Study on the adaptability of traction power supply system under the operation of high density heavy haul train

While the operation of high-density heavy-load trains brings greater economic benefits, the increase in the number of trains running in the same power supply arm will lead to an increase in the burden and stability of the traction power supply system. Therefore, it is necessary to build a simulation model of the fully parallel AT traction power supply system and study the impact of high-density heavy haul train operation on the traction power supply system. Based on the PSCAD electromagnetic transient simulation software, this paper establishes the simulation model of traction power supply system, calculates the equivalent impedance model of heavy-load train through the relevant theory of electromagnetic field and the chain network model, and quantitatively analyzes the characteristics of the impact of heavy-load train on the traction network and traction substation under different operating conditions. The research shows that the simulation model of traction power supply system built in this paper is reasonable and correct. Based on the idea of chain network model, the equivalent impedance of trains at different positions can be obtained iteratively by updating the system node admittance matrix, and the iterative algorithm has fast convergence speed. When three heavy-load trains in the power supply section are running at the same time, the minimum voltage of the traction network can drop to 26.04kV, and the maximum current of the T contact line of the outgoing line of the traction substation can reach 764.5A. The research results of this paper can provide reference for exploring the feasibility of high-density heavy-load train operation and the adaptability of traction power supply system.