Cost reduction and efficiency increment of induction generator system for wind power generation at lower wind speed without using rare-earth materials

感应发电机是风力发电中最受欢迎和成本最低的机器。但是，它不能在低于同步速度的情况下发电。因此，有时需要安装带变频系统的永磁同步发电机。但是，机器的成本要比感应电机高得多。强磁体需要稀土材料，其成本在不久的将来可能会变得很高。因此，我建议使用感应发电机与电压源转换器（VSC）。研究结果证实，VSC额定值下降到额定输出功率的17%。

The induction generator is the most popular and the lowest cost machine for wind power generation. However it cannot generate power at lower speed than the synchronous speed. So、 sometimes、 the permanent magnet synchronous generator with frequency conversion system is installed. However、 the cost of the machine is much higher than the induction machine. And the strong magnets require rare earth material whose cost may be going high in near future. Hence I have proposed to use the induction generator with voltage source converter (VSC) . The research results verify the VSC rating is down to 17% of rated power output.