一种直流避雷器老化试验用纹波功率电源设计

Design of Ripple Power Source for DC Arrester Aging Test

直流避雷器的可靠性直接关系到高压直流输电系统的可靠运行,老化试验是检验直流避雷器可靠性的关键试验之一。目前国内外试验设备无法带负载输出理想的试验电压波形。通过分析6脉动和12脉动换流器避雷器老化试验纹波电压波形的产生方法,并考虑触发角和换相角对不同试验电压波形的影响,研制了一种可多个模块串联的纹波功率电源。在带负载情况下可输出任意触发角和换相角下纹波波形,单模块电压有效值达到1 kV以上。在长达1000 h带负载试验中电压波形无畸变,换相过程明显,换相过冲幅值稳定,输出电压满足各型号直流避雷器老化试验的要求。

The reliability of DC arresters is directly related to the reliable operation for HVDC transmission system,the aging test is the main measure to obtain the reliability of arresters,and therefore,is of great importance.The test voltage with ideal waveforms had not been produced before by any of the test equipment when it is loaded.By analyzing the generation method of ripple voltage waveform in aging test of 6 and 12 pulse converter arresters,and considering the influence of trigger angle and commutation angle on different test voltage waveform,a ripple power source with multiple modules in series was developed.Under the condition of load,the ripple waveform of any trigger angle and commutation angle can be output,and the effective value voltage of the single module is more than 1 kV.The device went through 1000 h of test,and commutation process can be seen in the oscillograph clearly,including stable commutation overshoot.The oscillograph also shows that the fundamental frequency of the waveform is stable,and waveform distortion is small and can be ignored.The output voltage meets the requirements of aging test for various types of DC arresters.