Hello, there is basically no difference between a doubly fed generator and a wirewound asynchronous generator. It must be said that the principle is the same and the structure is the same. It's basically the same thing with different names. To be precise, doubly fed generators are a special type of wound-type asynchronous generators. The main objectives are slightly different. Double-fed generators are powered by a rotor-side frequency converter. a resistor connected to the side of the rotor to adjust the speed. Since the inverter power supply has high frequency harmonics and impacts, the dual-fed generator will take more care of insulation and growth when designing the motor body than the asynchronous generator with conventional winding. generator. Large inductance is used to improve the filtering effect, and as the confrequency inverter has a certain voltage level, in order to fully utilize the capacity of the frequency converter, the voltage of the double-fed generator rotor must match the frequency. converter during design. Generally speaking, the doubly fed generator will be larger than the conventional wound type asynchronous generator which is designed to be larger. For example, the rotor voltage of a doubly powered motor used in wind power is 690 V, while that of the conventional wound asynchronous generator is over 300 V.
Essentially, it does not There's no big difference between the two. The main differences in application scenarios lead to some changes in some small places.
Double-powered wind turbines are currently the most widespread on the market and the technology is relatively mature. However, they present many challengesfaults, notably 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.