双馈异步发电机与同步发电机的比较

In picture 1 we can see the circuit of the system using a synchronues generator, a diode rectifier, a dc-link step-up-chopper and an IGBT converter.
在图1中，我们可以看到该系统的电路：同步发电机，二极管整流桥，连接在直流母线上的升压器，一个IGBT变流器。

In picture 2 we can see an asynchronues generator with slip rings, an IGBT rectifier, a dc-link, and an IGBT converter. This system is used by some other companies.
在图2中，我们可以看到：一个带滑环的异步发电机，IGBT整流桥，直流母线，IGBT变流器。有一些公司使用该系统。

In Germany the first big wind turbine with variable speed had been developed in 1980 (3mW, 100m rotor diameter), but the project was to big an was not successful because of mechanical problems. At this time the cost for power semiconductors was very high, so the turbine used a double feed asynchronues generator with a small slip to save converter cost.
在德国，第一台大型的变速风力发电（3兆瓦，转子直径达10米）设备诞生于1980年，但是由于机械问题，该项目并不是很成功。那时候，电力器件的成本相当的高，因此，风力发电设备就经常采用带小滑差的双馈异步发电机来节省变流器的成本。
Commercial wind turbines with variable speed with 750kW and more had been developed in Denmark and Germany since 1995.
真正用于商业运行的750kw变速甚至更大的风力发电设备在1995年诞生于丹麦和德国。
The Danish manufacturers had been starting with constant speed turbines. This is mainly because the wind in Denmark is more constant compared to Germany. But for turbines above 1 MW they also started to take variable speed because of problems they had with the gearboxes. But first the Danish manufacturers also used a small slip and therefore a double feed system seemed more economical.
丹尼斯设备厂开始时设计恒速风电设备。这主要是由于跟德国相比，丹麦的风速比较稳定。但是对于1兆瓦以上的风电设备，由于齿轮箱设计的问题，他们也开始采用变速方案。但是刚开始时，丹尼斯设备厂仍采用小滑差，所以双馈系统也就比较经济。
In 1988 the first 50kW turbine using a synchronues generator and an 6 pulse thyristor converter. Later used 12pulse converters, but this technique could not be used further on because of harmonic distortion.
1988年，第一台50千瓦的风力发电设备是采用同步发电机和六脉冲可控硅变流器。后来，采用12脉冲变流器，但是由于谐波失真的缘故，后来这种技术就没有再持续。

Started in 1993 with a 750kW double feed system. Many problems with the slip rings. The generator which was produced by a big Austrian company had to be changed 5 times and still did not run more than two months. After one year they gave up the double feed system and changed it to an synchronues generator. We found that the cost of the converter was not more than the double feed system because the construction is more simple.
开始于1993年的750千瓦双馈异步系统，其中的滑差环一直存在问题，由澳大利亚一家大公司生产的发电机也修改了5次，但是运行时间仍旧不到两个月。一年以后，他们放弃了双馈异步系统，并把异步发电机换成同步发电机。我们发现，由于同步系统的结构变得更加简单，因此同步系统变流器的成本并没有比双馈异步系统的高。