基于三相-单相变换的新型同相供电系统方案  

A new cophase power supply system based on three-phase to single-phase converter

作　　者：漆炜之[1] 刘全景 谢永强[2] 李雪[2] 

机构地区：[1]江苏省电力公司淮安供电公司,江苏淮安223002 [2]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电力系统保护与控制》2017年第4期93-98,共6页Power System Protection and Control

摘　　要：针对当前电气化铁路供电系统中存在的负序、无功、谐波和电分相等问题,顺应铁路高速化、重载化的潮流,提出一种基于三相-单相变换的新型同相供电系统方案。该同相供电方式的整流侧采用不控整流电路,逆变侧采用H桥级联多电平单相SPWM变流器。由电压有效值和瞬时值双闭环控制,抑制不控整流电路的直流电压波动对逆变侧交流电压的不良影响,为机车负载提供稳定的电压支撑。分析了该新型同相供电系统的工作原理及其在不同工况下的供电性能,并在Matlab/Simulink平台上建立了系统模型。仿真结果验证了该方案的正确性与可行性。In order to solve the problems existed in the current electrified railway power supply system, such as negative sequence, reactive power, harmonics and split sections, and to conform to the trend of high speed and heave load, a new cophase power supply system based on three-phase to single-phase converter is proposed. The uncontrolled rectifier circuit is adopted in the rectifier side of the system, and the cascaded H-bridge multilevel single-phase SPWM converter is adopted in the inverter side. In order to suppress the negative effect of the DC voltage fluctuation on the AC voltage of the inverter side, and to provide stable voltage support for traction load, output voltage of the inverter side is controlled by voltage effective value and instantaneous value double closed-loop. Operating principle of the cophase power supply system and its power supply performance under different conditions are analyzed, and the system model is established on the Matlab/Simulink platform. Simulation results verify the correctness and feasibility of the proposed scheme.

关 键 词：电气化铁路 同相供电 三相-单相变换器 不控整流 多电平单相SPWM逆变器 

分 类 号：U223.6[交通运输工程—道路与铁道工程]