Analysis and Research on Electromagnetic Compatibility of High Speed Railway Traction Current Harmonics to Track Circuit

The harmonic interference during the operation of rolling stock or EMU is an important interference source of signal system, especially the running track circuit. The harmonic currents in the signal band exceed the limit, which will affect the reliable operation of the track circuit. Analysis of harmonic characteristics based on traction current and the principle of harmonic suppression, a method of harmonic suppression using multiple control strategies is proposed according to the harmonic distribution characteristics of track circuit. Effectiveness of multiple control strategy for harmonic suppression of traction current is verified by simulation analysis and line operation test. The RMS of traction harmonic current can be controlled in the range of 0.3A. The overall performance of the vehicle is optimized and the electromagnetic interference of the track circuit is effectively suppressed.