rare. So EVA encapsulation of commonly used components can withstand the test of minus 50C, needs more data.
C. lower temperature coefficient
Due to the strong sunshine, dry, even in parts of “Flaming” component in the daytime temperatures can be very high. The temperature coefficient of the component if, say, a component of power efficiency will be seriously degraded. Built in hot area is suitable for PV power plant, or building components how to select a low temperature coefficient when PV power station became one of the key points of power station design.
D. stronger resistance to mechanical loads
Due to the snowstorm in the Xinjiang region and the effects of the storm, component and mechanical loading performance might require higher, not just static mechanical load (snow), dynamic mechanical loads is a key performance (air pressure). When selecting components to consider in low temperature mechanical properties, due to EVA’s flexibility has disappeared, resistant to snow and wind pressure test at this time is the real test. General machinery and testing and wind pressure tests are carried out at room temperature, not in Xinjiang’s actual use of environmental requirements. Also redefined for test standards, test equipment development and adaptation, could become a research topic, rather than one or two sentences can be said clearly.
E. better shock resistance
Component resistance to mechanical impacts there are hail impact test. In the Xinjiang region, and hail from not only the impact of the outside world, and dust. Can’t imagine wind speeds in other areas, large diameter of gravel impact maybe like fire in the array. IEC standards have different levels of resistance to impact test, that is, with different diameter hail impact components at different speeds to simulate the natural environment. Components must be considered when selecting hail impact testing
F. scratch-resistant glass surface performance of assemblies
This requirement is primarily given to dust under the wind. Many components are coated glass is used to improve the power output of a component. But in the Xinjiang region, whether the coating on glass surface can easily be scratched, damaged, once it has been destroyed, the nominal power of the component will reduce the percent, this is a test for return on investment. Design must be considered when selecting the component to it.
G. better junction box
Junction box is of plastic material, will be brittle at low temperatures, this time not only heat expands and cold cracking, also in case of low temperatures, poor flexibility, impact resistance is greatly reduced. Dust impact will not lead to the junction box of the docking box open, would like to have more data to illustrate.
H. components of the rear structure
Traditional components, all glass and back plate. When the component installation, components are facing South, thus leaving the weak back Northwest. Back directly from the Siberian winds and because the wind was blowing sand. Back panel of low temperature resistance and impact performance on the back of the component will be put to a severe test. Mentioned components impact resistance-hail from the frontal impact test is, while the actual components installed, the rear side to withstand wind and blowing sand from Siberia when struck, the component will become the golden helmets of iron cloth shirt on the back gate of life.
I. module conversion efficiency
Because resources of Xinjiang have this great illumination, the higher conversion efficiency of components increase its power generation efficiency of cooperative multiple. The significance of the cost per kilowatt is more important.
4. the recommendations of the component selection
Select components are complex and varied climate conditions in Xinjiang is not only it is necessary to take into account the factors of Xinjiang, also taking into account the climate characteristics of different areas of Xinjiang, according to local conditions to choose suitable products. As a PV, and simultaneously as a double glass components of enthusiastic supporters, I think, many climate conditions in Xinjiang, such as extremely low temperature, snow pressure, winds, back of the component mechanical loads, temperature coefficient, and so on, may be suitable for double glass components, especially like BYD launched silicone double glass component package. Silica gel -68C glass transition temperature in Xinjiang under extreme low temperature flexibility, reduce battery cracked, and fragmentation, the thermal conductivity of silicone double glass and components, temperature coefficient, resistance to mechanical loads and impact resistance on both sides to ensure the adaptability to extreme environments in Xinjiang. Of course, the actual application of time and tested in practice.
Original title: photovoltaic power station of Xinjiang nine requirements for components and selection of proposals