摘要
电气化铁道牵引机车的单相非线性,导致供电系统含有大量负序、谐波及无功电流。基于有源滤波器补偿的电气化铁道牵引供电系统,关键是补偿电流的检测。检测方法影响补偿的内容及结果的精确性及实时性。根据瞬时无功功率理论,提出一种能综合补偿电气化铁道牵引供电系统负序、谐波和无功电流的检测方法。该方法通过无延时的两相虚拟,不存在相序延迟,能检测出系统中含有的谐波及无功电流,通过平衡变换原理,能检测出负序电流。同时该检测方法的应用不受平衡变压器限制。通过综合补偿理论分析和仿真结果证明,该检测方法具有实时性好、检测精度高的特点。
Single- phase and nonlinearity of traction locomotive in electrified railway result in big negative,harmonic,and reactive power currents in power supply system. The detection of compensating currents is the key of active power filter compensation for traction power supply system while the detection method has great influence on its precision and real-time performance. A detection method based on instantaneous reactive power theory is proposed,which comprehensively compensates the negative,harmonic and reactive power currents of electrified railway power supply system. It detects the harmonic and reactive power currents according to two virtual phases without any time delay, and then the negative current according to balanced commutation theory. Its application is not restricted to balanced transformer. Theory analysis and simulation prove its good real-time performance and high detecting precision.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第12期84-87,共4页
Electric Power Automation Equipment
关键词
牵引供电系统
有源滤波器
实时检测
补偿电流
负序
traction power supply system
active power filter
real- time detection
compensating current
negative
