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Interharmonics Estimation Based on Interpolation FFT Algorithm

Qi Caijun Wang Xiaohai(Zhejiang University 310027 China)  
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.
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