| 引用本文: | 兰 剑,王东旭,叶 曦,刘开培.故障线路单端跳闸条件下节点电压暂降幅值计算方法[J].电力自动化设备,2014,34(8): |
| LAN Jian,WANG Dongxu,YE Xi,LIU Kaipei.Calculation of voltage sag amplitude for single-terminal trip of faulty line[J].Electric Power Automation Equipment,2014,34(8): |
|
| 摘要: |
| 考虑继电保护装置动作对网络拓扑造成的影响，研究了保护装置动作造成故障线路单端跳闸而故障仍未消除情况下的电压暂降幅值的计算方法。首先分析了由于线路故障产生的虚拟节点与单端跳闸产生的伴随节点对电力网络拓扑结构变化的影响，基于此重构了电力网络的节点导纳矩阵与节点阻抗矩阵，利用这2个矩阵计算节点的电压暂降幅值。利用所提方法对IEEE 14节点系统的节点暂降电压进行了计算，计算结果和PSCAD仿真结果基本相同，验证了所提方法的正确性。 |
| 关键词: 继电保护 电压暂降 线路故障 故障分析 单端跳闸 阻抗矩阵 模型 计算 电力网络拓扑 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| Calculation of voltage sag amplitude for single-terminal trip of faulty line |
|
LAN Jian1,2, WANG Dongxu1,2, YE Xi1, LIU Kaipei1
|
|
1.School of Electrical Engineering，Wuhan University，Wuhan 430072，China;2.Wuhan Electric Power Supply Company，State Grid Hubei Electric Power Company，Wuhan 430072，China
|
| Abstract: |
| With the consideration of influence of relay protection on grid topology，a method of voltage sag amplitude calculation is proposed for the single-terminal trip of faulty line by relay protection while the fault is still exists. The influences of the virtual node produced by the line fault and the accompanied node produced by the single-terminal trip on the power grid topology are analyzed and the node admittance matrix and node impedance matrix are to reconstructed，based on which，the node voltage sag amplitudes are calculated. The node voltage sag amplitudes calculated by the proposed method for IEEE 14-node system are similar to those calculated by PSCAD simulation，verifying its validity. |
| Key words: relay protection voltage sag line fault failure analysis single-terminal trip impedance matrix models calculations electric network topology |
