输电线路不换位引起的不对称问题及其改进方法  

Asymmetric issues caused by un-transposed transmission lines and its solution

作　　者：陶凯[1] 刘明波[1] 

机构地区：[1]华南理工大学电力学院,广东省绿色能源技术重点实验室,广东广州510640

出　　处：《电力系统保护与控制》2010年第16期39-43,共5页Power System Protection and Control

摘　　要：当前短距离(通常输电距离在100 km以内)同杆并架输电线路面临的最大问题是由于不换位引起的三相参数不对称问题,进而导致三相电流不对称。以某实际220 kV环网系统作为算例,采用三相潮流计算和电磁暂态计算进行了三相不平衡现象模拟,验证了三相电流注入潮流计算方法在不平衡分析中的有效性。对不换位输电环网三相不平衡现象进行分析,提出采用逆相序反向换位方法可以改善三相参数不对称问题。The major obstacle nowadays in short-distanced（generally refers to distance less than 100 km） transmission line with two circuits on the same tower is the asymmetry of 3-phase current caused by the untransposition of transmission line.This paper simulates the 3-phase asymmetrical phenomenon in a 220 kV ring transmission system,using electromagnetic transient status and 3-phase power flow calculation method based on current injection,to demonstrate the validity of the 3-phase current injection method.T he result indicates that the asymmetrical phenomenon can be improved by the inverse transposition of each circuit with inverse order of the phase arrangement.

关 键 词：同杆双回线路 不换位 三相潮流 电磁暂态 逆相序反向换位 

分 类 号：TM75[电气工程—电力系统及自动化]