双向全桥DC-DC变换器中大容量高频变压器绕组与磁心损耗计算

发布时间：2019-04-12 17:34

【摘要】：精确预估非正弦波激励下高频变压器绕组与磁心损耗、研究不同模态下变压器损耗的变化趋势,对于电力电子变压器(PET)精细化设计至关重要。在对PET中间级——隔离式双向全桥DC-DC变换器工作原理进行分析的基础上,建立变换器的近似等效电路模型,得到一种适用于隔离式双向全桥DC-DC变换器中高频变压器绕组损耗计算方法。在计算方波、梯形波电压激励下的磁心损耗时,推导出修正的Steinmetz经验公式简化解析计算式,引入仅与占空比和上升时间有关的修正系数,据此可直接利用正弦波激励下的损耗系数,快速获取典型工作模态下磁心损耗。设计制作一台1.2k V/0.3k V/5k V·A非晶合金磁心高频变压器试验模型,将所提方法的计算结果与有限元仿真和试验测量结果对比,验证了所提方法的有效性。
[Abstract]:It is very important to accurately predict the winding and core loss of high frequency transformer under non-sine wave excitation and to study the trend of transformer loss in different modes. It is very important for the (PET) fine design of power electronic transformer. Based on the analysis of the working principle of the PET intermediate stage-isolated bi-directional full-bridge DC-DC converter, the approximate equivalent circuit model of the converter is established. A method for calculating the winding loss of high frequency transformer in isolated bi-directional full-bridge DC-DC converter is presented. When calculating the magnetic core loss under the excitation of square wave and trapezoidal wave voltage, a simplified analytical formula of modified Steinmetz empirical formula is derived, and the correction coefficient related only to duty cycle and rise time is introduced. Based on this, the loss coefficient under sine wave excitation can be directly used to obtain the magnetic core loss in typical working modes. An experimental model of 1.2kV / 0.3kV / 5kV 路A amorphous alloy magnetic core high frequency transformer is designed and fabricated. The calculation results of the proposed method are compared with the results of finite element simulation and test measurement, and the validity of the proposed method is verified.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家重点研发计划(2017YFB0903902) 国家自然科学基金(51677064) 新能源电力系统国家重点实验室开放课题(LAPS2016-16)资助项目
【分类号】：TM433

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