干式空心电抗器绕组过电压时域快速计算方法的研究

发布时间：2019-03-20 14:52

【摘要】：为了研究雷电波激励作用下干式空心电抗器绕组的内部过电压,本文基于部分单元等效电路(PEEC)方法建立了干式空心电抗器的精细电路模型,并对电抗器绕组电磁参数进行了提取,分析了电容参数的稀疏方法。由于所研究电抗器绕组线匝数量庞大,普通计算机难以支持其运算,因此在所建立的电路模型基础上利用波形松弛法进行模型的迭代求解。考虑到波形松弛法的收敛速度与系统分解后各个子网络间的耦合强弱密切相关,本文采用重叠分区技术实现系统分解,大大加快了算法的收敛速度,并分析了不同重叠部分与不同分块子系统数对迭代效率的影响。本文的结尾,通过试验与算例分析对模型和参数提取以及算法的正确性进行了验证,并利用本文的方法对一台实际35k V干式空心并联电抗器在雷电波激励下的电压分布进行了计算,通过计算得到了电抗器内部电位分布情况以及匝间、分支间和包封间电压分布规律。
[Abstract]:In order to study the internal overvoltage of the dry-type hollow reactor winding under the excitation of the lightning wave, the fine circuit model of the dry-type hollow reactor is established based on the partial-element equivalent circuit (PEEC) method, and the electromagnetic parameters of the reactor winding are extracted. The sparse method of the capacitance parameter is analyzed. Because of the large number of winding turns of the reactor, it is difficult for the general computer to support its operation, so on the basis of the established circuit model, the iterative solution of the model is carried out by using the waveform relaxation method. Considering that the convergence rate of the waveform relaxation method is closely related to the coupling strength between the sub-networks after the system is decomposed, the decomposition of the system is realized by using the overlapping partition technique, and the convergence speed of the algorithm is greatly accelerated. The effect of different overlapping parts and the number of different block sub-systems on the iteration efficiency is also analyzed. At the end of this paper, the correctness of the model and parameter extraction and the algorithm is verified by the experimental and numerical examples, and the voltage distribution of a real 35k V dry hollow parallel reactor under the excitation of the lightning wave is calculated by the method of this paper. The distribution of the internal potential of the reactor and the distribution of the voltage between the turn-to-turn, the inter-branch and the envelope are obtained.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM47

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