The construction land environment of the project is different, and the selection requirements of photovoltaic brackets are naturally different. In the case of increasingly tight new energy land, with the development of photovoltaic power generation technology, photovoltaic power plant land is also moving towards the slope, sand and even the ocean, which poses new challenges to the selection of photovoltaic support. So, what factors should be considered in the selection of photovoltaic brackets? What are the new features of new technologies such as tracking bracket and flexible bracket in the promotion and application?
Comprehensive geographical conditions, power restrictions, bidding rules to optimize
In the process of bracket selection, factors such as topography, geological conditions and land area should be fully considered. For example, the flat single-axis tracking bracket has certain requirements for the slope of the terrain, and the area with a slope greater than 10 degrees is usually not suitable for installing the flat single-axis bracket, and at this point, the fixed bracket is more applicable. For example, if the adjustable bracket is used, it is also necessary to consider the location of the power station, whether the operation and maintenance personnel are easy to reach, and whether it is convenient for subsequent adjustment operations. If conditions permit, it is recommended to use advanced technologies such as fixed adjustable, flat single-axis tracking, and adjustable elevation dual-axis tracking to increase power generation.
In addition to the objective natural conditions, the various factors such as taxes, environmental requirements and power limiting of the power station are also important indicators that need to be referred to in the comprehensive optimization process. In many cases, an increase in power generation does not necessarily lead to an increase in comprehensive earnings. According to the actual situation, whether the power station is facing the problem of power rationing, how much the proportion of power rationing, and the implementation of the number of guaranteed acquisition hours should be taken into account, and the return on investment and economy of the stent products should be comprehensively measured. It should also be considered according to the actual situation of different projects. The specific bidding optimization rules also affect the selection of bracket to a large extent. In the previous PV leading base project, the higher the system efficiency, the lower the electricity price, the higher the bidding score, at this time, it is necessary to seek the balance point of price and power generation, so as to choose the appropriate bracket.
Tracking stent market expansion
Technical details need to be optimized and upgraded
From the perspective of improving the power generation, compared with the traditional fixed bracket, the tracking bracket can be adjusted in real time to make the photovoltaic module face the ****** Angle of sunlight, thus improving the power generation efficiency. The reporter learned that at present, with the continuous advancement of the construction of domestic scenery bases, the market demand for tracking supports has also begun to expand. In the early years, the failure rate of the tracking bracket is indeed relatively high, and is subject to technical reasons, and the terrain is not very suitable. Globally, shipments of tracking stents exceeded 51 million kilowatts last year, an increase of about 12%. It is expected that in 2022-2030, the market demand for solar tracking brackets will exceed 660 million kilowatts. Despite the relatively low acceptance of tracking stent in China, in terms of total volume, China is still the largest tracking stent installation market in Asia.
As the market scale continues to expand, the tracking bracket also needs technical optimization and innovation in many aspects. For example, in some mountains and slopes, the universal joint of the main shaft is one of the more common points of failure, which is where the technical upgrade needs to be made. In addition, the compatibility of large-format components and the optimal design of adaptive double-sided components are all problems that need to be solved in the follow-up development of the tracking bracket.
Flexible support for complex terrain
The standard specification needs to be perfected
Thanks to the terrain conditions of desert, Gobi and desert, the requirements for installation slope and operating environment under components are not strict in the selection process of support for the large base project. However, it is more urgent to adapt to the complex and diverse terrain in the mountainous areas of southwest and central and eastern regions where the large base model cannot be implemented. The biggest feature of the flexible bracket is that it has a large span, high headroom, and sufficient space under the component, which is conducive to carrying out the 'photovoltaic +' project." The flexible bracket can span complex terrain, and is very suitable for photovoltaic installation in fish ponds, complex slopes, sewage plants, beaches, canals and other places.
However, due to the technical characteristics, the practical application of flexible brackets also has challenges. In view of the meteorological conditions that the power station may face, the most critical problem is to suppress wind vibration because of the small stiffness of the flexible components. In this regard, it is necessary to take the necessary wind resistance measures such as adding ground anchors and wind cable trusses. In the design process, wind tunnel experiments are often used to verify the stability of the structural system. In terms of design, the structural analysis of the flexible bracket is more complicated, and there are many influencing factors, and there is no relevant national design code and technical standard. These are the problems that need to be solved in the future development of flexible supports.
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