Harmonic resonance assessment of traction system with moving load based on modal analysis

In order to prevent the over-voltage brought by harmonic resonance of traction system, it is necessary to get the exact frequency and the position of locomotive which can eliminate the effects of moving load harmonic resonance on the traction system.Modal analysis is used to study the eigenvalues of the network admittance matrix. Using this method, the relationship between harmonic resonance of traction system and frequency and locomotive position can be obtained. C ompared with the result of frequency scan analysis,it demonstrates that the method used in this paper for simulation is correct. T heoretical analysis and case study have confirmed that the used method is a valuable tool of harmonic analysis for traction power system with moving load.