A Cooperative Charging Protocol for Onboard Supercapacitors of Catenary-Free Trams
A Cooperative Charging Protocol for Onboard Supercapacitors of Catenary-Free Trams
复制标题
无接触网有轨电车车载超级电容器协作充电协议
DOI：
10.1109/tcst.2017.2717382
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发表时间：
2018-07-01
影响因子：
4.8
通讯作者：
Pan, Jianping
中科院分区：
文献类型：
--
作者：
Li, Heng;Peng, Jun;Pan, Jianping
配备车载超级电容器的无接触网有轨电车已成为一种新兴的节能城市轨道交通方式。然而，无接触网有轨电车的大功率充电负载给充电系统的设计带来了新的挑战。传统的单模块充电系统通常会承受高功率和热压力，这降低了充电系统的可靠性。在本文中，我们提出了一种多模块充电系统，通过将功率压力分解到多个充电模块来提高系统可靠性。具体来说，提出了一种协作充电协议，通过抑制电流不平衡并避免启动过程中的电流过冲来提高充电系统的动态性能。首先，我们使用状态空间平均方法和图论对多模块充电系统进行数学建模。其次，协作充电协议是使用领导者-跟随者共识算法设计的，其中虚拟领导者代表具有热启动机制的每个模块所需的充电电流。第三，利用多输入多输出根轨迹技术来表征充电系统的动态性能。仿真和实验结果表明，该协议有效抑制了充电系统启动过程中的不平衡现象，避免了过冲。
Catenary-free trams with an onboard supercapacitor have been an emerging and energy-efficient way for urban rail transportation. However, the high-power charging load from catenary-free trams brings a new challenge to the design of charging systems. The traditional single-module charging system typically suffers from a high power and thermal pressure, which reduces the reliability of the charging system. In this paper, we propose a multimodule charging system to improve the system reliability by decomposing power pressure to multiple charging modules. Specifically, a cooperative charging protocol is proposed to improve the dynamic performance of the charging system by suppressing the current imbalance and avoiding the current overshoot during the startup process. First, we mathematically model the multimodule charging system using the state-space averaging method and graph theory. Second, the cooperative charging protocol is designed using the leader–follower consensus algorithm, where the virtual leader represents the desired charging current for each module with a warm-start mechanism. Third, multiple-input multiple-output root locus technique is exploited to characterize the dynamic performance of the charging system. Both simulation and experiment results show that the proposed protocol effectively suppresses the imbalance and avoids the overshoot during the startup of the charging system.