六相输电系统的故障暂态分析  

Fault Transient Analysis of Six-phase Power Transmission System

作　　者：张艳霞[1] 张宏远[1] 孙莹 

机构地区：[1]智能电网教育部重点实验室天津大学,天津300072 [2]中国能源建设集团天津电力设计院,天津300400

出　　处：《电力系统及其自动化学报》2015年第4期49-54,共6页Proceedings of the CSU-EPSA

摘　　要：六相输电能提高输送功率密度,降低杆塔建设成本,环境指标优于同塔双回线。针对六相输电故障分析主要集中于稳态的研究现状,该文对其故障暂态特性进行了深入分析,利用解耦变换矩阵将故障后的六相系统电压电流转换为六序分量,结合输电线路π型等值电路建立了六序网络的暂态模型。分别推导了频域下考虑线路分布电容、串补电容及并联电抗器的故障暂态电流表达式。与同塔双回线相比,六相系统的故障暂态过程更复杂,谐波频率更高,衰减更迅速。最后利用PSCAD建立六相输电系统模型验证了分析的正确性。Six phase transmission can increase the transmission power density, and reduce the cost of tower construc- tion, environmental indicators better than double circuit lines on the same tower. Due to the six-phase transmission fault analysis mainly focuses on the steady state situation, this article makes deep analysis on its fault transient, using decoupling transformation matrix to transform the faulted six-phase power transmission system into six sequence com- ponents, combined with the T-type equivalents circuit , the six-sequence transient model was established. Then it de- duces the formula of fault transient current under the condition of distributed capacitance ,capacitor of series compen- sation or shunt reactors. Compared with double-circuit lines on same tower, the six-phase power transmission system fault has higher frequency harmonic and decays more quickly. At last simulation software PSCAD is used to establish the model of six-phase power transmission system and verify the validity of the analysis.

关 键 词：六相输电线路 解耦变换 暂态分量 频谱分析 

分 类 号：TM71[电气工程—电力系统及自动化]