A Novel Power Swing Blocking Scheme Using Orthonormal Wavelet Analysis

Abstract:

A new scheme for fault identification during power swings is proposed in this paper. The new scheme is based on the orthonormal wavelet transform algorithm. The main advantage of the proposed scheme is that different types kinds of fault of the transmission line can be correctly identified from different types of the fast power swings. Also, the faults during power swings can be identified from the power swings with the proposed scheme without any time delay. Furthermore, the problem whether the protection should trip or not immediately for the distance protection is discussed in the paper. Test results with the data sampled from EMTP verify the effectiveness of the proposed scheme. Furthermore, another advantage of this algorithm is that it can be realized for the real-time applications with finite real calculation.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 6935-6942
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.6935
• Online since: January 2012
• Authors: Yi Hui Zhang, Hai Yan Zhang, Wei Li Xu
• Keywords: Distance Protection, Fault Identification, Orthonormal Wavelet Transform, Power Swing, Power System

References

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[4] I Daubechies, Orthonormal bases of compactly supported Wavelets, Communications in Pure Applied math, vol. 41, no. 7, pp.909-996, 1988 i(t)(A).

DOI: 10.1002/cpa.3160410705

0. 36 0. 72 1. 08 1. 44.

500 1000 1500 2000 -500 -1000 -1500 -2000 (tmax=1. 5s, � 180t =0. 5s, Hzf 10=∆ max ) Figure 2. Waveform of pure swing i(t)(A).

0. 01 0. 02 0. 03 0. 04 0. 05.

[1] [2] -1 -2 -3 Thousands Time(s) (a) Sampled waveforms.

0. 01 0. 02 0. 03 0. 04 0. 05.

[20] [40] [60] -20 -40 -60 Time(s) (b) WT results Figure 3. Waveforms of a single-phase to ground fault and a pure swing.

0. 01 0. 02 0. 03 0. 04 0. 05.

500 1000 1500 2000 -500 -1000 -1500 -2000 Time(s) (a) Sampled waveforms.

[12] ( )W i t.

0. 01 0. 02 0. 03 0. 04 0. 05.

[5] [10] [15] [20] -5 -10 -15 (b) WT results Figure 4. Waveforms of a single-phase to ground fault during a power swing and a pure swing i(t)(A) )(1.

[2] tiW i(t)(A).

0. 01 0. 02 0. 03 0. 04 0. 05.

500 1000 1500 2000 -500 -1000 -1500 -2000 Time(s) (a) Sampled waveforms )t(iW 1.

[2] [0] 0. 01 0. 02 0. 03 0. 04 0. 05.

[5] [10] [15] -5 -10 -15 Time(s) (b)WT results Figure 5. Waveforms of Double Phase-to-ground Fault(A-B)during a power swing i(t)(A).

0. 01 0. 02 0. 03 0. 04 0. 05.

500 1000 1500 2000 -500 -1000 -1500 -2000 Time(s) (a) Sampled waveforms )t(iW 1.

[2] [0] 0. 01 0. 02 0. 03 0. 04 0. 05.

[5] [10] [15] -5 -10 -15 Time(s) (b) WT results Figure 6. Waveforms of Phase-to-Phase Fault. (A-B)during a power swing i(t)(A).

0. 01 0. 02 0. 03 0. 04 0. 05.

500 1000 1500 2000 -500 -1000 -1500 -2000 Time(s) (a) Sampled waveforms.

[12] ( )W i t.

0. 01 0. 02 0. 03 0. 04 0. 05.

[2] [4] [6] [8] -2 -4 -6 Time(s) (b) WT results Figure 7. Waveforms of Single Phase-to-ground Fault(Phase B)with fault resistance(R=300 Ω)during a power swing.