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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。
The traditional flicker detection method is based on the premise of accurately extracting the envelope of the amplitude modulation wave. The process is complicated and the amount of calculation is large. Voltage flicker real-time detection of a new method, using recursive analysis method to calculate the frequency of carrier frequency signal; using the adjacent three-point sampling data, the frequency of the carrier frequency signal, the sampling frequency of the current voltage flicker waveform envelope size. The flicker signal contaminated by noise or inter-harmonics is not affected by low-pass filtering. The simulation results show that this method can directly detect the flicker signal, and has the advantages of simple process, small operation amount, strong real-time performance, good tracking performance, certain anti-noise and interference suppression interharmonics ability, and is suitable for real-time voltage flicker detection.