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| Multiple Reflux Paths Coupling Modeling for Urban Rail DC Traction Power Supply and Dynamic Distribution of Reflux Safety Parameters |
| Zheng Xin1, Du Guifu1, Li Qiaoyue2, Jiang Xingxing1, Huang Weiguo1 |
1. School of Rail Transportation Soochow University Suzhou 215131 China;
2. School of Optical and Electronic Information Suzhou City University Suzhou 215104 China |
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Abstract DC traction power supply systems are usually adopted in urban rail transit. Rail potential and stray current are the reflux safety parameters of the system, which have become the key problems affecting the safe operation of urban rail lines. Excessive rail potential seriously affects the safety of traction power supply system, and stray current will flow through the surrounding ground and buried metal pipeline, causing serious electrochemical corrosion to the key buried metal projects around. With the deterioration of local or regional insulation of the running rail, the coupling operation of multiple reflux paths is obvious. In general, the modelling and analysis of reflux safety parameters have mainly focused on the urban rail system itself. In order to study the influence of multiple reflux paths coupling on reflux safety parameters and surrounding key metal projects, this paper proposes a dynamic simulation model of DC traction power supply system under multiple reflux paths coupling.
Firstly, based on the structure of DC traction power supply system with multiple reflux paths coupling, the dynamic simulation model of DC traction power supply system with multiple reflux paths coupling is established. The model introduces coupling sections at both sides of poor reflux and adds multiple reflux paths between these coupling sections, described by means of the matrix of multiple reflux paths coupling. Then the dynamic distribution calculation method for multi-interval reflux safety parameters under multiple reflux paths coupling is established. Finally, the distribution of rail potential and stray current under different types of multiple reflux paths coupling is analyzed based on the actual line parameters.
Simulation results show that, when the running rail insulation deterioration coupling, the amplitude of the rail potential at the deteriorating position will decrease, stray current generates a sudden change, the whole line rail potential will be pulled down or raised, and the maximum value of whole line stray current increased to -800.1 A. When buried metallic pipe coupling, the maximum value of the total stray current leaking into the pipe is 32.6 A. When parallel cable in high resistance sections of running rail coupling, the maximum value of the rail potential is significantly reduced from 185.3 V to 156.8 V after the parallel cable treatment, and the peak-adjusted operating schedule does not have an impact on the effectiveness of the treatment. When the surrounding grounding grid coupling, the grounding current is negatively correlated with the rail potential at the coupling point, the maximum value of the grounding current is 14.9 A. When UCD is set up on the multiple reflux paths, the direction of the grounding current only exists in the positive direction, which effectively reduces the overall current flow on multiple reflux paths.
The following conclusions can be drawn from the simulation analysis: (1) The model comprehensively considers the coupling relationship between the DC traction power supply system of urban rail and the key metal engineering around it, and based on the multiple reflux paths coupling matrix, it can effectively describe the multiple reflux paths, and realize the unified modeling of multiple reflux paths and complex operating conditions. (2) In the case of multiple reflux paths coupling, the potential and current of the urban rail system and other surrounding metal structures change significantly, so the multiple reflux paths coupling should be considered comprehensively when analyzing the dynamic change of the safety parameters of urban rail system. (3) The model can be applied to the analysis of rail potential and stray current treatment effect. The effectiveness of treatment methods such as parallelling cable in high-resistance section of running rail and setting UCD on reflux path shave been verified.
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Received: 25 December 2023
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2024, Vol. 39 
