摘要
归一化的希尔伯特-黄变换是一种改进的希尔伯特-黄变换,NHHT可以更好地从非平稳非线性的故障电流信号中提取丰富的时频信息。建立了谐振接地系统单相接地故障暂态等值模型,从理论上分析了系统暂态接地电流特征,使用EMTP-ATP仿真谐振接地系统单相接地故障。NHHT分析结果表明,该仿真故障接地电流特征频带为200 Hz至400 Hz,且在250 Hz处到达最大值。联合时-频幅值谱显示了故障信号的时频信息,希尔伯特边际谱则动态地反应了故障信号的幅频特性。研究表明,不同故障初相角对故障接地电流有较大影响。
Normalized Hilbert Huang Transform（ NHHT） is an advanced Hilbert Huang Transform（ HHT）. NHHT can better extract rich time-frequency information from the non-stationary and nonlinear fault current signal. The characteristics of the equivalent model of the transient grounded current of a resonant grounded system are analyzed theoretically. The fault grounded current is simulated by EMTP-ATP. The result shows that the characteristic band of fault ground current is 200 Hz to 400 Hz,and the fault ground current reaches the maximum at 250 Hz. United time-frequency amplitude spectrum shows the time-frequency information of the fault signal while Hilbert marginal spectrum can better reflect the amplitude-frequency characteristics of the fault signal. Studies have shown that the different initial phase angle has great effects on fault ground current.
作者
刘宏超
武源明
何晓宇
刘景
张林
肖本贤
LIU Hong-chao1,WU Yuan-ming1,HE Xiao-yu1,LIU Jing1,ZHANG Lin2,XIAO Ben-xian2(1. State Grid Xianyang Xingping Power Company, Xianyang 713100, China; 2. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, Chin)
出处
《仪表技术》
2018年第5期1-5,14,共6页
Instrumentation Technology
基金
国家电网公司科技项目资助(SGSNXY00YJJS1700402)
