Double-powered wind turbines are currently the most widespread on the market and the technology is relatively mature. However, they have many defects, including the gearbox, which increases the complexity of the system and maintenance costs.
The direct-drive wind turbine is an emerging type of generator that eliminates the need for a gearbox and can achieve greater power generation efficiency at low wind speeds.
Currently, multinational giants are developing direct drive wind turbines. And a 1.5 MW direct drive wind turbine has been put into mass production.
The difference between 1.5MW and 3.0MW wind turbines
There are nine main brands of Yuchai generator sets circulating in the domestic market: Weichai and Shangchai, Yuchai , Jichai, Wudong, Cummins, Daewoo and Volvo; Cummins is a Chinese-American joint venture brand, Dongfeng Cummins and Chongqing Cummins respectively, Daewoo (South Korea) and Volvo (Sweden) are imported brands, and the remaining 5 brands are purely domestic.
The main difference is the wind power generation capacity. 3.0 is twice that of 1.5 and can provide more power.
So regardless of size or internal components, the power level appears to be the same. be 2 times. relationship, the main components include;
Blades - with large surface area, they can generate large torque under the action of wind and do more work;
Generator- -blades Convert wind energy into mechanical energy to rotate the generator bearings, thereby using electromagnetic induction to generate the corresponding electrical energy. Currently, there are two main types of permanent magnet motors and dual-powered motors, which are suitable for general use.complete ion. -wind power and dual-fed wind power respectively;
Converter --- converts electricity with different frequencies from the generator into 50 Hz alternating current and feeds it into the power grid. two power units, a rectifier and an inverter, because the wind speed is unstable, so the frequency of electricity emitted by power generation is also not fixed (except for double-fed discharge machines ).
Generators and converters are the two most critical components of wind power, and they are also the bottleneck of domestic wind power design.