定点时间周期有限元法及其在变压器直流偏磁特性分析中的应用

发布时间：2018-01-17 13:25

本文关键词：定点时间周期有限元法及其在变压器直流偏磁特性分析中的应用　出处：《中国电机工程学报》2017年17期 　论文类型：期刊论文

【摘要】：根据稳态激励下电磁场场量周期性变化的特点,以矢量磁位和激磁电流为未知量,利用场路耦合的时间周期有限元法对变压器直流偏磁问题进行研究。采用能量法确定2D磁系统等效厚度,结合局部收敛的固定点法,选择合适的收敛因子及方程初值,有效地提高了基于场路耦合的时间周期有限元法方程的计算精度和计算效率。针对叠片铁心模型进行了不同条件下直流偏置的实验和计算,计算结果和测量结果基本吻合,验证了该方法在变压器直流偏磁计算中的适用性。通过人为增大电阻,设置补偿电压,为变压器在直流偏磁计算中因内阻小,电感变化剧烈而引起的不稳定问题提供了一个解决思路。
[Abstract]:According to the characteristics of periodic variation of electromagnetic field field under steady state excitation, vector magnetic potential and exciting current are taken as unknown quantities. The field coupling time period finite element method is used to study the DC bias of transformer. The equivalent thickness of 2D magnetic system is determined by energy method, and the fixed point method of local convergence is used. Select the appropriate convergence factor and the initial value of the equation. The calculation accuracy and efficiency of the time-periodic finite element method based on field-circuit coupling are improved effectively. Experiments and calculations of DC bias under different conditions are carried out for the laminated core model. The calculation results are in good agreement with the measured results, which verify the applicability of this method in the calculation of DC bias of transformer. By artificially increasing the resistance and setting the compensation voltage, the internal resistance of the transformer is small in the calculation of DC bias. The instability caused by the drastic change of inductance provides a solution to the problem.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);华北电力大学电气与电子工程学院;全球能源互联网研究院;
【基金】：国家863高技术基金项目(2012AA050401) 国家电网公司科技项目(SGRI-DL-71-12-005) 国家自然科学基金项目(51277064)~~
【分类号】：TM41
【正文快照】： 0引言当直流电流流入变压器绕组中,会使变压器铁心急剧饱和,引起变压器局部过热,振动与噪声加剧,铁心损耗增加等,即发生变压器直流偏磁的现象[1-2]。变压器直流偏磁产生的原因主要有3种:1)太阳磁暴周期性地变化产生了准直流(频率0.01Hz,近似为直流)[2-4];2)高压直流输电系统

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