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《Advanced Technology of Electrical Engineering and Energy》 2006-02
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A precise algorithm for frequency measurement of power system

ZHANG Yan-xia,WANG Liang,LIU Cui-yan(School of Electrical Engineering and Automation,Tianjin University,Tianjin 300072,China)  
The frequency is one of the most important characters of power system. It reflects the basic state of active power requirement and supply in power system.Based on theoretical analysis and simulations,this article makes some progress to the smart discrete Fourier transform algorithm(SDFT): amending the calculate formula,smoothing the data,and setting a threshold.The results of the simulations show that the improved SDFT algorithm can track the frequency automaticly to obtain its exact value when the frequency of power system deviates from the rating value.The improved SDFT algorithm has a shorter window length,and it is also easier to implement on the digital signal processor.The improved SDFT algorithm can satisfy the demand of real-time measurement and has a bright future in engineering apply.
【CateGory Index】: TM935.1
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