On October 30, the offshore wind blade S84 independently developed by Shanghai Electric Wind Power Group successfully passed the full-scale static test in Lianyungang. The blade is 84 meters long, making it the second longest blade in the world after LM88.4 meters, and it has also set a record for the longest blade in China. It is worth noting that this is also the longest glass fiber leaf in the world.
DNV GL, an authoritative third-party certification body at home and abroad, and the China Quality Certification Center (CQC) have witnessed this historical moment and highly recognized it. The test parameters of this leaf type meet the requirements of GL2010 and IEC61400-23 standards. The blade was delivered to the Zhongfu Testing Center on October 17, and after scientific and meticulous preparation, it completed the full-scale static load test in only 14 days. Its passing speed set a new record for the static load test of similar large blades . In order to further ensure the safety of blade design, Shanghai Electric Wind Power Group also applied for DNV • GL design certification while applying for type certification of domestic certification agencies. At present, GL has issued a certificate that the blade meets the design standards.
The S84 blade is a glass fiber blade independently developed by Shanghai Electric Wind Power Group and will be assembled on the new model DD6250-172 wind turbine set released by Shanghai Electric Wind Power Group. It is a large-scale blade customized for the low wind speed and wind resources in China's seas. It is suitable for the north of the Yangtze River and the north of Zhejiang and Guangxi. It is well known that, as a low wind speed blade, the increase of the blade length causes the stiffness and weight of the blade to become the bottleneck of the design. Although the S84 uses an all-glass fiber design, its weight can be controlled at about 29 tons. It can be seen that the design of the airfoil is difficult and the unit matching requirements are high. After systematic analysis, repeated demonstration and bold innovation, the blade design team of Shanghai Electric Wind Power Group broke through a series of design technical problems in the blade design process and successfully completed the design of the low-cost and highly reliable S84 blade. Through collaborative innovation with Zhongfu Lianzhong, a leading domestic blade supplier, it has developed large-scale wind power blade manufacturing technologies such as process design and lean production, and has completed the trial production of S84 blade samples efficiently and reliably.
As a large-scale offshore blade, in addition to excellent power generation performance, excellent reliability is also required. The excellent reliability of the S84 blade is reflected in all aspects of blade development.
It is mainly reflected in five aspects:
The first is airfoil reliability. The S84 blade adopts the SE01 blunt trailing edge airfoil family, which is characterized by a large thickness and a blunt trailing edge design with a maximum relative thickness of 57%. Excellent aerodynamic performance, higher stall angle and wider design angle of attack than the general airfoil family, more suitable for the large blade market demand in the sea. Each standard airfoil in this airfoil family has undergone detailed CFD simulation, wind tunnel test verification, and batch-on-hook operation test, and the airfoil family has been fully verified during the operation of large-scale wind farm , Fully demonstrated the high aerodynamic efficiency, high aerodynamic stability and other characteristics, and has been unanimously praised by the majority of owners.
The second is the reliability of pneumatic accessories. Shanghai Electric Wind Power Group takes a very cautious approach to the development of each pneumatic accessory. In the design process of each VG product, it has undergone a large number of CFD simulations, wind tunnel tests, and wind farm on-hook tests. Among them, CFD simulation not only includes the commercial software Renault average simulation, but also carries out fine large eddy simulation calculations to further study the effect of VG on flow control and the three-dimensional flow mechanism.
The third is structural reliability. The S84 blade adopts the finite element method for structural design. Among them, the buckling and IFF analysis adopts the requirements of the latest GL code, and the structural analysis is checked in 12 directions. The calculation results show that the safety factors all meet the requirements of the code.
The fourth is manufacturing reliability. Reliability is assured both by design and manufacturing. In the S84 design process, based on the manufacturing-oriented design concept, 3D layering software was used to design the blade layer structure, and each layer in the blade was accurately positioned to simplify the layering operation during production. The use of large-scale tooling such as on-line gluing, large web integrated positioning and bonding tooling to aid manufacturing reduces the impact of human operations on product quality and improves manufacturing reliability. In addition, in order to avoid the excessive sagging adhesive in the mold bonding, which causes abnormal noise and damage to the blade during the later operation, the web PS surface bonding mold clamping technology is used.
Fifth, lightning protection reliability. The possibility of lightning strikes on offshore blades is higher than on land, and the difficulty and cost of repairing offshore blades is much higher than on land. Therefore, the lightning protection of offshore blades must be rigorously designed and tested. The S84 blade lightning protection system was commissioned by a famous foreign lightning protection design company. Prior to this, the blades of Shanghai Electric Wind Power Group adopted the lightning protection system passed the lightning protection test of IEC61400-24 standard and obtained DNV • GL certification. Subsequent S84 blades will be shipped to Europe for lightning protection testing.
Nowadays, China's offshore wind power is developing in a large-scale trend. As a large component that determines the wind capture capability of the unit, high reliability, high performance, and large wind turbine blades are the key to breakthroughs in the development of offshore wind power equipment. For a long time, Shanghai Electric Wind Power Group attaches great importance to the research and development of wind power blade technology, and emphasizes the importance of system engineering technology for the collaborative design and optimization of blades and the whole machine. In the past 12 years, Shanghai Electric Wind Power Group has independently developed and designed more than ten blades, creating a domestic leading blade solution team. The wind power blade technology team of Shanghai Electric Wind Power Group has always adhered to the formulation of product routes based on low electricity costs, always adhered to the technical strength as its core competitiveness, built a complete, efficient, and independent research and development platform to expand key blade technology research and development.
China's offshore wind power is about to enter the bidding era, which also brings new challenges to the booming offshore wind power industry. How to reduce the power cost of the whole life cycle has become a difficult problem facing the industry. As the largest offshore wind power generator company in the country, Shanghai Electric Wind Power Group is continuously strengthening technological breakthroughs and innovations to overcome difficulties and continue to lead the industry development.