双馈式风力发电机变流器脉冲电压对绝缘寿命的影响

为了研究变流器输出频率比较高时,其直流重复脉冲电压对电机绝缘系统寿命的影响,对双馈式风力发电机定子进行了模拟试验。试验结果证明:与工频50Hz交流电压相比,开断频率为1kHz时的脉冲电压作用下的绝缘寿命相差约20倍;决定绝缘寿命的主要因素是局部放电,变流器输出频率越高,则绝缘寿命越短。

Effects of Converter Pulse Voltage on Insulation Life of Doubly-fed Wind Generators

To study the effects of DC repetition pulse voltage of converter on service life of corresponding generator insulation system under conditions of high output frequency of the converter, a simulation test was conducted to the stator of a doubly-fed wind generator. Test results indicate that the insulation life under the effect of a pulse voltage with cut-off frequency of 1 kHz is about 20 times different from that under a 50 Hz AC voltage; the main factor influencing the insulation life is the local discharge; the higher the output frequency of the converter, the shorter the insulation life.