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.

中文翻译：

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使用优化算法完善电介质传输模型中电荷俘获和解俘获的物理描述

目的

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传输（BCT）模型。

设计/方法论/途径

应用优化算法来优化 BCT 模型，将模型输出与使用两种测量获得的实验数据进行比较：使用脉冲电声 (PEA) 方法的空间电荷分布和非平稳条件下的电流测量。

发现

该研究提供了一组最佳参数，使模型输出与在不同应用领域进行的多次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和去捕获速率的影响。

研究局限性/影响

本研究仅考察了不同施加电场的实验，因此如果实验温度变化，所获得的参数可能不适合实验输出。通过引入额外的实验或其他测量来源可以实现进一步的改进。

原创性/价值

这项工作提供了一组独特的最佳参数，与 LDPE 中 BCT 模型的电流和电荷密度测量最匹配，并演示了如何使用置信区域反射算法进行参数优化。该研究还尝试评估用于描述电荷捕获和去捕获现象的方程，从而更深入地了解模型背后的物理原理。