Objective To reduce the traction energy consumption during the operation of suburban railway trains, it is necessary to change the existing fixed speed limit energy-saving operation strategy of the signal system, study a dynamic energy-saving optimization method based on real working conditions and actual operation curves.

Method The calculation theories of the fixed speed limit and the dynamic energy-saving operation optimization strategy are introduced. The drawbacks of the fixed speed limit energy-saving strategy in actual engineering applications are analyzed. Taking the Wenzhou Suburban Railway Line S2 project as an example, a numerical simulation is conducted on the train operation speed curves and traction/braking curves under both strategies. Multiple no-load dynamic train operation tests are carried out on the same train in sections of Line S2. The measured data and simulation data are compared and analyzed to verify the actual energy-saving effect of the simulation data.

Result & Conclusion  The proposed dynamic energy-saving operation optimization strategy has higher application value. Compared with the existing fixed speed limit energy-saving operation strategy, the former results in a smoother speed curve, with higher passenger comfort, lower traction energy consumption and shorter inter-station running time.