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《Journal of Data Acquisition and Processing》 2011-04
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Harmonic Analysis Based on Blackman-Harris Window and Phase Difference Correction

Liu Haisheng1,Fu Zhihong1,Zhang Huaiqing1,Li Shengfang2,Hou Xingzhe2(1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology,Chongqing University,Chongqing,400044,China;2.Electric Power Experimental Research Institute of Chongqing,Chongqing,401123,China)  
It is difficult to perform synchronized sampling and integral period truncation in the harmonic analysis of power system with the fast Fourier transform(FFT) technique.However,without the satisfaction of both these conditions,the acccracy can be influenced by the frequent leakage.Therefore,the BlackmanHarris window function is introduced to analyze the characteristics of time and frequency domains.Harmonic signals are weighteed by the Blackman-Harris window,and analyzed by combining the principles of phase difference correction.Then the calculation formulae of fundamental and harmonics of the signal frequency,amplitude and initial phase are deduced.Moreover,the spectrum of the conventional phase difference correction method is improved.Simulation results show that there is no obvious increase in the computing time comparing the Blackman-Harris window with other cosine window,while the accuracy of calculation is significantly improved by applying Blackman-Harris window.It can be concluded that the algorithm proposed in this paper is simple with high accuracy and versatility which can be applied to high-precision energy measurement and power quality analysis.
【Fund】: 国家重点实验室自主研究(2007DA10512709209)资助项目;; 重庆大学“211工程”三期创新人才培养计划(S-09111)建设项目
【CateGory Index】: TN911.6
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