摘要
为了提取雷击引起的电压凹陷特征,分析与普通短路故障引起电压凹陷的区别,使用基于电磁暂态仿真系统PSCAD/EMTDC仿真了雷击引起的电压凹陷与普通短路故障引起的电压凹陷。以IEEE RBTS-6标准测试系统作为仿真对象,考虑了母线是否加装避雷器两种情况。研究表明,无论在哪种短路故障情况下,雷击引起的电压凹陷与普通短路故障电压凹陷相比,凹陷深度一致,持续时间略短,且两者的凹陷波形特征不同。母线设置避雷器后,雷击引起的电压凹陷持续时间增加,但短于普通故障引起的电压凹陷持续时间,说明系统的保护装置会影响电压凹陷的特征。现有电能质量监测仪器可监测母线电压波形,为通过电压波形分析辨识引起凹陷的原因提供了理论基础。
In order to identify the difference of the voltage sags characteristic due to each type fault caused by common short circuit and lightning stroke, on the basis of globally-used electromagnetic transient simulation program PACAD/EMTDC, A new simulation approach to extract the magnitude and its duration of voltage sags to distinguish difference matters was proposed. The characteristics of voltage sag due to common short circuit faults and lightning stroke were simulated and compared each other. The IEEE RBTS-6 as a standard testing system was used in order to illuminate the run-of-mill principle. For two cases, having lightning arresters or not at the power system buses, the bus voltage sags wave characteristics were researched respectively. The simulation results show that the magnitudes of voltage sag are almost at the same level for common short circuit faults and lightning stroke, but the duration of voltage sag is shorter for the later because the protection device has its own acting time. Meanwhile, the voltage sag due to lightning stroke is different from due to common short circuit. In the presence of lightning arresters, the duration of voltage sag will increase but be shorter than short circuit, it proves that the protection equipment affects the characteristic of voltage sag in power system. The voltage wave sampled by the power quality monitors at busses can be used to distinguish the reasons of voltage sags.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第2期309-314,共6页
High Voltage Engineering
基金
四川省重点科技攻关项目(02GG021-025)~~
关键词
雷击
短路故障
电压凹陷
避雷器
波形特征
PSCAD/EMTDC
lightning stroke
short-circuit fault
voltage sag
lightning arrester
characteristic of voltage sag wave
PSCAD/EMTDC
