MMC与混合式直流断路器开关操作的瞬态电场实测及其在状态监测中的应用  

Transient Electric Field Caused by the Operation of the MMC and HVDC CB and Its Application in the Condition Monitoring

作　　者：孔旭 李跃波 刘黎[2] 樊淑娴 KONG Xu;LI Yuebo;LIU Li;FAN Shuxian(Research Institute for National Defense Engineering of Academy of Military Sciences PLA China,Luoyang 471023,Henan Province,China;Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education,Department of Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China;College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,Shandong Province,China)

机构地区：[1]军事科学院国防工程研究院工程防护研究所,河南省洛阳市471023 [2]电力传输与功率变换控制教育部重点实验室(上海交通大学电气系),上海市闵行区200240 [3]山东科技大学电气与自动化工程学院,山东省青岛市266590

出　　处：《中国电机工程学报》2023年第23期9010-9019,共10页Proceedings of the CSEE

摘　　要：文中对换流站中模块化多电平电压源型换流器(modularmultilevel converter,MMC)和混合式直流断路器中IGBT开关操作产生的瞬态电场进行实测,并分析其在设备状态在线监测中的应用。首先,证明换流站中开关瞬态电场属于准静态场,且与设备电压之间存在线性关系,为基于开关瞬态电场状态监测方法提供理论基础。进一步,在舟定换流站人工短路试验中,对MMC高频电场波形和直流断路器开关瞬态电场脉冲进行实测。分析MMC不同工作状态下高频电场信号特征,特别发现高频电场信号中包含通过换流站自带录波系统不易测量的高次谐波信息。另一方面,发现基于开关电场脉冲的陡峭脉冲前沿,可测量MMC和直流断路器闭锁时刻,误差小于0.005ms。因此,基于瞬态电场测量方法可以在一定程度上弥补换流站自带录波系统测量带宽有限的缺点,补充系统高次谐波等运行信息,提高设备闭锁时刻测量精度,在MMC和高压直流断路器等设备在线状态监测中具有潜在应用价值。The transient electric field(Erield)generated by the switching operation of the IGBT of the modular multilevel converter(MMC)and hybrid DC circuit breaker(CB)in the converter station is measured.Moreover,its application in the on-line condition monitoring of the equipment is analyzed.First,it is proved that the switching transient Erield in the converter station is a quasi-static field and it has a linear relationship with the equipment voltage.This provides the theoretical basis for the condition monitoring method based on the switching transient Erield.Furthermore,in the artificial short-circuit test of Zhouding converter station,the high-frequency Ereld waveforms of the MMC and the switching transient Ereld pulses of the DC CB are measured.The characteristics of the high-frequency Erield signal under different working conditions of MMC are analyzed.It is found that the high-frequency Eield signal contains the high-order harmonic information that is not easy to measure by the self-contained waveform recording system of the converter station.On the other hand,it is found that based on the steep pulse front of the switching Efield pulse,the blocking moment of MMC and DC CB can be measured with an error of less than 0.005ms.Therefore,the measurement method based on transient electricfield can make up for the limited measurement bandwidth of the self-contained waveform recording system of the converter station to a certain extent.It can supplement the high-order harmonics and other operating information of the system and improve the measurement accuracy of the blocking moment of the MMC and CB.It has potential application value for online condition monitoring of the MMC,HVDC CB and other equipment.

关 键 词：在线状态监测 瞬态电场环境 混合式高压直流断路器 高压直流输电 模块化多电平换流器 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]