双馈异步发电机与同步发电机的比较

An other advantage of the full scale converter is its behaviour when the grid voltage changes very fast.
网侧变流器的另外一个优点是：当网格电压变化非常快时，变流器的特性。

Double feed systems work well if the grid voltage and frequency is very stable. If you use a double feed system the current of the generator side IGBT increases to 4 times of the nominal current, when the grid voltage is changing suddenly from 100% to 60%. Also the torque at the generator shaft increases to 4 times of the nominal torque which can damage the gearbox. If you do not want to take very big IGBTs you have to use a crowbar at the generator side to protect the system against over voltage.
当网格电压和频率很稳定时，双馈系统工作的很好。在使用双馈系统时，当网格电压突然从100％变到60％时，发电侧IGBT电流就会增加到额定电流的4倍，同时发电机轴的力矩也会增加到额定力矩的4倍，这时就会毁坏齿轮箱。如果你不想用非常大的IGBT的话，又想使整个系统在过压时不被破坏，那么你不得不在发电侧用一个短路器。
We must consider the life time for IGBTs in Windmill application. High load cycle
Capability is necessary to improve the reliability of windmill drives. SKiiP technology (no copper base plate, pressure technology) is very popular for this application. Semikron is dominating in this field.
在风力发电应用中，我们必须考虑IGBT的使用寿命。为了提高风力发电驱动器的可靠性，IGBT必须具备高负载周期的能力。在此应用中，SKIIP（没有铜基板，压接式技术）技术非常风行，在风力发电行业里面，赛米控占据主导地位。

In the following table we try to compare the systems :
在下表中，我们来比较两个系统：