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Algorithm of Sampling Frequency Plesiochronous in Harmonic Detection

SHI Cai-jun(Hebei University,Baoding 071002)  
A sampling frequency self-adaptive algorithm,and which can obtain the actual signal frequency fairly accurate,has been given.By adjusting sampling time interval the frequency calculation,the algorithm can achieve sampling frequency self-adaptive,reduce synchronous error and the influence of spectral leakage,thereby can improve the accuracy of spectral analysis and harmonic measurement for power system signal which frequency change is slow.This algorithm can be implemented easily,and has high precision.
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