有轨电车车载混合储能系统效率优化控制

轨道交通迅猛发展对电力能源的需求越来越大。为减少能耗、降低运营成本,储能技术在轨道交通领域的应用成为近年来研究的热点。从提高车载储能系统效率的角度建立了混合储能系统的损耗模型,包括锂离子电池损耗、超级电容损耗、双向DC/DC变换器损耗。基于混合储能系统损耗模型,推导了损耗最小和储能元件安全工作区间的优化方程,提出了一种效率优化控制方法。最后,Matlab仿真结果表明,所提方法与阈值法相比,经过优化控制后混合储能系统全程总损耗明显减小,车辆单程运行能量效率明显提高。

Optimization control for the efficiency of an on-board hybrid energy storage system in tramway

The rapid development of rail transit energy demand for electricity is growing, in order to reduce the energy consumption and the operating costs, energy storage technology has become a hot focus in the field of rail transit. In this paper, the power loss model of hybrid energy storage system is established from the point of improving the efficiency, which includes the loss of the lithium-ion battery, the ultracapacitor and the bidirectional DC/DC converter. Based on the power loss model, an optimal equation is derived to minimize the power loss of the hybrid energy storage system and ensure the operation range of the energy storage element. Simulation results carried out on Matlab show that compared with the rule-based power management strategy, the total power loss of the hybrid energy storage system can be effectively reduced and the energy efficiency in a single scale tramway can be significantly increased by the proposed control strategy.