Twelve characteristics of global wind power manufacturing technology development (2)

5. Doubly-fed asynchronous power generation technology still dominates the V80 of Denmark's Vestas. The V90 represents a double-fed asynchronous power generation variable-speed wind turbine, which has the largest share in the international wind power market. The unit capacity developed by Repower in Germany using this technology has reached 5MW. Siemens, Nordex of Germany, Gamesa of Spain, GE Wind of the United States and Suzlon of India are all producing double-fed asynchronous generator-type variable-speed wind turbines. In the new wind turbines of 2009, double-fed asynchronous generator-based variable-speed wind turbines still accounted for 80 %the above. At present, Europe is developing a 10MW double-fed asynchronous power generation VSWR wind turbine.

Chinese domestic companies Huarui Wind Power, Dongfang Gas Turbines, Guodian United Power, Guangdong Mingyang and other companies are also producing double-fed asynchronous power generation variable-speed wind turbines. In 2009, in China's newly added wind turbines, double-fed asynchronous power generation variable-speed wind turbines still accounted for more than 82%. At present, the 3MW double-fed asynchronous generator-type variable speed constant-frequency wind turbine developed by Sinovel has been put into operation.

6. The direct-drive and full-power conversion technology has been rapidly developed. The direct drive without gearbox can effectively reduce the unit failure caused by the gearbox problem, effectively improve the system's operational reliability and life, and reduce maintenance costs. As a result, it gained the favor of the market. Germany's Enercon, which has a gearless box system, was still the largest supplier of wind power in Germany and Portugal and the second largest supplier of wind power in India in 2009. Among the new wind power installed capacity, Enercon has already occupied the domestic market. More than 55% of the share. Siemens has installed two 3s in the western part of Denmark. GMW's direct-drive wind turbines, these two wind turbines are in trial operation. Other major manufacturing companies are also actively developing direct-drive wind turbines. China's Xinjiang Goldwind Technology Co., Ltd. and Germany's Vensys Co., Ltd. have developed 1.5MW direct-drive wind turbines and thousands of them have been installed in wind farms.

Goldwind Technology is the second largest supplier of wind power market in China in 2009. At the same time, China's Hunan Electric Power Company's 2MW direct-drive wind turbine has also entered the market in bulk. Others such as: Guangxi Galaxy Amaidi, aerospace Wanyuan, Weifang Ruiqieng, Baotou Huiquan Rare Earth, Jiangxi Meide, Shandong Luneng and other manufacturing companies have also developed a direct-drive wind turbine. In the new large-scale wind turbines in 2009, direct-drive wind turbines have exceeded 17%.

With the advent of direct-drive wind power systems, full power conversion technology has been developed and applied. The application of full-power variable-current grid-connected technology allows the wind turbine and generator to be extended to the speed range. Up to 150% of rated speed improves the use of wind energy. Because full power converter technology has a very good and simple solution to low voltage ride through technology, it has an advantage for the next step of development. At the same time, semi-direct drive wind turbines also began to appear in the world wind power market. In the bearing support mode, a single Slewing Bearing instead of a spindle and two bearings has become the choice of some 2 MW or more units, such as: Flanders 2.5 MW fan, which shows that no spindle system is becoming the development of European wind turbines A new trend.

7. The performance of key components of large-scale wind turbines is increasing. As the capacity of single-unit wind turbines increases, the performance indicators of all components have been improved. Foreign companies have developed 3000V-12000V wind turbine dedicated high-voltage generators to generate electricity. The machine efficiency is further improved; the application of high-voltage three-level converters greatly reduces the power device losses, making the inverter efficiency more than 98%; some companies have also optimized the blade and pitch system, such as the German ENERCON After the company improved the blade, the Cp value of the blade reached more than 0.5. From the perspective of the 2007 Husum Wind Energy Exhibition, the industrial chain of European wind power equipment has been formed, laying the foundation for the rapid development in the future.

China has also made significant progress in key components of large-scale wind turbines, such as large-scale wind power produced by major gearbox manufacturers such as Nanjing High-speed Gearbox Factory, Chongqing Gearbox Factory, Heavy Reducer Factory, Hangzhou Advance Gearbox Factory, and Deyang Erzhong etc. The gearbox of the unit has sufficient supply capacity and the quality has been significantly improved; Baoding Huiteng, Lianyungang Zhongfu Lianzhong and Sinoma Technology have been able to produce large-sized blades up to 48.8m, which are matched with 3MW wind turbines, Lanzhou Electric The quality of generators and other products produced by the plant has been greatly improved. From the perspective of the fourth Shanghai Wind Energy Exhibition in 2009, the industrial chain of wind power equipment in China has been formed, laying a solid foundation for the rapid development in the future. China has advantages in certain infrastructure components, castings and forgings, etc. It not only meets the needs of the domestic market, but has also been supplied to the international market.

Beijing Kenuo Weiye Energy Technology Co., Ltd., Hefei Sunshine Power Co., Ltd., Beijing Qingneng Huafu Wind Power Technology Co., Ltd., Tianjin Ruineng Electric, Longyuan Electric, Jiuzhou Electric and Xiaowang Electric, etc. Wind turbine converter R & D, production and supply capacity.

8. The application of intelligent control technology accelerates the reliability and life of wind turbines. Given that the ultimate load and fatigue load of wind turbines are one of the main factors affecting the reliability and life of wind turbines and components, in recent years, wind turbine manufacturers The relevant research department actively studied the optimal operation and control law of wind turbines, and through the use of intelligent control technology combined with the overall design technology, efforts were made to reduce and avoid the operation of wind turbines at the limit load and fatigue load, and gradually become the wind power control technology. The main direction of development.