电气化铁路多电平贯通式同相供电装置拓扑与控制

Topology and Control of Multi-level Trough-type Cophase Power Supply Device for Electrified Railway

我国电气化铁路采用单相工频牵引供电系统,负序和电分相是其存在的主要问题,而贯通式多电平同相供电装置通过三相-单相对称变换,可有效解决该问题。针对目前多电平同相供电技术的发展,本文分类归纳了适用于同相供电装置的多电平全电力电子变换拓扑,总结了同相供电装置的控制技术,分析比较了不同多电平同相供电装置的特点和适用场合,最后结合新能源高比例接入电网的背景,提出新能源混合多端同相供电系统构想,为同相供电装置的深入研究与牵引网架构的发展提供借鉴。

The electrified railways in China use single-phase power frequency traction power supply systems,in which negative-sequence and electrical phase separation are the main exsiting problems. A multi-level through-type cophase power supply device can effectively solve these problems through a three-phase-single-phase symmetrical transformation. In view of the development of multi-level cophase power supply technologies at present,the multi-level full power electronic conversion topologies suitable for cophase power supply devices are classified in this paper,the corresponding control technologies are summarized,and the characteristics and applicable scenarios of different multi-level cophase power supply devices are analyzed and compared. Finally,under the background of high proportion of new energy sources connected to power grid,a new energy hybrid multi-terminal cophase power supply system is proposed,which provides reference for the in-depth study of cophase power supply devices and the development of traction network architecture.