城市轨道交通多端口双向能源路由器及其关键技术

Multi-port Bidirectional Energy Router for Urban Rail Transit and Its Key Technologies

目前,城市轨道交通(简称“城轨”)供电系统只能实现单向供电,无法适应绿色化、智能化、互联互通的能源互联网发展需求。对此,文章提出了一种交直流多端口双向能源路由器解决方案,其采用高频电力电子变换技术,将传统能量回馈系统中“工频隔离变压器+能馈变流器”结构替换为能源路由器,并将AC1180V端口并联在整流变压器二次侧绕组,实现与既有城轨单向供电系统的完美融合,达到整体系统的减重、减体积及供电-能馈系统结构优化的目的;通过能量管理系统调度及双向隔离型DC-DC变换器的平滑切换,实现列车牵引/制动时多电源端口(AC400V/AC1180V/DC1800V/DC900V)的能量灵活分配调度;通过对AC400V及AC1180V支路采用高频化拓扑参数优化设计及高频变压器磁饱和抑制等关键技术,实现全工况下软开关功能。实验结果表明,采用该解决方案,可实现供电系统无静态空载损耗及各种工况间的柔性平滑切换;各部件温升平稳且系统正常稳定运行,整机效率大于96%。

At present, urban rail transit power supply system can only realize unidirectional power supply, which cannot meet the development needs of green, intelligent and interconnected energy internet. A solution of AC/DC multi-port bidirectional energy router is proposed. It adopts high-frequency power electronic conversion technology, replaces the " isolation transformer +regenerative braking energy utilization equipment" structure in the traditional energy feedback system with an energy router, and connects the AC1180V port in parallel with the secondary side winding of the rectifier transformer, so as to realize the perfect integration with the existing urban rail unidirectional power supply system, and achieve the purpose of reducing weight and volume of the overall system and optimizing the structure of the power supply-energy feedback system. Through energy management system scheduling and two-direction smooth switching of the isolated DC-DC converter, flexible energy allocation among multiple power ports(AC400V/AC1180V/DC1800V/DC900V)is realized during train traction or braking. Key technologies such as high frequency topology parameter optimal design and magnetic saturation suppression of high-frequency transformer are adopted to realize soft switching of AC400V and AC1180V branches under all working conditions. Experimental results show that the solution can realize no static no-load loss, flexible and smooth switching between various working conditions;the temperature rise of each component is stable, the system can operate normally and stably, and its overall efficiency is more than 96%.