近年来,随着高频电力电子磁元件不断发展,双有源桥变换器(dual active bridge,DAB)拓扑受到广泛应用。DAB传递功率需要变压器串联较大电感,传统分立磁件方案采用变压器及独立电感串联,功率密度低,而现有磁集成结构存在励磁电感下降、损...近年来,随着高频电力电子磁元件不断发展,双有源桥变换器(dual active bridge,DAB)拓扑受到广泛应用。DAB传递功率需要变压器串联较大电感,传统分立磁件方案采用变压器及独立电感串联,功率密度低,而现有磁集成结构存在励磁电感下降、损耗高等问题。为此,文中研究一种磁芯中柱设置分布式气隙的磁集成结构,建立其励磁电感解析模型,对分立磁件方案、传统磁集成方案与所提结构进行系统比较,并制作样机证明所提结构具有低损耗、小体积等优点;此外,为准确计算该结构漏感并在优化设计中实现漏感精准控制,提出基于双二维法的漏感建模方法。首先,针对所提结构建立主视图和左视图的双二维计算模型,为考虑三维下气隙扩散磁通影响,提出气隙修正系数以改进双二维计算精度;其次,针对影响漏感因素进行系统的参数灵敏度分析,以此进行归一化处理及参数扫描;然后,采用基于蚁群算法的BP神经网络建立漏感计算模型;最后,通过3台样机测试,验证漏感模型的准确性。展开更多
A two-dimensional numerical model was used to explain the liquefaction mechanism of double sand lenses and the corresponding soil deformation due to the cyclic loading. Moreover, in order to investigate the influences...A two-dimensional numerical model was used to explain the liquefaction mechanism of double sand lenses and the corresponding soil deformation due to the cyclic loading. Moreover, in order to investigate the influences of the soil characteristics and input loading data a parametric study was carried out on the essential parameters affecting the soil settlement, and so the variation of these parameters with the corresponding displacements was mainly examined. At last, the results obtained from the numerical analyses of double sand lenses and a continuous sand layer with similar characteristics were compared with those of an estimating method proposed by ISHIHARA and YOSHIMINE. The comparisons show that the settlements due to liquefaction of the continuous sand layer in both numerical and the estimating method are in a good agreement with and are obviously greater than those of double sand lenses.展开更多
文摘近年来,随着高频电力电子磁元件不断发展,双有源桥变换器(dual active bridge,DAB)拓扑受到广泛应用。DAB传递功率需要变压器串联较大电感,传统分立磁件方案采用变压器及独立电感串联,功率密度低,而现有磁集成结构存在励磁电感下降、损耗高等问题。为此,文中研究一种磁芯中柱设置分布式气隙的磁集成结构,建立其励磁电感解析模型,对分立磁件方案、传统磁集成方案与所提结构进行系统比较,并制作样机证明所提结构具有低损耗、小体积等优点;此外,为准确计算该结构漏感并在优化设计中实现漏感精准控制,提出基于双二维法的漏感建模方法。首先,针对所提结构建立主视图和左视图的双二维计算模型,为考虑三维下气隙扩散磁通影响,提出气隙修正系数以改进双二维计算精度;其次,针对影响漏感因素进行系统的参数灵敏度分析,以此进行归一化处理及参数扫描;然后,采用基于蚁群算法的BP神经网络建立漏感计算模型;最后,通过3台样机测试,验证漏感模型的准确性。
文摘A two-dimensional numerical model was used to explain the liquefaction mechanism of double sand lenses and the corresponding soil deformation due to the cyclic loading. Moreover, in order to investigate the influences of the soil characteristics and input loading data a parametric study was carried out on the essential parameters affecting the soil settlement, and so the variation of these parameters with the corresponding displacements was mainly examined. At last, the results obtained from the numerical analyses of double sand lenses and a continuous sand layer with similar characteristics were compared with those of an estimating method proposed by ISHIHARA and YOSHIMINE. The comparisons show that the settlements due to liquefaction of the continuous sand layer in both numerical and the estimating method are in a good agreement with and are obviously greater than those of double sand lenses.
