混压同塔四回线强电弱磁系统跨电压不接地故障短路计算

发布时间：2018-04-19 13:14

本文选题：强电弱磁 + 跨电压故障　；参考：《电力系统自动化》2017年15期

【摘要】：目前对于同塔四回线路的研究多基于十二序分量法,然而十二序分量法矩阵阶数较高,计算复杂,且仅适用于线路参数对称的情况。提出一种基于经典对称分量法的故障分析新方法,将混压同塔四回线强电弱磁系统分为强电联系的等效电流源系统及弱电强磁系统两部分;然后,分别计算两部分电源提供的短路电流;最后将两部分故障电流叠加,得到强电弱磁系统的故障电流,避免了高阶矩阵运算,物理概念清晰,可实现跨电压不接地故障电流的准确计算。在PSCAD中搭建500kV/220kV混压同塔四回线不同类型不接地故障模型,仿真与计算结果相比较,验证了所述方法的正确性。
[Abstract]:At present, most of the researches on the same tower four-circuit line are based on the 12-order component method. However, the 12-sequence component method has the advantages of high order of matrix, complicated calculation, and only suitable for symmetrical transmission line parameters.A new fault analysis method based on classical symmetric component method is proposed, in which the four circuit strong and weak magnetic field system of the mixed voltage and the same tower is divided into two parts: the equivalent current source system with strong electric connection and the weak current strong magnetic system.The short-circuit current provided by the two parts of the power supply is calculated separately. Finally, the fault current of the strong electric-weak magnetic system is obtained by superposing the two parts of the fault current, avoiding the high-order matrix operation, and the physical concept is clear.It can realize the accurate calculation of cross voltage ungrounded fault current.The different types of ungrounded fault models of four circuit lines of 500kV/220kV mixed-pressure tower are built in PSCAD. The results of simulation and calculation verify the correctness of the proposed method.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);国电南瑞科技股份有限公司;国网宁夏电力公司;
【基金】：国家重点研发计划智能电网技术与装备重点专项项目(2016YFB0900604)~~
【分类号】：TM75

【参考文献】