同塔四回不对称参数线路的相模变换  

Phase-Mode Transformation of Asymmetry-Parameter Four-Parallel Lines on the Same Tower

作　　者：刘琦[1] 邰能灵[1] 范春菊[1] 于仲安[2] 尚瑨[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]江西理工大学电气工程与自动化学院,赣州341000

出　　处：《电工技术学报》2015年第18期171-180,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51177066;51377104)

摘　　要：同塔多回线中线路自阻抗的不对称增大了矩阵解耦的难度,参数不对称同塔四回线为电力系统的故障分析带来新的挑战。在对以往同塔多回线相模变换进行大量研究的基础上,根据同塔四回线相模变换的特点,提出了基于线相解耦法的相模变换与基于相线解耦法的相模变换,这两种解耦方式对参数不对称的同塔四回线进行解耦。从变换矩阵的特性探索了这两种相模变换所表现的物理意义,从数学角度分析了相模变换解耦过程的顺序性与可逆性,并且从相模变换的数学方程与物理意义讨论了相模变换的适用性,对相模变换矩阵进行了推广应用。仿真结果表明此方法能够较准确地计算线路的故障电流,并能很好地适用于不对称线路的故障分析。Due to the asymmetrical self-impedance of the multi-circuit lines, it becomes much more difficult to decouple the network equation and brings new challenges for fault analysis with four-parallel lines on the same tower. According to the studies of existing phase-mode transformation and the characteristics of the four-parallel-line phase-mode transformation, two new decoupling methods are proposed to decouple the asymmetrical impedance matrix. One is to decouple the matrix with the original decouple steps, while the other uses the contrary order. The physical meanings of the two phase-mode transformations are discussed according to the characteristics of the transformation matrix, and their mathematical calculation is deduced to explore the sequentiality and the reversibility of the decouple steps. Applicability of the phase-mode transformations is explained according to their physical meanings and mathematical equations, and the phase-mode transformation form is also generalized. The simulation results indicate that the new method is suitable for the fault analysis involved in four-parallel lines with asymmetrical self-impedance.

关 键 词：同塔四回线 不对称线路 相模变换 解耦 矩阵变换 

分 类 号：TM773[电气工程—电力系统及自动化]