中文摘要：

在分析IEC闪变仪测量原理的基础上,提出一种基于频谱分析的电压闪变计算方法,先利用快速傅里叶变换（FFT）进行频谱分析,得到各频率分量的参数,然后利用这些参数计算电压闪变。新算法不仅能计算调制波和间谐波引起的总瞬时闪变视感度,还能计算出每个间谐波或间谐波对引起的瞬时闪变视感度占总瞬时闪变视感度的比例,即对闪变的贡献。它表明调制波是间谐波的特例,并且,当输入电压中含有间谐波对时,间谐波对引起的瞬时闪变视感度中的共同作用部分与基波和间谐波的初相角有关,而在以往的研究中一般未考虑相角的影响,或将相角默认为0°。仿真算例将频谱法和IEC算法进行了对比分析,验证了频谱法的有效性和准确性。

英文摘要：

According to the principle of IEC flicker meter, an algorithm for flicker calculation based on spectrum analysis is proposed. First, FFT is used to calculate the parameters of each frequency component. Then, voltage flicker is obtained by using these parameters. The algorithm can calculate not only the total instantaneous flicker sensation level caused by the modulated wave and interharmonics, but also the percentage of the instantaneous flicker sensation level due to each interharmonic or each pair of interharmonics, namely, the contribution of each interharmonic or each pair of interharmonics to the total instantaneous flicker sensation level. The algorithm demonstrates that the modulated wave is a special case of interharmonics. When the input voltage contains a pair of interharmonics, the instantaneous flicker sensation level due to the interaction of each pair of interharmonics is related to the initial phase angles of the fundamental wave and interbarmonics, which are not considered or considered as zero in previous study. A comparison of the result using the new algorithm with that of IEC algorithm demonstrates the effectiveness and accuracy of the former.