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首页> 外文会议>2013 International Conference on Power, Energy amp; Control >Effect of voltage sag on ageing of front end rectifier diodes of ASD
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Effect of voltage sag on ageing of front end rectifier diodes of ASD

机译：电压骤降​​对ASD前端整流二极管老化的影响

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Adjustable-speed drives are the type of equipment most sensitive to voltage sags. This paper analyzes the behaviour of front end rectifier of three-phase ac adjustable-speed drives during balanced and unbalanced sags. Emphasis is placed on the i2t rating of diode assuming that the drive will not trip. By using a previously introduced classification of three-phase balanced and unbalanced sags, i2t curves for various capacitor values and different sag conditions are obtained for ac adjustable-speed drive. The conclusion from the analysis is that voltage sags due to three-phase faults are a serious problem for adjustable-speed drives. However, single-phase and phase-to-phase faults, causing the majority of voltage sags, can be tolerated up to 80% of voltage sag for type C & F sag. While higher value capacitor is selected for enhancing voltage sag ride through, at the same time the bridge rectifier diode I2t value should also be selected such that it should not cross the diode I2t limit during sag and sag recovery duration.
机译：调速驱动器是对电压骤降最敏感的设备类型。本文分析了三相交流调速变频器的前端整流器在平衡和不平衡下垂时的行为。假设驱动器不会跳闸，则重点放在二极管的i 2 t额定值上。通过使用先前介绍的三相平衡和不平衡骤降的分类，对于交流调速驱动器，可以获得各种电容器值和不同骤降条件的i 2 t曲线。分析得出的结论是，三相故障引起的电压暂降对于变速驱动器来说是一个严重的问题。但是，导致大多数电压骤降的单相和相间故障最多可以容忍C和F型骤降的电压骤降的80％。虽然选择了较高值的电容器来增强电压降流过的能力，但同时还应选择桥式整流二极管I 2 t的值，以使其不与二极管I 2 < / sup>下垂和下垂恢复期间的极限。

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