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基于阻抗边界法的换流变压器箱壳谐波损耗计算

DOI: 10.13336/j.1003-6520.hve.2015.09.049, PP. 3171-3176

Keywords: 谐波损耗,换流变压器,阻抗边界法,有限元法,特高压直流,时谐场

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Abstract:

为了研究阻抗边界法在换流变压器谐波损耗分析中的适用性,首先利用该方法对线圈-铝板结构的模型进行了谐波损耗分析,并与传统有限元法进行了对比研究。相对于传统有限元法,阻抗边界法不必对介质内部进行剖分,传统方法则必须对线圈和损耗介质内部同时进行剖分。在网格数较少的情况下,阻抗边界法与传统有限元法计算结果一致,且前者的计算时间更短,对计算机的性能要求更低。另外,基于阻抗边界法对三相换流变压器进行了内部磁场和谐波损耗计算。结果表明变压器箱壳的材料属性和工作条件符合阻抗边界法要求的半无限大导体假设,即导体上包含电磁波部分的尺寸远小于导体外电磁波波长,且导体本身尺寸远大于导体内的电磁波波长,在换流变压器的谐波分析至最高49次谐波时,频率都符合这2个条件;利用该方法计算得到三相换流变压器的谐波损耗,验证了阻抗边界法适用于大型换流变压器的谐波损耗计算。

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