提取电压闪变参数的一种新方法

基于低幅值单频或多频叠加调制的电压闪变信号经过分解后，在频域内总是在工频两侧呈对称分布的特点，并考虑到实际低幅调值制信号的频率范围，提出将电压闪变信号映射到频域内，实现电压闪变信号的调制，只保留对求取调制信号参数有用的低频部分———调制闪变信号，并运用Hilbert-Huang变换提取调制闪变信号瞬时参数。在此基础上再运用推导公式便能实现电压闪变信号中调制信号参数的有效提取。仿真和实例分析结果均表明了本方法的可行性、有效性，为电压闪变参数提取提供了一种新方案。

A Novel Method to Extract the Parameters of Voltage Flicker

After voltage flicker signal, which modulated by low-magnitude single frequency signal or multi-frequency complex signal, is decomposed, it is characterized by symmetrical distribution on both sides of the frequency in the frequency domain, taking the frequency-band of actual modulated signals into account, a novel method is developed to realize the purpose of modulating the voltage flicker signal in frequency domain and keep down the low-frequency parts, which named as modulated flicker signal, the parameters of low-magnitude modulated signal can be extracted by the formulas deduced after the parameters of modulated flicker signal extracted by the Hilbert-Huang Transform. The simulation and example indicate that the method can extract the parameters of low-magnitude modulated signal from voltage flicker signal easily and effectively, and it is a new way to extract the parameters of low-magnitude modulated signal.