用于电动汽车集群并网的直流变压器启动研究  

Research on Startup of DC Transformer for Electric Vehicle Cluster GridConnection

作　　者：贾俊[1] 范炜豪 吕志鹏 姚建光[1] 周珊 王健 张锦涛 JIA Jun;FAN Weihao;LÜZhipeng;YAO Jianguang;ZHOU Shan;WANG Jian;ZHANG Jintao(State Grid Taizhou Power Supply Company,Taizhou 225300,Jiangsu Province,China;State Grid Shanghai EnergyInterconnection Research Institute Co.,Ltd.,Pudong New Area,Shanghai 201213,China)

机构地区：[1]国网泰州供电公司,江苏省泰州市225300 [2]国网上海能源互联网研究院有限公司,上海市浦东新区201213

出　　处：《发电技术》2023年第6期875-882,共8页Power Generation Technology

基　　金：国网江苏省电力有限公司科技项目(J2021132)。

摘　　要：模块化多电平直流变压器(modular multilevel direct current transformer,MMDCT)为实现电动汽车充放电集群高效稳定并入城市直流配电网提供了一种可行的解决方案,但其启动过程中存在电容充电和变压器励磁涌流造成的冲击电流。为此,提出了一种基于复合频率控制的快速预充电策略,利用直流量和中频量分别独立MMDCT的原边和副边充电。原边充电采用双闭环控制,副边充电采用变步长移相的峰值电流控制,解决了充电速度和冲击电流之间的矛盾。进一步对多种预充电策略的冲击电流进行了量化对比分析。通过仿真验证了所提出预充电策略的有效性和可行性,结果表明,所提出的方法有效控制了冲击电流大小和充电时间。Modular multilevel direct current transformer(MMDCT)provides a feasible solution to realize the efficient and stable integration of electric vehicle charging and discharging cluster into urban DC distribution network.However,there are impulse currents caused by capacitor charging and transformer inrush current in its starting process.Therefore,a fast pre-charging strategy based on compound frequency control was proposed.The independent control of direct current component and intermediate frequency component was used to realize simultaneous charging of the primary and secondary sides.The double closed-loop control was adopted in the primary side,while the variable-step phase shift peak current control was adopted in the secondary side,which solved the contradiction between charging speed and inrush current.Furthermore,a quantitative comparative analysis of various pre-charging strategies was carried out.The effectiveness and feasibility of the proposed pre-charging strategy were verified through simulation.The results show that the magnitude of the inrush current and the charging time are effectively controlled by the proposed method.

关 键 词：电动汽车 直流变压器(DCT) 预充电 复合频率控制 

分 类 号：TK01[动力工程及工程热物理]