基于两相式模块化多电平变流器的电气化铁路不断电过分相装置拓扑研究

发布时间：2018-02-01 08:22

  本文关键词： 不断电过分相 模块化多电平 两相式变流器 控制策略　出处：《电网技术》2015年10期 　论文类型：期刊论文

【摘要】：提出一种基于模块化多电平结构的电气化铁路不断电过分相装置拓扑,该拓扑无需变压器,可直接接入27.5 k V等级的牵引供电系统。拓扑采用两相式结构,两个交流输出端子分别接于中性段与一条牵引供电臂,直流支撑电容支路的中点接在钢轨上。建立了所提出拓扑的数学模型,并与应用于直流输电领域的三相式模块化多电平换流器(modular multilevel converter,MMC)拓扑进行了比较,两相式MMC拓扑的公共直流电容电压中不仅包含直流分量,还包含工频基波分量。基波分量的大小与两相输出电流之和成正比,与电容容值成反比。设计了装置级控制策略,提出对上下桥臂电流都采用直接电流反馈的闭环控制方式,保证装置交流输出电流具有较好的波形。利用PSCAD仿真和样机实验验证了所提拓扑及控制策略的正确性和有效性。
[Abstract]:In this paper, a new topology of uninterruptible phase crossing device for electrified railway based on modularized multilevel structure is proposed, which does not require transformer. Direct access to 27.5 kV grade traction power supply system. Topology adopts two-phase structure, two AC output terminals are connected to neutral section and a traction power supply arm respectively. The midpoint of the DC supporting capacitor branch is connected to the rail. The mathematical model of the proposed topology is established. It is compared with the three-phase modularized multilevel convertor MMC topology used in DC transmission field. The common DC capacitor voltage of two-phase MMC topology contains not only DC component, but also power frequency fundamental component. The magnitude of fundamental component is proportional to the sum of two-phase output current. The control strategy of device level is designed, and the closed-loop control method of direct current feedback is proposed for the upper and lower arm current. The PSCAD simulation and prototype experiments are used to verify the correctness and effectiveness of the proposed topology and control strategy.
【作者单位】： 电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);
【基金】：国家自然科学基金项目(51107065)~~
【分类号】：TM46
【正文快照】： 基波分量。基波分量的大小与两相输出电流之和成正比,与电容容值成反比。设计了装置级控制策略,提出对上下桥臂电流都采用直接电流反馈的闭环控制方式,保证装置交流输出电流具有较好的波形。利用PSCAD仿真和样机实验验证了所提拓扑及控制策略的正确性和有效性。0引言近年来,我，

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