Zheng Zhao, Lingfei Xiong, Kuan Zheng
Converter Transformer, Thermal Characteristics, Overload, FlowField, Field-Circuit Coupling
As a core component of offshore flexible DC power transmission sys- tems, the thermal characteristics and overload capacity of converter transformers have garnered significant attention. This study employs a field-circuit coupled calculation method that combines steady-state simulation and thermal circuit modeling to precisely evaluate these properties. Using Fluent, the temperature and flow fields of a 2D model are solved, examining the temperature-dependent variations in transformer oil’s density, specific heat capacity, and thermal con- ductivity. These findings enhance the accuracy of thermal field sim- ulations. Detailed descriptions of solid domain material properties and heat source configurations, including silicon steel, copper, and cellulose, are provided, along with heat flux density calculations for each low and high-voltage winding segment. Results indicate that the transformer’s hot spot is at the low-voltage winding top, with the high-voltage winding’s maximum temperature in the top seg- ment, and the highest internal oil flow velocity at the internal baffle. The field-circuit coupled model, considering real-time requirements, demonstrates higher computational accuracy than standard meth- ods through hotspot temperature calculations. These outcomes are highly valuable for improving the performance, reliability, and cost- effectiveness of offshore wind power transmission systems and ad- vancing the sustainable growth of the offshore wind energy sector.
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