摘要
利用故障信号能量变化率量化换流器各类故障的电气特征,表征换流器故障信号相对于正常状态的变化情况。根据各电气量变化情况的不同,选择出能有效定位和诊断换流器各类故障的在线监测电气量。将各在线监测电气量的能量变化率与零进行比较,得到换流器不同故障情况下,各在线监测电气量逻辑编码值。利用编码值的不同,再结合统计学知识,提出换流器故障在线监测诊断系统。仿真结果表明,该系统能准确有效地定位和诊断出换流器各类故障,且不受系统运行方式和故障过渡电阻的影响。
The electrical characteristics of converter faults are quantified according to energy changing rate of fault sig- nals, which characterize the variation of converter fault sig- nal relative to that of normal state. According to the differ- ent variation of each electric quantity, the online monitoring electrical quantities that can localize and diagnose all kinds of converter faults effectively are determined. By comparing the energy changing rate of online monitoring electric quan- tities with zero, the logic code value of each online monito- ring electric quantity is obtained in different converter faults. According to the different logic code values, online monitoring and diagnosis system of converter fault is presen- ted by combing statistic knowledge. The simulation results show that the system can accurately localize and diagnose all kinds of converter faults, which are not influenced by sys- tem operation mode and transient resistance.
出处
《现代电力》
北大核心
2014年第6期53-58,共6页
Modern Electric Power
基金
国家自然科学基金重点项目(51037003)
国网四川省电力公司检修公司科技项目(SGSCJXOOYJKJ1301058)
关键词
换流器故障
能量变化率
在线监测电气量
逻辑编码
监测系统
converter fault
energy changing rate
online e-lectrical quantities
logic code value
monitoring system
