A New DFT-Based Phasor Estimation Algorithm Using High-Frequency Modulation

被引:46
作者
Jafarpisheh, Babak [1 ]
Madani, Seyed M. [1 ]
Shahrtash, S. Mohammad [2 ]
机构
[1] Univ Isfahan, Dept Elect Engn, Fac Engn, Esfahan 8174673441, Iran
[2] Iran Univ Sci & Technol, Dept Elect Engn, Ctr Excellence Power Syst Automat & Operat, Tehran 16844, Iran
关键词
Damping factor; decaying dc component; discrete Fourier transform; high-frequency modulation; numerical relays; phasor estimation; DECAYING DC COMPONENT; FAULT LOCATION; REMOVAL; OFFSET; FILTER;
D O I
10.1109/TPWRD.2016.2629762
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper proposes a new fast algorithm to estimate the fundamental phasor of fault current signals, based on discrete Fourier transform (DFT). Since fault currents include decaying dc component (ddc), DFT-based algorithms have inaccuracy in phasor estimation. The proposed algorithm consists of four steps. First, a new auxiliary signal is introduced based on a simple high-frequency modulation of the fault current. Then, DFT of the fault current and sample-summation of both fault current and auxiliary signal are calculated, for each one-cycle-length data stream. Next, DFT estimation error due to the ddc is calculated. Finally, by removing this error, accurate fundamental phasor is obtained. This paper uses an innovative and accurate formulation based on notations of signal processing literature. To validate the proposed algorithm, several computer-simulated signals and an electromagnetic transient program-generated signal are employed. The proposed algorithm is compared with recent phasor estimation methods, using wide variety of test signals. Standard indices of rise time, settling time, and percentage overshoot are used for comparison. These comparisons show that the proposed algorithm has robust performance in off-nominal frequency condition, and presence of harmonics, noise and multiple ddc components. Moreover, it provides faster convergence speed and lower computation burden.
引用
收藏
页码:2416 / 2423
页数:8
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