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《Power System Technology》 2007-07
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An Zero-Crossing Frequency Measuring Method Using Time-Domain Continuous Finite Impulse Response Filter

WU Chong-hao1,LU Yu-ping1,RAO Dan2 (1.School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China; 2.NARI Technology Development Limited Company,Nanjing 210061,Jiangsu Province,China)  
Based on the principle of time-domain continuous finite impulse response (TCFIR) filter, a short window narrow band pass continuous filter is designed. The filter processes input discrete sampling signal to recover continuous signal and suppress harmonic noise, and the zero-crossing frequency measuring method is improved. By detecting the zero-crossing points of the continuous signal, the frequency of input signal can be calculated. The fault voltage with 40% low frequency harmonics and high frequency harmonics in 500 kV transmission line is simulated, test results show that under the data window of four power frequency periods the frequency measurement error of the proposed method is less than 0.05Hz and the time delay is only two power frequency periods, its anti-harmonic and noise-proof performance and dynamic response characteristic is superior to Fourier frequency measurement method, so the proposed method can meet the requirement of real-time frequency measurement under application environment of electronic instrument transducers.
【Fund】: 国家自然科学基金项目(50577006)~~
【CateGory Index】: TN713;TM935.1
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