| 引用本文: | 余梦琪,杨增力,王友怀,等.计及牵引变压器的电网短路计算通用方法研究[J].电力系统保护与控制,2026,54(04):116-129.[点击复制] |
| YU Mengqi,YANG Zengli,WANG Youhuai,et al.A general method for power system short-circuit calculation considering traction transformers[J].Power System Protection and Control,2026,54(04):116-129[点击复制] |
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| 摘要: |
| 电力系统短路电流的正确计算是确保继电保护整定计算工作有效实施的前提。牵引变压器的接入使电网呈三相不对称特性。为统一高效地实现计及多种牵引变压器的电网短路计算，提出了一种可适用于含牵引变压器的电网通用短路故障模型。通过叠加故障修改节点导纳矩阵，该方法可以直接实现全网短路电压、电流的计算。首先，介绍了利用修改节点导纳矩阵进行电网故障计算的基本思路。然后，详细推导了单相、V/V、V/X、Scott以及阻抗匹配平衡牵引变低压侧短路时的故障修改节点导纳矩阵。最后基于IEEE9节点系统进行仿真，并与现有计算方法对比，验证了该方法的正确性。该方法已应用于实际电网的故障分析及继电保护整定计算软件中，具有较好的实用价值。 |
| 关键词: 电气化铁路 牵引变压器 电网短路计算 对称分量法 修改节点导纳矩阵 |
| DOI：10.19783/j.cnki.pspc.250232 |
| 投稿时间：2025-03-06修订日期：2025-07-20 |
| 基金项目:国家自然科学基金项目资助(52207107) |
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| A general method for power system short-circuit calculation considering traction transformers |
| YU Mengqi1,YANG Zengli2,WANG Youhuai2,WANG Jing2,ZHANG Zhen2,WANG Jingyu1,SHI Dongyuan1 |
| (1. State Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology,
Wuhan 430074, China; 2. State Grid Hubei Electric Power Co., Ltd., Wuhan 430074, China) |
| Abstract: |
| Accurate calculation of short-circuit currents in power systems is fundamental to the effective implementation of relay protection setting calculations. The integration of traction transformers introduces three-phase asymmetry into the power grid. To achieve a unified and efficient approach for short-circuit calculation in power systems containing various types of traction transformers, this paper proposes a general short-circuit fault model for power grids with traction transformers. By superimposing fault modified the nodal admittance matrix, the method can directly calculate the short-circuit voltages and currents throughout the entire network. First, the basic concept of power system fault analysis using a modified nodal admittance matrix is introduced. Then, the fault-modified nodal admittance matrices for low-voltage side faults of single-phase, V/V, V/X, Scott, and impedance-matched balanced traction transformers are derived in detail. Finally, the correctness of the proposed method is demonstrated by simulations based on the IEEE9-bus system and comparison with the existing calculation methods. The method has been applied in practical power grid fault analysis and relay protection setting calculation software, demonstrating good practicality and engineering value. |
| Key words: electrified railway traction transformer power system short-circuit calculation symmetrical component method modified nodal admittance matrix |
