大功率高频变压器关键技术与发展趋势

Key Issues and Development Prospects in High Power High-frequency Transformer

大功率高频变压器是固态变压器的核心部件,在未来新能源并网、海上风电、中压配网、轨道交通和数据中心供电中需求广泛。该文综述了大功率高频变压器研究的关键问题与发展趋势,论述了大功率高频铁芯的材料、损耗、结构设计与制造现状,分析了绕组材料与结构设计,指出了大功率高频铁芯与绕组的关键问题。同时讨论了高频高压绝缘与散热问题,分析了绝缘失效、可靠性与散热设计中的矛盾问题。最后阐述了大功率高频变压器在设计、测试与应用等方面研究现状,讨论了其高效高功率密度设计方法,深入分析了大功率高频变压器在效率、绝缘以及温升等性能测试方面存在的关键问题。

The high-power high-frequency transformer is the core component of power electronic transformers,which are widely demanded in future new grid connection,offshore wind power,medium-voltage distribution networks,rail transit and data center power supply.This article provides an overview of the key issues and development trends in the research on high-power high-frequency transformers.The current situation of materials,losses,structural design and manufacture of high-power high-frequency iron cores have also been discussed in the article.Some key issues related to high-power high-frequency iron cores and windings are addressed as well after overviewing the material and structural development on the current basis.The discussion focuses on the high-frequency high-voltage insulation and heat management system,as well as the conflicting issues in designing the insulation failure,reliability and heat dissipation.The design method of high power density is put forward,and the insulation system,temperature rise,and efficiency tests are also proposed through a review of the current status of the design,tests,and techniques.The key issues and development trends in high-power electronic transformers are finally discussed.