Energy saving control of metro train tracing operation

In order to study the regenerative energy use for metro trains and analyze optimized energy saving potential of given operation diagrams, operational constraints against a background of two trains under tracing operation were established on the basis of the equivalent regenerative circuit and traction calculation model, and with the objective of minimizing total energy consumption at the traction substation. Under the assumption that the operational status of the preceding train was already known, increased absorption and use of regenerative braking energy and minimum system energy consumption were achieved by optimizing the speed profile of the following train through quadratic programming. Comparing with the case of just considering single train speed optimization, the new algorithm can result in a 3.8% total energy saving for the following train, while ensuring its punctuality and accurate station stop positions. Simulation analysis shows that the energy efficiency provided by this algorithm is closely related to the spacing time. Adjustment of train spacing and its speed profile and application of the new algorithm at the same time can achieve further energy saving effect. ©, 2014, Science Press. All right reserved.