Traction Energy Consumption Measuring Methods Study And Quantification Analysis On Engery Impact Factors Of High-speed Train

With the global resources shortage and serious environmental pollution, the energy issues more and more attention. Recent years, the development of high-speed railway in China attracted the attention of the world. Good environmental performance can ensure the sustainable development of the railway transport system and achieving better social and economic benefits. Although the railway has advantages of low energy consumption and large volume, but with the increase of speed, traffic and running distance, some new challenges are put forward.High-speed railway system is a large and complex systems engineering. Many impact factors of train operation process makes train traction calculation and energy-saving optimization complicated. Based on the well known rearch achievements, this paper relies on projects of "different modes of transportation energy consumption and emission factors of comparable research" and "technical regulations of rail transport modes and appraisal of their development planning". The research on energy consumption measuring method and quantification analysis on the engery factors of high-speed railway system were done. The main contents and results are as following:(1) A systematic analysis of the composition of the railway and energy consumption of the factors that affect the railway was done. Train energy consumption includes two parts:train operation energy consumption and auxiliary energy consumption. Traction energy consumption is a major component of the railway energy consumption, accounts for about 80% of the total energy consumption of railway. The main impact factors of train traction energy consumption include locomotive tractive characteristics, rolling stock characteristics, line characteristics, speed characteristics, marshalling characteristics, stop scheme, load factor, handling characteristics and other factors.(2) The research on calculation methods of high-speed train energy consumption was done. There are 3 kinds of methods:energy curve method, traction power consumption method and experience formula method. By using energy curve method, the energy consumption level of high-speed railway of some typical lines was calculated, and the results show that:In the current timetable, the Beijing-Tianjin inter-city railway, which using CRH3 type EMU, average energy consumption is 1059.64kWh/mpkm, the Wuhan-Guangzhou high-speed railway, which using CRH3 type EMU, average energy consumption is 1002.73kWh/mpkm, the Shijiazhuang-Taiyuan PDL,which using CRH5 type EMU, average energy consumption is 518.86kWh/mpkm. Meanwhile, on the basis research from abroad, the empirical formula was improved and calibrated. Energy consumption between High-speed railways and other modes of transportation were done, and the results show that High-speed railways cost more energy than railway and water transport but less than the commercial road and air. Suppose the railway energy consumption of level 1, so water for 1.57, and commercial road for 13.24, aviation for 97.78, high-speed railway for 5.79 (Vmax=350km/h) and 2.91 (Vmax=250km/h).(3) Quantification analysis on the engery factors of high-speed railway system was done by using "high-speed railway train running computing systems". Simulation case indicates that:CRH3 type EMU cost more energy than CRH5 type EMU under the same condition; the traction consumption increases linearly with the slope and increases as the curve radius is reduced, but the effect is not obvious, especially, when the curve radius is greater than 5000m; when the train technologies speed improve 10km/h, energy consumption will increase about 5% to 9% on average; stop scheme affect train operation energy consumption, high-speed train can reduce energy consumption by 3.2% to 7.72% under different stop schemes; when the load factor increased by 10%, energy consumption will decrease 16% to 19% on average.(4) The energy-saving method of high-speed railway was studied from the perspective of operation organization. A selection method of target speed value was put forward. This method sets the running time saving and the energy consumption increasement as a target, and the appropriate weight coefficients were selected to sole the model. The simulation results show that target speed changes with different combinations of weight coefficients.300km/h is more reasonable as the target speed value when running time is more important,250km/h is more reasonable as the target speed value when running time is as important as energy consumption,225km/h is more reasonable as the target speed value when energy consumption is more important.An optimization model of high-speed railway interval running time was established, which will reduce energy consumption of train operation by adjusting the interval between each train station recovery time. Examples show that the train operation energy consumption decreas 1.7% after optimization.