摘要
电力机车在通过电分相环节时的断电-复电操作会引起机车过电压和过电流问题,严重危及电气化铁路和旅客的安全。提出一种新型过分相方案,使机车无断电、满功率地通过电分相环节。该方案包含一个单相背靠背变流器,变流器的两交流侧分别接入中性段及一个牵引供电臂。当有机车通过电分相环节时,利用变频移相技术使中性段电压在两牵引供电臂电压之间实现柔性的切换,从而能够消除电分相环节的供电死区。介绍了该方案的系统构成及工作过程,给出了背靠背变流器系统级和装置级控制策略,最后通过仿真实例验证了提出的方案及控制策略的有效性。
Loss and recovery of power supply to electrified locomotives when passing neutral section will cause over voltage and over current in locomotives, which greatly threatens the safety of electrified railways and passengers. A novel uninterruptible flexible passing phase separation scheme is proposed, which comprises of a back-to-back converter and two transformers. The two AC sides of back-to-back converter are connected to one traction feeder and neutral section, respectively. When there is an electric locomotive passing phase-separation, voltage on neutral section can be gradually shifted between voltages of two traction feeders using phase shift technology at variable frequency in order to eliminate the power supply dead zone in neutral section and make locomotives run pass neutral section at rated power. System configuration is introduced firstly, then working principle and timing sequence are analyzed. System-level and device-level control strategies of back-to-back converter are given, and correctness and effectiveness are validated through simulation.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第21期14-18,共5页
Power System Protection and Control
基金
国家科技支撑项目(2009BAG12A09)
清华大学自主研究计划课题支持项目
关键词
电分相
不断电过分相方案
变频移相
背靠背变流器
双闭环控制
phase separation
uninterruptible phase-separation passing scheme
phase shift at variable frequency
back-to-back converter
double close loop control
