i0d - urd PI + i rd - Gvd Gvq urq - + irq PI - PI Gid u1d + - Giq PI + + u1q - 1/Ls - - i1d + r wL wC wL wC r - 1/Ls - 1/Cs - i1q u0d u0q 1/Cs - i0q Inverter-Model Figure 12. A block diagram of the dual closed-loop control system of the inverter in the dq coordinators. figure is 7.11 # 104 kWh. Figure 13 shows the electric energy consumption and regenerative energy production per month. Here, the regenerative braking energy could supply the station ventilation and lighting. for the high-speed train CRH3 between Beijing and Tianjin stations with a travel time of 30 min. The aerial view of the Beijing South train station is depicted in Figure 15. The peak speed of the train is 350 kW/h with an energy consumption of 2,897 kWh and the regenerative energy of regenerative energy for supplying the battery storage on High-speed trains The high-speed trains in China use the ac-dc-ac conversion for traction. Trains get the single-phase 25-kV/50-Hz electric power from overhead wires through pantographs. The power flows through traction transformers, traction converters, and traction motors to drive the train. When regenerative braking occurs, traction motors run as generators, and electric power is fed back to overhead wires through traction converters and traction transformers. If the voltage of the overhead wire is higher than its upper limit, the regenerative energy is consumed by braking resistors as loss. Figure 14 shows the energy consumption 20 18 Electric Energy (kWh) 16 14 12 ×104 Electric Energy Consumption in Non-Air Conditioning Month Electric Energy Consumption in Air Conditioning Month Regenerative Energy 10 8 6 4 2 0 Figure 13. The electric energy consumption and regenerative energy production per month. tAbLe 1. the train Interval time for metro Line 13 at Wudaokou station. Weekdays (Monday-Friday) Blocks of train arrival times to the train station Interval time between train arrivals to the station (min) 5:19-6:20 6-7 6:20-7:20 4-5 7:20-9:00 3 9:00-11:50 4-6 11:50-15:30 7-8 15:30-16:50 4-6 16:50-19:30 3.5 19:30-20:40 5-7 20:40-23:26 8-10 Weekends (Saturday-Sunday) 5:19-6:20 10 6:20-7:20 7-9 7:20-9:00 5.5 9:00-11:50 7-9 11:50-15:30 10-11.5 15:30-16:50 7-9 16:50-19:30 6.5 19:30-20:40 7-9 20:40-23:26 10-13 IEEE Elec trific ation Magazine / s ep t em be r 2 0 1 4 45