摘要
间谐波是频率介于两个谐波之间的信号。间谐波除具有一般谐波信号的特性外 ,还会严重影响现有谐波补偿装置 ,使谐波补偿失败 ,因此准确检测间谐波的参数具有十分重要的意义。讨论了间谐波的特点及检测方法 ,提出了基于加窗插值FFT算法的间谐波参数估计 ;讨论了窗函数的选择规则 ,推导了分析窗宽度的估计公式 ,以及基于Hanning窗的间谐波频率、幅值和相位的显式估计公式。仿真结果证明 ,该算法对电网间谐波和谐波的幅度、频率和相位的估计在一定条件下具有很高的精度。
Interharmonics are defined as the spectrum components that have frequencies between two harmonics.Comparing to harmonics,interharmonics have serious impacts on usual harmonics compensation devices.It is very important to measure interharmonics exactly.This paper discusses interharmonics' characteristics,measurement methods and proposes interharmonics estimation based on interpolation FFT algorithm.Some explicit estimation formula for the tapered window length and interharmonics'parameters are given.The simulating result shows that the estimation of the interharmonics',or harmonics',frequency,amplitude and phase reached a reasonable accuracy.
出处
《电工技术学报》
EI
CSCD
北大核心
2003年第1期92-95,共4页
Transactions of China Electrotechnical Society
