LU Qing, QI Fang, WANG Zhe, et al. Dynamic analysis and improvement of grounding return performance of metro vehicles. [J]. Electric drive for locomotives (2):121-128(2022)
DOI:
LU Qing, QI Fang, WANG Zhe, et al. Dynamic analysis and improvement of grounding return performance of metro vehicles. [J]. Electric drive for locomotives (2):121-128(2022) DOI: 10.13890/j.issn.1000-128X.2022.02.017.
Dynamic analysis and improvement of grounding return performance of metro vehicles
The return performance of metro vehicles in the traction power supply system was analyzed
and an improved design for vehicle grounding was proposed. Since the metro vehicle operation process cannot be accurately and continuously performed by conventional time-domain simulations
a network-vehicle interaction dynamic simulation scheme was proposed for analyzing the grounding return performance of metro vehicles. Taking the two actual metro types
adopting resistor grounding and direct grounding respectively
as the objects of study
comprehensive models consisting of the vehicle body
grounding circuit
traction load
rail return circuit and power supply network were developed in the general simulation environment. Based on the key parameters of the metro line and vehicle
traction calculation results were acquired
and then were imported into the models
which achieved continuous update of the vehicle traction load and associated position
so as to simulate the grounding return distribution during the vehicle operation process. Simulation analysis verified that in the same line with the same traction strategy
the model grounded via protective resistor had less car body-rail return current and inter-car body current than the directly grounded model
but its car body potential was slightly raised. Further
two improved designs based on the resistor grounding scheme were proposed. Simulation results show that both the designs strike a balance between car body return current and potential suppression of a whole metro train. The proposed simulation method is useful for verifying the performance of metro vehicle grounding
and the simulation results can be as a reference for the grounding design.
关键词
地铁车辆接地回流牵引计算动态仿真
Keywords
metro vehiclegrounding returntraction calculationdynamic simulation
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