摘要
针对斯科特牵引变压器供电方式下,传统电流检测方法无法检测出基波正、负序电流,电流指令延时较长的问题,提出了一种无锁相环的FBD基波正、负序电流检测方法。该方法通过简单的数乘运算求出基波电压,并由此产生两相基波正序和负序基准电压,再通过基准电压和电流求出相应的等效电导,最终通过等效电导与基准电压求出基波正、负序电流分量。仿真结果表明,该方法不受电网畸变的影响,实时性和动态性能好,能有效检测出电气化铁路中基波正、负序电流。
Faced with the problem that the traditional current detection method has inability to detect fundamental positive and negative sequence currents and longer delay of command current detection process under the Scott transformer power supply,a fundamental positive sequence and negative sequence currents detection method was proposed based on FBD without PLL. Only with simple multiplication,it could obtain the fundamental voltage,and thus generate fundamental positive sequence and negative sequence reference voltages. With the reference voltages and currents,the equivalent conductance could be acquired,and then the conductance and reference voltage were used to calculate the fundamental positive sequence and negative sequence currents. The simulation results show that this method is more real-time and dynamic,and can effectively detect the positive sequence and negative sequence currents in electrified railway systems,which is not affected by grid distortion.
作者
张丰鸣
陈众
彭超敏
余思维
罗通
ZHANG Fengming;CHEN Zhong;PENG Chaomin;YU Siwei;LUO Tong(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410004,Hunan,China)
出处
《电气传动》
北大核心
2019年第1期72-77,96,共7页
Electric Drive
关键词
锁相环
FBD法
电气化铁路
正、负序电流
电流检测
phase-locked loop
FBD method
electrified railway
positive and negative sequence current
current detection
