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| 摘要: |
| 电气化铁道供电牵引网区间增加串联电容补偿装置,当线路发生故障时,短路电抗与故障距离对应关系遭到了破坏。通过对该种类型牵引网馈线故障模型和短路特性的研究,对比了短路故障引起电压变化的基于几种形态学梯度的检测方法,提出了一种基于二阶形态学梯度检测电容放电间隙短路的方法。根据某区间含串联电容补偿装置的电气化铁路牵引网的情况,对不同的电容电压相角和不同过渡电阻条件下的ATP仿真以及Matlab程序分析结果验证,基于二阶形态学梯度的方法能正确识别电容放电间隙短路。结合该识别方法和已有文献所述的电容参数识别的判别故障点在区间电容前或电容后的方法,最后根据傅里叶算法计算的短路电抗值,实现基于电抗法的查表测距。 |
| 关键词: 供电牵引网,串联电容补偿装置,数学形态学,形态学梯度 |
| DOI： |
| 分类号:TM922.3 |
| 基金项目: |
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| Fault locating of traction power system with series-wound compensators based on morphological gradient and parameter identification |
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LIN Guosong GAO Shibin LI Qunzhan
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| Abstract: |
| The series-wound compensators are added in traction power system of some electric railway,which damages the corresponding relation between short-cireuit reactance and fault distance when fault occurs.The fault model and short-circuit characteristic of this type of traction power system are studied and several fault locating methods based on morphological gradient for the induced voltage changes are compared.A fault locating method based on second-order morphological gradient for the short-circuit at capacitor discharge moment is proposed.ATP simulation and Matlab analysis for different capacitor voltage angles and different transitional resistances of a traction power system with series-wound compensators show that,the proposed method can identify the short-circuit fault at capacitor discharge moment.Combined with the way of judging whether the fault is before or behind series-wound compensator by capacitor parameters and the calculated short-circuit reactance by Fourier transform,the fault is located using the relation table between reactance and distance. |
| Key words: traction power system,series - wound compensators,mathematical morphology,mor -phological gradient |
