计及线间互感的两回输电线路交叉跨越故障的短路电流计算方法

发布时间：2018-05-03 12:19

本文选题：线间互感 + 输电线路　；参考：《南方电网技术》2017年09期

【摘要】：对于计及线间互感的两回输电线路,现有故障分析方法对于不同类型故障,大多要构建不同的复合序网,工作量太大且难以排错。为此,本文提出一种计及线间互感的两回输电线路短路电流计算方法。以故障相关线路的阻抗以及两端的节点阻抗矩阵作为输入,通过添加树支或连支对原节点阻抗矩阵进行参数修正或扩维,以处理线间互感或添加故障节点,进而构建两回输电线路在故障节点处的序网络方程。针对两回输电线路,给出构建故障边界条件矩阵的通用方法,并利用相序转换变换为各序网下的故障边界条件矩阵,联立序网络方程矩阵求解故障各端口的电压和电流。最后,利用PSCAD/EMTDC构建电网故障仿真模型,仿真结果验证了该方法的正确性。
[Abstract]:For two-circuit transmission lines with mutual inductance between lines, most of the existing fault analysis methods have to construct different composite sequence networks for different types of faults, and the workload is too large and difficult to troubleshoot. In this paper, a calculation method for short circuit current of two circuit transmission lines is presented, which takes into account the mutual inductance between lines. Taking the impedance of the fault correlation line and the node impedance matrix at both ends as input, the original node impedance matrix is modified or expanded by adding tree support or connecting support to deal with mutual inductance between lines or add fault nodes. Then the order network equation of two-circuit transmission line at the fault node is constructed. A general method of constructing fault boundary condition matrix for two-circuit transmission lines is presented. The phase sequence transformation is transformed into the fault boundary condition matrix under each sequence network, and the simultaneous sequence network equation matrix is used to solve the voltage and current of each fault port. Finally, the fault simulation model of power network is constructed by using PSCAD/EMTDC, and the simulation results verify the correctness of the method.
【作者单位】：华南理工大学电力学院;直流输电技术国家重点实验室(南方电网科学研究院);
【基金】：国家自然科学基金资助项目(51307065)~~
【分类号】：TM713;TM75

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