基于泰勒-傅里叶变换的电压闪变测量方法

Voltage Flicker Measurement Based on Taylor-Fourier Transform

该文提出一种基于泰勒-傅里叶滤波器(TFF)的动态电压闪变测量方法。首先使用TFF提取闪变信号包络,运用各阶泰勒系数表征包络参数,实现了调制深度和频率的快速估计以及包络突变时刻的检测;然后对所提取的包络进行二次TFF运算,估计闪变频率成分的时频信息;最后根据IEC相关标准,结合所估计的包络参数实现闪变值的准确测量。与基于能量算子的S变换方法相比,该文所提方法具有更高准确度和更小计算量,实现了闪变成分的时频特征提取。实测结果验证了该方法的准确性和有效性。

This paper proposes a method for dynamic voltage flicker measurement based on Taylor-Fourier filter(TFF).Firstly,the envelope of voltage flicker is extracted by TFF,and the envelope parameters can be expressed by the Taylor coefficients.The estimation of the modulation depth,modulation frequency and detection of the envelope transients can thus be achieved.Secondly,the TFF of the extracted envelop is performed to estimate the time and frequency domain information of each flicker component.Finally,based on the estimated envelope parameters,the flicker values are calculated according to the definitions of IEC(international electrotechnical commission).Compared with the S-transform method based on Teager energy operator,the proposed method has higher accuracy and smaller calculation amount.The proposed method can achieve the measurement of time-varying voltage flicker.The measured results verify the accuracy and usefulness of the proposed method.