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] |
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| Database: | Engineering Source |
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