Detection and location of voltage sags based on mathematical morphology and grille fractal

Huang, Renji; Wang, F. H.; Zhang, J.; Duan, R. C.

doi:10.1109/tdc.2014.6863302

Cited by 5 publications

(12 citation statements)

References 4 publications

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“…These TSCT-TADF emitters exhibited PLQYs > 90% and k r of nearly 10 7 s −1 , and device EQE max reached 21.0 and 27.8% for mCz-Xo-TRZ and dCz-Xo-TRZ, respectively. 28 The above results show that TSCT-TADF emitters can overcome the inherent disadvantages, such as low k r and large structural relaxation, through rational molecular skeleton design and reach or exceed the expected luminescence performance of TBCT-TADF emitters.…”

Section: ■ Introductionmentioning

confidence: 76%

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Intramolecular Through-Space Charge Transfer in Compact Cofacial Thermally Activated Delayed Fluorescence Emitters

Li,

Kuang,

Situ

et al. 2024

J. Phys. Chem. C

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In terms of the molecular design for thermally activated delayed fluorescence (TADF), the high degree of spatial separation of frontier molecular orbitals can be achieved through constructing cofacial donor−acceptor alignment in a through-space charge transfer (TSCT) framework. When extremely low ΔE ST is realized, TSCT-TADF molecules still suffer a low radiative transition rate (k r ) of the emissive TSCT state. Compact TSCT-TADF emitters, mCz-Xo-TRZ and dCz-Xo-TRZ, have been reported, showing a high photoluminescence quantum yield (PLQY) with large k r . To explore the physical mechanism of high PLQY and large k r in the TSCT conformation, comprehensive theoretical calculations on geometries, excitation energies, transition character, strong and weak electronic coupling, and vibration analysis on structural reorganization accompanied by time-resolved spectroscopy were applied to illustrate the electronic coupling mechanism in the compact and rigid TSCT framework and reveal the limited structural relaxation contributing to the nonradiative dissipation in excited states. This work contributes a deep understanding of the electronic interaction mechanism in TSCT molecular frameworks and provides theoretical guidance for the rational design of TSCT luminescent materials.

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Section: ■ Introductionmentioning

confidence: 76%

“…The mCz-Xo-TRZ and dCz-Xo-TRZ were synthesized as previously reported. 28 For a comparative study, Cz-TRZ, 29 the donor Cz, which is directly connected to the acceptor TRZ, was purchased from Xi'an Polymer Light Technology Corp., Ltd. Solvents utilized in this work were obtained from InnoChem Chemicals (HPLC grade).…”

Section: Chemicalsmentioning

confidence: 99%

Intramolecular Through-Space Charge Transfer in Compact Cofacial Thermally Activated Delayed Fluorescence Emitters

Li,

Kuang,

Situ

et al. 2024

J. Phys. Chem. C

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“…Mathematical morphology (MM) [133][134][135][136][137][138][139][140][141][142][143][144][145][146][147] MM is a nonlinear signal processing tool. Computational burden involved with this method is very less, since the method uses simple arithmetic calculation and set theory.…”

Section: Wavelet Transform and Its Variants' Based Methodsmentioning

confidence: 99%

“…The MM-based feature extraction approaches are adopted by various authors to identify and classify the stationary/nonstationary PQ disturbances in the previous studies. [135][136][137][138][139][140][141][142][143][144][145][146][147] Lu et al 135 presented a morphological transform technique to extract the features corresponding to the PQ disturbances in time domain. Moreover, it also highlights the importance of the proposed technique to detect the location and duration of disturbances.…”

Section: Mathematical Morphology-based Methodsmentioning

confidence: 99%

“…In Zhang et al, 142 the authors proposed a new PQD detection approach using MM and radial coordinate visualization (Radviz). Huang et al 143 presented a voltage sag detection approach using a morphology filter and grille fractal. Chakravorti and Dash 144 presented MM and fuzzy DT-based technique for automatic PQD&C. Chen et al 145 presented a morphology singular entropy-based PQ detection method.…”

Section: Mathematical Morphology-based Methodsmentioning

confidence: 99%

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Power quality disturbance detection and classification using signal processing and soft computing techniques: A comprehensive review

Mishra

2019

Int Trans Electr Energ Syst

130

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Summary Power quality (PQ) studies have gained huge attention from the academics and the industry over the past three decades. The main objective of this article is to provide a comprehensive review on the state‐of‐the‐art techniques based on digital signal processing (DSP) and machine learning for automatic recognition of PQ events. It is aimed to present extensive information on the status of detection and classification of PQ events to the academics following a line of investigation on the similar domain. On the other hand, microgrid is one of the emerging architecture under the umbrella of smart grid infrastructure. In microgrid environment, the integration of renewable energy sources and distributed generators boosts the application of power electronic technology, which is the main cause of various PQ issues. Therefore, various PQ detection and classification (PQD&C) schemes for microgrid application using DSP and machine learning techniques have been reviewed in this article. Moreover, a comparative assessment on various PQD&C techniques has been carried out in details considering several criteria, such as type of data used (synthetic or real world), type of PQ disturbance studied (single or multiple), and performance in terms of accuracy (both noiseless and noisy environment). Hence, several types of research work in PQD&C area, such as the detection principles, benefits, and weaknesses of former works related to each PQD&C technique, are tinted in this manuscript. Therefore, from this review, the opportunities in PQD&C research domain in the power system can be explored further.

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Optimal Structuring Element Selection Guidelines of Morphological Filter for Power Quality Signal Denoising

Liu

Zhang

2023

Arab J Sci Eng

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Detection and location of voltage sags based on mathematical morphology and grille fractal

Cited by 5 publications

References 4 publications

Intramolecular Through-Space Charge Transfer in Compact Cofacial Thermally Activated Delayed Fluorescence Emitters

Intramolecular Through-Space Charge Transfer in Compact Cofacial Thermally Activated Delayed Fluorescence Emitters

Power quality disturbance detection and classification using signal processing and soft computing techniques: A comprehensive review

Optimal Structuring Element Selection Guidelines of Morphological Filter for Power Quality Signal Denoising

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