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Performance degradation caused by coefficient approximation in Sliding-DFT based phasor measurement  

Kim, Chong-Yun (School of Electrical Engineering, Chung-Ang University/NPTC)
Chang, Tae-Gyu (School of Electrical Engineering, Chung-Ang University/NPTC)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.4, 2002 , pp. 470-476 More about this Journal
Abstract
This paper presents an analysis of the performance degradation of coefficient approximation and frequency deviation in phase measurement algorithm based on Sliding-DFT. The analytic derivation is based on the statistics of the error dynamic equation that describes the error propagation of the recursion. The analysis result is intended to obtain a closed-form equation of error variance in terms of the number of bits used in coefficient approximation, the length of the DFT data block, and noise. It is verified with data obtained from the computer simulations.
Keywords
Sliding-DFT; phasor; frequency deviation; coefficient approximation;
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