In order to study the regenerative energy use for metro trains and analyze optimized energy saving po-tential of given operation diagrams,operational constraints against a background of two trains under tracing op-eration were established on the basis of the equivalent regenerative circuit and traction calculation model,and with the obj ective 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 regenera-tive 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 j ust 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 efficien-cy provided by this algorithm is closely related to the spacing time.Adj ustment of train spacing and its speed profile and application of the new algorithm at the same time can achieve further energy saving effect.%为了研究地铁列车再生能量利用，分析给定运行图的节能潜力，以牵引变电所处总能耗最小为目标，依据再生制动等效电路和牵引计算模型，获得地铁列车两车追踪运行约束。在假设前行列车运行状态已知的条件下，采用二次规划算法，优化追踪列车操纵序列，提高再生制动能量的吸收利用，降低系统总能耗。仿真算例与仅考虑单车优化运行策略的方案对比结果表明：给出的算法能够在保证追踪列车正点、准确停站的前提下，节约3.8%的系统总能耗。通过该算法获得的节能效率与列车追踪间隔密切相关，同时调整追踪间隔和采用该优化算法可获得更好的节能效果。
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