Abstract：The interharmonics which are closed to harmonics may bring on signal flicker. Based on the specified signal processing recommendations by IEC61000-4-7, this paper presents a new spectrum separation method for detecting harmonics and the main interharmonics in power system. Firstly, the spectral interference between harmonics and interharmonics under synchronized sampling is investigated. According to the characteristic of discrete spectral leakage, leakage values at harmonic frequencies caused by interharmonics can be estimated by using the spectral lines nearby and the technique called variable reorganization. Then the harmonic parameters can be corrected by subtracting leakage value from the original spectrum. Interharmonic signal in time-domain can be got by subtracting the resampled harmonic signal from the original sampled data, then zero-padding or CZT is use to detect the corresponding parameters. From the analysis of simulations and field test, the validity of the proposed method is proved; it can separate harmonics and interharmonics effectively, and strongly restrain the spectral interruption; extract interharmonic component even when the frequency difference between the harmonic and interharmonic is less than 5Hz.
惠锦, 杨洪耕. 基于间谐波泄漏估算的谐波间谐波分离检测法[J]. 电工技术学报, 2011, 26(1): 183-191.
Hui Jin, Yang Honggeng. Harmonics and Interharmonics Separate-Detection Method Based on Estimation of Leakage Values Caused by Interharmonics. Transactions of China Electrotechnical Society, 2011, 26(1): 183-191.
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2011, Vol. 26 
