摘要
为了研究±1 100 k V直流滤波器典型故障过电压的特点及其相应的保护措施,针对±1 100 k V昌吉-古泉直流输电工程,利用PSCAD计算并分析了双极全压运行方式、单极大地回线和单极金属回线运行方式下直流滤波器短路、滤波器高低压电容器组分别击穿等滤波器典型故障产生的过电压及其暂态特性,并在最具代表性的故障情况下,研究了避雷器对过电压特性的影响。基于此,进一步研究了保护控制策略对过电压与能量的影响。结果表明,整流侧发生直流滤波器短路故障时,过电压更为严重;单极金属回线下发生直流滤波器短路故障时,过电压更为严重且避雷器吸收能量过大;增设避雷器与保护控制后,关键节点的过电压值均低于该处的绝缘水平,避雷器吸收的能量也未超过其吸收能力。
In order to study the typical fault overvoltage characteristics of ±1 100 kV DC filter and its protection measures,this paper uses PSCAD simulation software to calculate the DC filter short circuit,C1 and C2 breakdown in the bipolar full voltage operation mode,unipolar-ground line operation mode and unipolar-metal line operation mode in the background of ±1 100 kV Changji-Guquan UHVDC Transmission project. Besides,the transient overvoltage of the arrester is calculated under the most representative fault condition. Based on this,the impact of protection control strategies on overvoltage and energy is further studied. The results show that the overvoltage is more serious when the DC filter short-circuit fault occurs on the rectifier side;when the DC filter short-circuit fault occurs under the unipolar-metal operation mode,the overvoltage is more serious and the arrester absorbs more energy. After the arresters and protection control,the overvoltage values of the critical nodes are lower than the insulation level at the location,and the energy absorbed by the arresters does not exceed its capacity.
作者
吴钰颖
郭洁
WU Yuying;GUO Jie(School of Electrical Engineering,Xi′an Jiaotong University,Xi′an 710049,China)
出处
《电力工程技术》
2020年第1期130-137,共8页
Electric Power Engineering Technology
基金
国家电网有限公司总部科技项目(5210EF1800-0S)
关键词
特高压直流输电
运行方式
直流滤波器
暂态过电压
保护控制策略
PSCAD
ultra high voltage direct current(UHVDC) transmission
operation mode
DC filter
transient overvoltage
protection control strategy
power systems computer aided design
