采用传输矩阵方法的多回超／特高压交流输电线路的电气不平衡度计算  

Calculation on Electrical Unbalance of Multi-circuit EHV/UHV Transmission Lines by Transmission Matrix

作　　者：施春华[1] 卢洵[1] 邹军[2] 袁建生[2] 

机构地区：[1]广东省电力设计研究院,广东省广州市510663 [2]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《电网技术》2012年第1期39-44,共6页Power System Technology

基　　金：2011年铁道部-清华大学科技研究基金资助项目~~

摘　　要：超/特高压输电线路不换位会导致电气参数不对称,进而使得线路电压、电流不平衡。线路不平衡度必须控制在一定范围内,准确预测输电线路电气不平衡度对输电线路设计、运行尤为重要。从多导体传输线模型出发,提出一种简单且解析的传输矩阵方法,并使用其他数值计算软件验证了该方法的正确性。进而将该方法应用于输电线路电气不平衡度计算,有效提高不平衡度计算的准确性。并分析了传输矩阵方法、相模变换方法以及Π模型方法三者之间的误差,验证了传输矩阵方法的正确性。最后使用传输矩阵方法计算了双回输电线路的电气不平衡度,对线路结构设计、换位长度的选取等有重要意义。Unsymmetric electric paramters oJ non-transposed EHV/UHV transmission lines lead to unbalanc~ of voltage and current and it affects normal operation of load,~ located at the end of tranmsission lines, thus the degree of lin~ unbanlance have to be restricted within a certain range, and it i,, especially important for the design and operation oJ transmisssion line to accurately calculate the unbalance. Basec on multi-conductor transmission line （MTL） model a simpk and analytic method to calcualte the degree of transmission lin~ unbalance by transmission matrix is proposed and th~ correctness of the proposed method is verified by calculatior results with phase-mode method and 17 model. Calculatior errors of the proposed method, phase-mode method and Iq model method under different line lengths are analyzed Applying the proposed method to the calculation of electrical unbalance in transmission lines the accuracy of unbalanc~ calculation can be effectively imporved. Finally, the electrica unbalance of double-circuit transmission line is calculated b3 the proposed method.

关 键 词：线路不平衡度 传输矩阵 多导体传输线 相模变换 Π模型 

分 类 号：TM72[电气工程—电力系统及自动化]