Metro Traction Power Supply System Regenerative Braking Energy Storage Control

In the subway system when a train runs to the brake operation, traction motor power, will produce regenerative braking energy back to the traction network, the network will lead to hypertension. To avoid this situation, the domestic underground resistance mainly absorb energy consumption, although the stable net pressure, but leading to the energy dissipation and temperature tunnel. Since the subway frequent start, brake, will produce a very impressive regenerative braking energy.Firstly, for the traction power supply analyze the system and modeling, to give traction network equivalent model. From the kinetic analysis and regenerative braking characteristic curves of two comparative studies, through simulation, during regenerative braking of train traction feedback to each physical parameter network.Secondly, super capacitor works, characteristics, equivalent model, simulation studies of charge and discharge characteristics. According to the need to store regenerative braking energy sized, Super-capacitor pack energy storage, to determine the series and parallel storage array according to the voltage, power constraints, and ultimately come to each parameter value equivalent model.Again, in order to complete the two-way flow between the network and the traction Super-capacitor energy group, with the half-bridge-type non-isolated BDC to connect the two portions, and added filter link construct the equivalent mathematical model. Traction voltage network selection outer ring, the inner ring of the inductor current double closed-loop control strategy. Use bode diagrams and step response analysis of the effects of the control and determine the best corrected link.Finally, the use of emulation software model, complete energy storage systems for the control strategy under different modes of simulation results verify the energy storage system of the present control process design and analysis accuracy.The energy storage device control strategy design, the improved algorithm can effectively suppress overshoot, fast, efficient and stable traction network voltage to achieve energy reuse.