Directional Traveling-Wave Protection Based on Slope Change Analysis

Aguilera, C.; Orduña, Eduardo; Rattá, G.

doi:10.1109/tpwrd.2007.899519

Cited by 42 publications

(14 citation statements)

References 5 publications

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“…For the fault transients producing non-stationary signals with large frequency spectrum, this technique is unsatisfactory [18]. By contrast, with a suitable mother wavelet, DWT can be applied as a flexible and effective bandpass filter [19][20], which uses short windows at high frequencies and long windows at low frequencies. Protection based on DWT analysis has drawn a lot of attention among researchers [21][22][23][24].…”

Section: A Algorithm For Signal Analysis and Modified Mmfmentioning

confidence: 99%

Traveling Wave-Based Protection Scheme for Inverter-Dominated Microgrid Using Mathematical Morphology

Dyśko²,

Burt³

2014

IEEE Trans. Smart Grid

168

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Inverter dominated microgrids impose significant challenges on the distribution network, as inverters are well known for their limited contribution to fault current, undermining the performance of traditional overcurrent protection schemes. This paper introduces a new protection scheme based on the initial current traveling wave utilizing an improved mathematical morphology (MM) technology, with simplified polarity detection and new logics introduced for meshed networks and feeders with single-end measurement. The proposed protection scheme provides ultra-fast response and can be adapted to varied system operational modes, topologies, fault conditions and load conditions. Only low bandwidth communication is required to achieve high speed operation and adequate discrimination level in meshed networks. Simulation in PSCAD/EMTDC verifies both the sensitivity and stability of the proposed protection scheme under different microgrid operational scenarios. Index Terms-Microgrid protection, initial current traveling wave, inverter dominated microgrid, mathematical morphology.

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Section: A Algorithm For Signal Analysis and Modified Mmfmentioning

confidence: 99%

Traveling Wave-Based Protection Scheme for Inverter-Dominated Microgrid Using Mathematical Morphology

Dyśko²,

Burt³

2014

IEEE Trans. Smart Grid

168

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“…Using Equations (1) and (2) to express the measured impedance and returning the imaginary part, we have…”

Section: Protection Principlementioning

confidence: 99%

A novel negative sequence reactance based high speed directional relay algorithm

Zhang

Jian-cheng

2014

Int. Trans. Electr. Energ. Syst.

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SUMMARYNegative sequence (NS) directional protection may not provide desirable results when the fault component magnitude is quite small as a result of the existence of high resistance faults or remote forward faults with a strong source. Full cycle (FC) Fourier-based algorithms are widely used in digital relaying devices in order to estimate phasors. The common required time for fault detection in these relays is approximately one power frequency cycle. This paper presents a novel NS reactance-based high speed directional relay algorithm. General park transformation (GPT) is applied to calculate NS components within two to three sample intervals, which greatly increases the protection's operation speed. The fast response is comparable to transient component-based protection but with improved reliability. The NS reactance-based directional elements provide high sensitivity with no need to set the voltage or current threshold. The principle can correctly detect the fault direction even in the presence of low voltage and current. Extensive simulation results verified the effectiveness of the proposed algorithm and show that it has adequate selectivity, sensitivity and reliability, a fast operating response and immunity to fault resistance under a variety of system and unbalanced fault conditions. These excellent properties make it a good prospect for engineering applications.

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“…However, for the recognition of internal faults, the major interference is a lightning surge. As the traveling surges caused by lightning strikes change quite similarly with those produced by short faults, these rules cannot distinguish faults from lightning interference effectively [8][9][10][11][12]. Therefore, an additional function, or fault recognition unit, should be adopted to recognize interference surges from fault ones.…”

Section: Introductionmentioning

confidence: 99%

Recognition of Traveling Surges in HVDC with Wavelet Entropy

Luo

Lin

Zhou

et al. 2017

Entropy

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Abstract:Traveling surges are commonly adopted in protection devices of high-voltage direct current (HVDC) transmission systems. Lightning strikes also can produce large-amplitude traveling surges which lead to the malfunction of relays. To ensure the reliable operation of protection devices, recognition of traveling surges must be considered. Wavelet entropy, which can reveal time-frequency distribution features, is a potential tool for traveling surge recognition. In this paper, the effectiveness of wavelet entropy in characterizing traveling surges is demonstrated by comparing its representations of different kinds of surges and discussing its stability with the effects of propagation distance and fault resistance. A wavelet entropy-based recognition method is proposed and tested by simulated traveling surges. The results show wavelet entropy can discriminate fault traveling surges with a good recognition rate.

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Directional Traveling-Wave Protection Based on Slope Change Analysis

Cited by 42 publications

References 5 publications

Traveling Wave-Based Protection Scheme for Inverter-Dominated Microgrid Using Mathematical Morphology

Traveling Wave-Based Protection Scheme for Inverter-Dominated Microgrid Using Mathematical Morphology

A novel negative sequence reactance based high speed directional relay algorithm

Recognition of Traveling Surges in HVDC with Wavelet Entropy

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