Multiobjective Optimization of Insulation Structure for Converter Transformer Valve-Side Bushings.
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| Title: | Multiobjective Optimization of Insulation Structure for Converter Transformer Valve-Side Bushings. |
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| Authors: | Xie, Da1, Wang, Wei1, Li, Yongchao2 1747402356@qq.com, Wei, Siyi1, Xu, Gang1, Ma, Long2 |
| Source: | Progress in Electromagnetics Research C. 2026, Vol. 168, p139-151. 13p. |
| Subjects: | Multi-objective optimization, Grey Wolf Optimizer algorithm, Electrostatic fields, AC DC transformers, Mathematical models, Bushings, High-voltage direct current transmission, Insulating materials |
| Abstract: | Valve-side bushings in HVDC converter transformers operate under composite AC-DC electric stresses, where temperature-dependent conductivity induces significant redistribution of electric field. In this study, a unified electro-thermal coupled model is developed for a 226 kV capacitive grading structure. Two insulation margin indices corresponding to DC lifetime stress and AC partial discharge stress are defined, and a multiobjective optimization model is formulated to minimize the normalized variances of both margins. An improved multiobjective grey wolf optimizer with a nonlinear convergence factor and a crowding-solution screening mechanism is proposed to enhance convergence and Pareto-solution quality. Results show that the improved algorithm yields better Pareto-solution diversity and uniformity than the standard method, while the optimized structure reduces the maximum DC and AC electric fields by about 6.2% and 10.4%, respectively. The proposed method provides an effective design approach for improving insulation coordination and reliability of valve-side bushings under composite AC-DC stresses. [ABSTRACT FROM AUTHOR] |
| Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 193303502 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Multiobjective Optimization of Insulation Structure for Converter Transformer Valve-Side Bushings. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Xie%2C+Da%22">Xie, Da</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Wei%22">Wang, Wei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Yongchao%22">Li, Yongchao</searchLink><relatesTo>2</relatesTo><i> 1747402356@qq.com</i><br /><searchLink fieldCode="AR" term="%22Wei%2C+Siyi%22">Wei, Siyi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xu%2C+Gang%22">Xu, Gang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+Long%22">Ma, Long</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 168, p139-151. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Multi-objective+optimization%22">Multi-objective optimization</searchLink><br /><searchLink fieldCode="DE" term="%22Grey+Wolf+Optimizer+algorithm%22">Grey Wolf Optimizer algorithm</searchLink><br /><searchLink fieldCode="DE" term="%22Electrostatic+fields%22">Electrostatic fields</searchLink><br /><searchLink fieldCode="DE" term="%22AC+DC+transformers%22">AC DC transformers</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br /><searchLink fieldCode="DE" term="%22Bushings%22">Bushings</searchLink><br /><searchLink fieldCode="DE" term="%22High-voltage+direct+current+transmission%22">High-voltage direct current transmission</searchLink><br /><searchLink fieldCode="DE" term="%22Insulating+materials%22">Insulating materials</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Valve-side bushings in HVDC converter transformers operate under composite AC-DC electric stresses, where temperature-dependent conductivity induces significant redistribution of electric field. In this study, a unified electro-thermal coupled model is developed for a 226 kV capacitive grading structure. Two insulation margin indices corresponding to DC lifetime stress and AC partial discharge stress are defined, and a multiobjective optimization model is formulated to minimize the normalized variances of both margins. An improved multiobjective grey wolf optimizer with a nonlinear convergence factor and a crowding-solution screening mechanism is proposed to enhance convergence and Pareto-solution quality. Results show that the improved algorithm yields better Pareto-solution diversity and uniformity than the standard method, while the optimized structure reduces the maximum DC and AC electric fields by about 6.2% and 10.4%, respectively. The proposed method provides an effective design approach for improving insulation coordination and reliability of valve-side bushings under composite AC-DC stresses. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2528/PIERC26020912 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 139 Subjects: – SubjectFull: Multi-objective optimization Type: general – SubjectFull: Grey Wolf Optimizer algorithm Type: general – SubjectFull: Electrostatic fields Type: general – SubjectFull: AC DC transformers Type: general – SubjectFull: Mathematical models Type: general – SubjectFull: Bushings Type: general – SubjectFull: High-voltage direct current transmission Type: general – SubjectFull: Insulating materials Type: general Titles: – TitleFull: Multiobjective Optimization of Insulation Structure for Converter Transformer Valve-Side Bushings. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Xie, Da – PersonEntity: Name: NameFull: Wang, Wei – PersonEntity: Name: NameFull: Li, Yongchao – PersonEntity: Name: NameFull: Wei, Siyi – PersonEntity: Name: NameFull: Xu, Gang – PersonEntity: Name: NameFull: Ma, Long IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 19378718 Numbering: – Type: volume Value: 168 Titles: – TitleFull: Progress in Electromagnetics Research C Type: main |
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