Wind Energy: At this year's Global Offshore Wind Power Conference, many voices are calling for attention to the reliability of offshore wind turbines. What are the key links involved in the reliability of offshore wind turbines? How should we control it?

Yu Chenguang: Ensuring the reliability of wind turbines is a systematic control process, with key links including design, quality management of supporting chains, testing, and small batch verification. Goldwind always adheres to the concept of "wind power is a long run", and strictly controls product quality and reliability, which is also a key factor for Goldwind's reliable products and brand image to gain market recognition. Goldwind has also been putting this concept into practice. In the unit design process, such as the design and selection of transmission chains, there are significant cost differences behind different transmission chain structural designs.

Goldwind fully considered the risk of quality and reliability in the process of cost optimization of transmission Technology roadmap, and finally adopted the design of external spindle double bearings among dozens of choices. Although this design increases the cost of the main engine, the load environment of the gearbox and generator is better, which can unload most of the unfavorable loads transmitted by the impeller, greatly improving reliability; At the same time, the design of the transmission chain can ensure the replacement and maintenance of the gearbox and generator without dismantling the impeller and engine room, which can avoid the use of large installation ships and reduce operation and maintenance costs. In the aspect of experimental verification, Goldwind has built a world leading experimental testing center in Yancheng, Jiangsu Province, which has four levels of experimental verification capabilities, including material parts, subsystems, complete machines and field network links.

For example, the whole machine test bench is mainly used to transmit a torque for the test drive end in the industry. The whole machine test platform put into use by Goldwind can not only transmit torque, but also use the hydraulic system to load the whole machine to simulate the real load after the installation of the impeller. Equivalent to testing the reliability of the entire transmission chain system through loading without lifting the unit. Goldwind also has a professional anti-corrosion laboratory, which can carry out validation tests for temperature, humidity and salinity in different coastal areas. In the supply chain management link, Goldwind strictly controls the technical specifications, insists on not controlling costs by reducing technical requirements, and does not reduce costs and increase efficiency at the expense of reliability.

Wind Energy: During the forum session of the conference, experts presented their own views on reducing costs and increasing efficiency of offshore wind turbines, striving to find a balance point suitable for the current development of offshore wind power in the "impossible triangle" of cost, performance, and reliability. In your opinion, is it really unsolvable that the premise of ensuring product reliability and performance is to reduce costs?

Yu Chenguang: Not without a solution. In fact, the era of offshore wind power only focusing on wind turbines has passed, and now it is necessary to focus on overall systemic costs. In addition to the cost of the main engine, the impact of the integrated design capability of the support structure, lifting efficiency, and quality reliability on the overall cost of offshore wind power requires high attention.

Taking the 16MW model as an example, its impeller diameter reaches 252m and blade length reaches 123m. However, the blade designed with a carbon fiber main beam weighs 10t less than the blade made of fiberglass material. As we all know, the relative cost of carbon fiber girder blades is high, and the reason why Goldwind is firm