Determination of partial discharge development stage of oil-paper insulation based on sparse decomposition considering the effect of aging

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Shaosheng Geng, Min Li, Chunxin Wang, Qianqian Zhang, Qi Liu, Jun Xie
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Abstract

To realize the accurate determination of the partial discharge development stage of an oil-immersed power transformer by a method based on sparse decomposition is proposed in the insulation system of an oil-immersed power transformer. First, statistical parameters are extracted from the PD pulse signals to construct a complete atomic library. According to the sparse representation principle, the preliminary determination of the discharge stage can be realized by ignoring the influence of aging; secondly, to solve the influence of feature parameter correlation on the determination result, the statistical feature parameters are sparsely reconstructed to realize the ordering of the effectiveness of the statistical feature parameters; lastly, to take into account the influence of the aging of the insulating cardboard, the plausible weights of the aging factor are calculated, and the number of votes for the development stage of partial discharge is determined according to the Borda voting mechanism. Two typical discharge defect models are designed so that the PDs on which the work focuses are superficial, and the measured signals are used to verify the validity of this paper's method. The results show that the highest accuracy is 56.2% when ignoring the influence of insulation cardboard aging, and the accuracy of the decision is less than 75% when considering the influence of aging without sparse reconstruction of statistical feature parameters; the method in this paper has good recognition effect, and the recognition accuracy is improved by 38.6% compared with that of ignoring the influence of aging of the insulation cardboard, and the average can reach 94.2%.

Abstract Image

基于稀疏分解并考虑老化影响确定油纸绝缘局部放电发展阶段
为实现油浸式电力变压器局部放电发展阶段的精确测定,在油浸式电力变压器绝缘系统中提出了一种基于稀疏分解的方法。首先,从局部放电脉冲信号中提取统计参数,构建完整的原子库。根据稀疏表示原理,忽略老化的影响,实现放电阶段的初步判定;其次,为解决特征参数相关性对判定结果的影响,对统计特征参数进行稀疏重构,实现统计特征参数有效性的排序;最后,考虑绝缘纸板老化的影响,计算老化因子的可信权重,根据博尔达投票机制确定局部放电发展阶段的票数。设计了两个典型的放电缺陷模型,使工作重点关注的局部放电为浅层放电,并使用测量信号验证本文方法的有效性。结果表明,忽略绝缘纸板老化影响时,最高准确率为 56.2%,考虑老化影响而不进行统计特征参数稀疏重构时,判定准确率低于 75%;本文方法具有良好的识别效果,识别准确率比忽略绝缘纸板老化影响时提高了 38.6%,平均可达 94.2%。
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来源期刊
Electrical Engineering
Electrical Engineering 工程技术-工程:电子与电气
CiteScore
3.60
自引率
16.70%
发文量
0
审稿时长
>12 weeks
期刊介绍: The journal “Electrical Engineering” following the long tradition of Archiv für Elektrotechnik publishes original papers of archival value in electrical engineering with a strong focus on electric power systems, smart grid approaches to power transmission and distribution, power system planning, operation and control, electricity markets, renewable power generation, microgrids, power electronics, electrical machines and drives, electric vehicles, railway electrification systems and electric transportation infrastructures, energy storage in electric power systems and vehicles, high voltage engineering, electromagnetic transients in power networks, lightning protection, electrical safety, electrical insulation systems, apparatus, devices, and components. Manuscripts describing theoretical, computer application and experimental research results are welcomed. Electrical Engineering - Archiv für Elektrotechnik is published in agreement with Verband der Elektrotechnik Elektronik Informationstechnik eV (VDE).
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