Probability Analysis of Negative Phase-Sequence Current for High-Speed Railway Traction Substation Based on Measured Data

In order to study the problem of current unbalance in the traction power supply system of high-speed railway, the stochastic process of loads in traction substations and the negative-phase sequence current feature of V/v connection transformers are analyzed, and a negative phase-sequence current probability model was proposed by probability theory. Using this model, the negative-sequence current of a traction substation on the Beijing-Shanghai high-speed railway was simulated and verified with the measured data. The results show that the probability distribution of the negative-sequence current obtained using the design parameters of the traction substation is consistent with the analysis results from the actual data. This proves that the proposed model can reflect accurately the negative sequence current distribution of high speed railway.