Refining the physical description of charge trapping and detrapping in a transport model for dielectrics using an optimization algorithm

IF 1 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Compel-The International Journal for Computation and Mathematics in Electrical and Electronic Engineering Pub Date : 2023-11-14 DOI:10.1108/compel-04-2023-0143
Khaled Hallak, Fulbert Baudoin, Virginie Griseri, Florian Bugarin, Stephane Segonds, Severine Le Roy, Gilbert Teyssedre
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Abstract

Purpose The purpose of this paper is to optimize and improve a bipolar charge transport (BCT) model used to simulate charge dynamics in insulating polymer materials, specifically low-density polyethylene (LDPE). Design/methodology/approach An optimization algorithm is applied to optimize the BCT model by comparing the model outputs with experimental data obtained using two kinds of measurements: space charge distribution using the pulsed electroacoustic (PEA) method and current measurements in nonstationary conditions. Findings The study provides an optimal set of parameters that offers a good correlation between model outputs and several experiments conducted under varying applied fields. The study evaluates the quantity of charges remaining inside the dielectric even after 24 h of short circuit. Moreover, the effects of increasing the electric field on charge trapping and detrapping rates are addressed. Research limitations/implications This study only examined experiments with different applied electric fields, and thus the obtained parameters may not suit the experimental outputs if the experimental temperature varies. Further improvement may be achieved by introducing additional experiments or another source of measurements. Originality/value This work provides a unique set of optimal parameters that best match both current and charge density measurements for a BCT model in LDPE and demonstrates the use of trust region reflective algorithm for parameter optimization. The study also attempts to evaluate the equations used to describe charge trapping and detrapping phenomena, providing a deeper understanding of the physics behind the model.
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使用优化算法改进介电体输运模型中电荷捕获和去捕获的物理描述
本文的目的是优化和改进用于模拟绝缘聚合物材料,特别是低密度聚乙烯(LDPE)中的电荷动力学的双极电荷输运(BCT)模型。设计/方法/方法采用一种优化算法,通过将模型输出与脉冲电声(PEA)方法的空间电荷分布和非平稳条件下的电流测量两种测量方法获得的实验数据进行比较,对BCT模型进行优化。该研究提供了一组最优参数,使模型输出与在不同应用领域进行的若干实验之间具有良好的相关性。该研究评估了即使在短路24小时后介电介质内剩余的电荷量。此外,还讨论了增加电场对电荷捕获率和电荷脱除率的影响。本研究只考察了不同外加电场的实验,当实验温度发生变化时,所得参数可能与实验结果不相符。进一步的改进可以通过引入额外的实验或其他测量源来实现。这项工作为LDPE中的BCT模型提供了一组最适合电流和电荷密度测量的独特最佳参数,并演示了使用信任域反射算法进行参数优化。该研究还试图评估用于描述电荷捕获和脱陷现象的方程,从而对模型背后的物理原理有更深的理解。
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来源期刊
CiteScore
1.60
自引率
0.00%
发文量
124
审稿时长
4.2 months
期刊介绍: COMPEL exists for the discussion and dissemination of computational and analytical methods in electrical and electronic engineering. The main emphasis of papers should be on methods and new techniques, or the application of existing techniques in a novel way. Whilst papers with immediate application to particular engineering problems are welcome, so too are papers that form a basis for further development in the area of study. A double-blind review process ensures the content''s validity and relevance.
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