1. The direct-drive permanent magnet wind generator cancels the heavy speed-increasing gearbox, the generator shaft is directly connected to the fan shaft, the rotor speed changes with the wind speed and the frequency of its alternating current also changes. The high-power power electronic converter rectifies the alternating current of variable frequency into direct current and then inverts it into alternating current output with the same frequency as the power grid. The international advanced gearless direct-drive wind generators mostly use low-speed multi-pole permanent magnet generators and use a full-power inverter to send the frequency-changing wind power into the grid.
2. Improves the efficiency of capturing wind energy as it is designed to achieve greater aerodynamic efficiency in almost all wind conditions. Experiments show that when the average wind speed is 6.7m/s, the variable speed wind turbine captures 15% more wind energy than the constant speed wind turbine. At the same time, due to the reduction of the weight of the engine room and the improvement of the force of the various components of the transmission system, the supporting structure of the fan can be reduced, and the cost of the foundation and other costs can also be reduced, and the operation and maintenance costs are also lower. This is a very promising technology, belonging to the international frontier advanced project.