摘要
传统闪变检测方法以准确提取调幅波包络线为前提,过程复杂,运算量大。电压闪变实时检测新方法,用递归分析方法计算工频载波信号频率;运用相邻三点采样数据、工频载波信号频率、采样频率求得当前电压闪变波形包络大小。对被噪声或间谐波污染的闪变信号,进行低通滤波后检测结果不受影响。仿真结果表明:该方法直接检测闪变信号,实现过程简单,运算量小,实时性强,跟踪性能好,具有一定抗噪与抑制间谐波干扰能力,适合电压闪变的实时检测。
Traditional voltage flicker detection method is based on the exact extraction of the envelope,so its process is complex and its computational burden is heavy.In this paper,a real-time detection method for voltage flicker is recommended.With this method,frequency of work-frequency carrier wave signal is calculated based on recursive analysis;the current size of envelops of voltage flicker wave shapes is worked out by the adjacent three sample data,signal frequency of work-frequency carrier,and sample frequency.As for the flicker signal that is polluted by noise or interharmonic wave,the testing is not affected after low-pass filtering.The simulation indicates that this method can detect flicker signal directly,the working process is simpler with less calculation amount;its real-time performance is strong and has a good tracking performance;it also can resist noise and restrain interharmonic wave.Therefore,it fits to do real-time detection of voltage flicker.
出处
《湖南涉外经济学院学报》
2011年第4期76-80,共5页
Journal of Hunan International Economics University
关键词
电压闪变
实时检测
递归分析
包络检测
低通滤波
voltage flicker
real-time detection
recursive analysis
envelope detection
low-pass filtering
