Recognition of Traveling Surges in HVDC with Wavelet Entropy

Luo, Guangzhao; Lin, Qizhi; Zhou, Lin; He, Jinghan

doi:10.3390/e19050184

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…According to wavelet transform, the entire frequency band is divided into m levels to obtain frequency bands of different levels. The wavelet coefficients in the ith (1 ≤ i ≤ m) frequency band form a set X i [39,40]. Taking the maximum and minimum values of X i as upper and lower limits, respectively, this range is equally divided into n intervals.…”

Section: Definition Of Wavelet Entropymentioning

confidence: 99%

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Protection Method Based on Wavelet Entropy for MMC-HVDC Overhead Transmission Lines

et al. 2021

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Recent technological developments in modular multilevel converter-based high-voltage direct current (MMC-HVDC) transmission systems have shown significant advantages over the traditional HVDC and two-level voltage source converter (VSC) transmission systems. However, there are a lack of studies on the protection methods for MMC-HVDC overhead lines where the protection method should be able to provide a fast and accurate response and be able to identify lightning strikes. In this paper, a wavelet entropy-based protection method is proposed. Due to the capability of revealing time–frequency distribution features, the proposed protection method combines wavelet and entropy to identify the time–frequency characteristics of different faults. Simulation results show that the proposed method can accurately and quickly determine the types of faults or disturbances with appropriate noise tolerance. In addition, the impact of the ground resistor and fault distance on the performance of the proposed method is studied.

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Section: Definition Of Wavelet Entropymentioning

confidence: 99%

“…The fourth Daubechies wavelet "db4" is used in the wavelet decomposition in this paper [41]. The number of wavelet decomposition levels should be less than nine levels [40]. Combined with the spectrum displayed in Figure 11, the number of decomposition levels is selected as eight.…”

Section: Wavelet Entropy Of Different Transientsmentioning

confidence: 99%

Protection Method Based on Wavelet Entropy for MMC-HVDC Overhead Transmission Lines

et al. 2021

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“…Entropy, a convenient tool for measuring the overall disorder of the system, has been effectively used in the field of signal processing [13,35]. If the frequency spectrum of any signal is considered as a system, its distribution can be characterized by entropy.…”

Section: Definantion Of Fsementioning

confidence: 99%

“…Compared with traditional magnitude-based feature extractions that will be affected by unequally distortions, the entropy can characterize the distribution of energy in a certain range. It is a powerful tool to extract transient signal characteristics and is immune to variations of magnitude attenuations and distortions [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Entropy SVM–Based Recognition of Transient Surges in HVDC Transmissions

Luo

Yao

Liu

et al. 2018

Entropy

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Protection based on transient information is the primary protection of high voltage direct current (HVDC) transmission systems. As a major part of protection function, accurate identification of transient surges is quite crucial to ensure the performance and accuracy of protection algorithms. Recognition of transient surges in an HVDC system faces two challenges: signal distortion and small number of samples. Entropy, which is stable in representing frequency distribution features, and support vector machine (SVM), which is good at dealing with samples with limited numbers, are adopted and combined in this paper to solve the transient recognition problems. Three commonly detected transient surges-single-pole-to-ground fault (GF), lightning fault (LF), and lightning disturbance (LD)-are simulated in various scenarios and recognized with the proposed method. The proposed method is proved to be effective in both feature extraction and type classification and shows great potential in protection applications.

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