Electrical Coupling Effects and Dynamic Control Strategy for Urban Rail Transit Power Supply Systems and Buried Pipelines
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摘要:
为研究城市轨道交通线路供电系统泄漏的杂散电流对城轨周边埋地金属管道的干扰及控制，对城轨供电系统与埋地管道电气耦合影响及动态控制策略进行分析. 首先，提出计及动态控制策略的城轨供电系统与埋地金属管道动态耦合参数计算模型，并基于实际线路参数对不同耦合场景下城轨供电系统参数及管道参数的动态分布进行仿真分析，阐明多回流路径耦合影响规律；其次，为解决城轨供电系统与管道电气耦合干扰问题，提出城轨供电系统与管道电气耦合动态控制策略，设计动态控制装置的结构，分析其控制特性；最后，以国内某城轨线路参数为例进行仿真分析，验证管道杂散电流及管地电位动态控制效果. 研究结果表明：城轨供电系统与周边管道电气耦合会造成城轨回流系统参数及管道安全参数升高，以仿真情况3为例，管道电位最大瞬时值可达16.2V，并且耦合效应与走行轨绝缘状态、管道绝缘状态及耦合位置处钢轨电位有关；动态控制策略能有效抑制城轨供电系统对管道的电气耦合影响，将管道电压钳位在标准限值范围内，并将管道杂散电流引回至城轨供电系统.
Abstract:To investigate the interference of stray currents from the power supply system of urban rail transit lines on adjacent buried metal pipelines and their control, the electrical coupling effects and dynamic control strategies between the urban rail transit power supply system and buried pipelines were analyzed. First, a dynamic coupling parameter calculation model integrating dynamic control strategies was proposed for the urban rail transit power supply system and buried metal pipelines. Based on actual line parameters, simulations were conducted to analyze the dynamic distribution of power supply system parameters and pipeline parameters under different coupling scenarios, clarifying the influence of multi-return-path coupling interactions. Second, to address the electrical coupling interference between the urban rail transit power supply system and pipelines, a dynamic control strategy was proposed, and the structure of a dynamic control device was designed, with its control characteristics analyzed. Finally, by using parameters from an actual urban rail transit line in China as an example, simulation analysis was performed to verify the dynamic control effect on pipeline stray current and pipe-to-soil potential. The results indicate that electrical coupling between the urban rail transit power supply system and adjacent pipelines leads to an increase in both the return system parameters of the urban rail transit and the pipeline safety parameters. By taking simulation case 3 as an example, the maximum instantaneous pipeline potential reaches 16.2 V. The coupling effect is related to the insulation condition of the running rails, the insulation condition of the pipeline, and the rail potential at the coupling location. The proposed dynamic control strategy can effectively suppress the electrical coupling impact of the urban rail transit power supply system on pipelines, clamp the pipeline voltage within the standard limits, and redirect the stray current on the pipeline back to the urban rail transit power supply system.
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Key words:
- urban rail transit /
- buried metal pipeline /
- stray current /
- electrical coupling /
- dynamic control
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图 1 城轨供电系统与管道耦合结构
Figure 1. Coupling structure of urban rail transit power supply system and pipeline
图 2 动态控制装置原理图及控制特性图
Figure 2. Principle of dynamic control device and control characteristic
图 3 城轨直流牵引供电系统多回流路径耦合仿真模型
Figure 3. Simulation model of multi-return-path coupling in direct current traction power supply system for urban rail transit
图 4 计及动态控制策略的多回流路径耦合参数计算流程
Figure 4. Calculation flow of multi-return-path coupling parameters considering dynamic control strategy
图 6 不同管道绝缘状态耦合时回流参数分布对比
Figure 6. Comparison of return system parameters under coupling with different pipeline insulation states
图 7 城轨回流参数及管道安全参数动态分布（情况3）
Figure 7. Dynamic distribution of return system parameters and pipeline safety parameters of urban rail transit （Case 3）
图 8 Sn为−1.5V时动态控制装置工作特性（情况5）
Figure 8. Operating characteristics of dynamic control device when sfn is −1.5 V （Case 5）
图 9 Sn为−1.5V治理前后系统参数动态分布（情况5）
Figure 9. Dynamic distribution of parameters before and after mitigation when Sn is −1.5 V （Case 5）
图 10 Sn=−1.0V时动态控制装置工作特性（情况5）
Figure 10. Operating characteristics of dynamic control device when sfn is −1.0 V （Case 5）
图 11 Sn=−1.0V治理前后管道参数动态分布（情况5）
Figure 11. Dynamic distribution of pipeline parameters before and after mitigation when Sn is −1.0 V （Case 5）
图 12 Sn=−1.5V治理前后系统参数动态分布（情况2、4）
Figure 12. Dynamic distribution of parameters before and after mitigation when Sn is −1.5 V （cases 2 and 4）
表 1 城轨直流牵引供电系统仿真参数设置
Table 1. Simulation parameters of direct current traction power supply system for urban rail transit
参数 数值 列车发车间隔/s 180 每站停留时间/s 30 仿真步长/s 1 整流机组空载电压/V 1 593 整流机组等效内阻/mΩ 16 再生制动能耗装置触发电压/V 1 800 单位长度接触网纵向电阻/（mΩ•km−1） 20 单位长度走行轨纵向电阻/（mΩ•km−1） 20 单位长度排流网纵向电阻/（mΩ•km−1） 20 单位长度走行轨对排流网电导/（S•km−1） 1/15 单位长度排流网对地电导/（S•km−1） 1/15 节点电压收敛精度/V 10−5 系统功率平衡收敛精度/kW 10−5 
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表 2 城轨与管道耦合时仿真参数设置
Table 2. Simulation parameters for coupling between urban rail transit and pipeline
情况 耦合位置/km yo1n/（S•km−1） yo2n/（S•km−1） yo3n/（S•km−1） 1 1 ～ 2 1/90 1/60 1/30 2 1 ～ 2 1/65 1/35 1/5 3 1 ～ 2 1/15 1/10 1/5 4 4 ～ 6 2/65 2/35 2/5 5 6 ～ 7 1/65 1/35 1/5
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