区域电网电磁暂态等值及短路电流直流分量分析

何泽宇; 陈小月; 张杏子; 文习山; 张锋; 亢朋朋

何泽宇,陈小月,张杏子,文习山,张锋,亢朋朋.区域电网电磁暂态等值及短路电流直流分量分析[J].电测与仪表,2020,57(20):10-15.
hezeyu,chenxiaoyue,zhangxingzi,wenxishan,zhangfeng,kangpengpeng.Analysis of DC component of electromagnetic transient equivalent and short circuit current in regional power grid[J].Electrical Measurement & Instrumentation,2020,57(20):10-15.

区域电网电磁暂态等值及短路电流直流分量分析

Analysis of DC component of electromagnetic transient equivalent and short circuit current in regional power grid

DOI：10.19753/j.issn1001-1390.2020.20.002

中文关键词: 直流分量电磁暂态时间常数折算电阻型超导限流器

英文关键词:DC component, electromagnetic transient, time constant conversion, resistive superconducting current limiter

基金项目:

作者中文名	作者英文名	单位
何泽宇	hezeyu	武汉大学电气与自动化学院
陈小月	chenxiaoyue	湖北工业大学电气与电子工程学院
张杏子	zhangxingzi	武汉大学电气与自动化学院
文习山	wenxishan	武汉大学电气与自动化学院
张锋	zhangfeng	国家电网新疆电力有限公司
亢朋朋	kangpengpeng	国家电网新疆电力有限公司

摘要点击次数: 1677

中文摘要:

西北电网电源接入密集、电压级差大，容易引起短路电流超标。但常规限流措施会增大短路电流直流分量的衰减时间，影响断路器的开断能力。文中针对我国西北某大级差、电源密集型电网，搭建了多节点复杂电网发生短路时电磁暂态的等值简化计算模型。在该模型的基础上研究了短路电流直流分量对断路器开断能力的影响，分析了直流分量衰减时间常数折算的方法，并在采取常规限流措施的基础上计算了加装电阻型超导限流器对超标厂站直流分量的抑制效果。结果表明：直流分量的衰减时间常数不能直接作为断路器选型的依据，需要将其折算至标准规定的试验基准值下；电阻型超导限流器可以有效地抑制加装位置附近回路的短路电流直流分量，加装后时间常数下降25%左右，但是对电气距离较远的厂站抑制作用较弱。文中的结论能为断路器的合理选型以及限流新技术的应用提供参考意义。

英文摘要:

The current situation of dense power supply and large voltage level difference in northwest power grid is easy to cause short-circuit current overshoot. The commonly used current limiting measures will increase the attenuation time constant of the DC component of the short circuit current and affect the breaking capacity of the circuit breaker. This paper presents a simplified model of electromagnetic transient in the case of short-circuit in a complex multi-node power grid with large voltage level difference and intensive power supply in northwest China. On the basis of this model, the influence of DC component on the breaking capacity of circuit breakers is studied, the method of time constant conversion of DC component of short-circuit current is analyzed, and the restraining effect of resistance superconducting current limiter on short-circuit current of overstandard factory station is calculated. The results show that the decay time constant of the DC component needs to be converted to the test base value specified in the standard; Resistive superconducting current limiter can reduce the DC component time constant of the short-circuit current in the circuit near the installation location by about 25%, but it has a weak inhibition effect on the plant station with a long electrical distance. The conclusions in this paper can provide reference significance for the rational selection of circuit breakers and the application of new current limiting technology.

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