城轨交通混合型再生制动能量利用系统及其控制策略

Hybrid regenerative braking energy utilization system and its control strategy in urban rail transit

针对城轨交通再生制动能量利用问题,结合城轨交通供电系统负荷特性,提出一种含能馈系统与储能系统的混合型再生制动能量利用系统及其控制策略。结合城轨交通供电系统架构与负荷特性,提出混合型再生制动能量利用系统拓扑结构并分析其运行原理。以充分利用再生制动能量为目标制定系统能量管理策略,实现在多种运行模式和运行工况下的功率潮流管理。提出计及牵引网母线电压控制和系统动态功率分配的分层控制策略。通过仿真分析验证所提系统及其控制策略的正确性和有效性,并借助相关技术指标和经济性指标对不同再生制动能量利用方案进行对比。结果表明,所提分层控制策略能协调控制系统按需回馈、存储/释放再生制动能量,实现城轨交通再生制动能量高效利用,并有效抑制牵引网母线电压波动;同时,所提混合型再生制动能量利用方案能较好地兼顾技术效果和经济性,相比储能方案和能馈方案有一定优势,可作为城轨交通再生制动能量利用方案的选择之一。

Aiming at the utilization problem of regenerative braking energy(RBE)in urban rail transit,hybrid RBE utilization system(HRBEUS)combining energy feedback system and energy storage system and its control strategy are proposed considering load characteristics of power supply system in urban rail transit.The topology of HRBEUS is proposed considering the structure and load characteristics of power supply system of urban rail transit and the operating principle of HRBEUS is analyzed.Aiming at the full utilization of RBE,the energy management strategy of HRBEUS is formulated to realize the power flow management under various operating modes and conditions.Moreover,a hierarchical control strategy of HRBEUS combining the DC bus voltage control and the dynamic power allocation is proposed.The validity and feasibility of the above design are verified by simulation analysis,and the indexes of different RBE utilization schemes are compared.The results show that the proposed hierarchical control strategy can coordinate the control system to feedback,store and release RBE on demand,so as to realize the full utilization of RBE of urban rail transit,and restrain the DC bus voltage variation effectively.At the same time,the proposed HRBEUS can better take into account the technical effect and economy,and has certain advantages compared with energy storage scheme and energy feedback scheme,so it can be used as one of the choices of RBE utilization scheme in urban rail transit.