一种基于损耗模型的双有源桥DC-DC变换器效率优化方法

发布时间：2018-01-21 16:37

本文关键词： 双有源桥DC-DC变换器损耗模型高频隔离变压器电压转换比效率优化　出处：《电工技术学报》2017年14期 　论文类型：期刊论文

【摘要】：对双有源桥DC-DC变换器(DAB)系统中的各部分损耗进行建模,并依据此模型,以提升效率为目标,对DAB系统进行优化设计。首先,介绍单移相调制策略下的DAB工作原理,并推导漏电感电流有效值的解析表达式。为突出DAB的电流波形特征,引入电压转换比的概念,这一概念与变压器匝比相关。然后,介绍损耗建模方法。DAB系统的损耗主要分为两部分,一部分源于半导体器件;另一部分源于高频隔离变压器及电感。两者的损耗数值不仅由本身的材料特性决定,同时与运行工况紧密相关,如传输功率、电压、电流等。将单移相调制下的DAB电流、电压波形特征,与器件和变压器的本身特性结合考虑,解析建立DAB的稳态损耗模型。并在此基础上,通过数值计算的方法,对电压转换比进行优化设计,同时优化移相比的选择,增强软硬件的适配性,提升DAB的整体效率。最后,通过实验对所建损耗模型及优化方法进行了验证。
[Abstract]:The loss of each part of the dual-active bridge DC-DC converter system is modeled. According to this model, the optimization design of the DAB system is carried out in order to improve the efficiency. This paper introduces the working principle of DAB under single phase shift modulation, and deduces the analytical expression of the effective value of leakage inductive current. In order to highlight the characteristics of DAB current waveform, the concept of voltage conversion ratio is introduced. This concept is related to transformer turn ratio. Secondly, the loss modeling method of DAB system is introduced. The loss of DAB system is mainly divided into two parts, one part is from semiconductor devices; The other part is from the high frequency isolation transformer and inductor. The loss value of the transformer and inductor is not only determined by their own material characteristics, but also closely related to the operating conditions, such as transmission power, voltage. The characteristics of DAB current and voltage waveform under single phase shift modulation are combined with the characteristics of devices and transformers to establish the steady-state loss model of DAB analytically. Through the method of numerical calculation, the voltage conversion ratio is optimized and the choice of shift ratio is optimized to enhance the adaptability of software and hardware, and to improve the overall efficiency of DAB. The loss model and optimization method are verified by experiments.
【作者单位】：清华大学电机系电力系统及发电设备安全控制和仿真国家重点实验室;
【基金】：国家自然科学基金重大项目资助(51490680,51490683)
【分类号】：TM46
【正文快照】： 0引言随着环境的日益恶化,能源危机问题日渐突出,如何实现能源互联与高效节能是电力领域面临的新目标和挑战[1,2]。电能路由器是一种具有前瞻性的选择方案。而双有源桥(Dual Active Bridge,DAB)DC-DC变换器(后文简称DAB)作为电能路由器中的关键组成部分,不仅要承担电能路由器

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