On April 20, 2021, the DEW-5.5S-172 permanent magnet direct-drive onshore wind turbine independently developed by Dongfang Wind Power with completely independent intellectual property rights was successfully rolled off the line at Dongfang Tianjin Wind Power, which is currently the largest single-unit capacity in China. , Permanent magnet direct drive onshore wind turbine with the largest impeller diameter. Its successful rollout marks the official start of the "6MW era" of Dongfang Wind's onshore wind turbines. The company has made a new major breakthrough in the development of onshore high-power wind turbines and celebrated the 100th anniversary of the founding of the Communist Party of China with its outstanding achievements.

The DEW-D5.5S-172 permanent magnet direct drive wind turbine is a new generation of onshore high-power wind turbine developed by Dongfang Wind Power for the medium and high wind speed areas in the country. It adopts 1140V medium voltage electrical system, permanent magnet synchronous generator, and full power. The overall technical solution for variable flow. The electrical system adopts a dual-circuit design scheme, which can realize single-circuit independent operation; the generator adopts a double-bearing support structure, which has strong carrying capacity. The permanent magnet motor magnet adopts patented protection technology to ensure the safety and reliability of the magnet; Redundant design concept, average trouble-free operation time can reach more than 3,600 hours; the blade adopts high-efficiency and flexible design, and advanced technologies such as vortex generators, flaps and serrated trailing edges are applied to effectively improve blade aerodynamic performance and reduce blade noise.

Helping to achieve "carbon neutrality"

The single unit capacity of DEW-D5.5S-172 permanent magnet direct drive wind turbine is adjustable from 5.5 to 6MW, and the impeller diameter is 172 meters. The platform unit adopts a modular design concept, and the proportion of important components is high, and it has been fully verified. At the design wind speed, a single 6MW unit can output 22 million kilowatt-hours of clean electric energy per year, which can reduce coal consumption by more than 7,150 tons, reduce carbon dioxide emissions by more than 17,300 tons, sulfur dioxide emissions by more than 120 tons, and nitrogen oxide emissions by more than 180 tons. The efficiency of drainage is significant. As it is put into operation in batches, it will surely become the eastern "main force" in the process of achieving the grand goal of "carbon peak" and "carbon neutrality".

The development, production and commissioning of DEW-D5.5S-172 permanent magnet direct-drive wind turbines can greatly reduce operation and maintenance costs and engineering costs. Compared with 3-4.5MW units, the number of units can be reduced by 25% to 50 %, the project cost can be reduced by 600 to 1,000 yuan per kilowatt, providing the best choice for the land-based "parity" era.

 Subsequently, the unit will be transported to the test wind farm for hoisting, and mass production will be carried out after full test verification, making due contributions to accelerating the promotion of green and low-carbon development. Editor/XuNing、Design/WangXia