大型水轮发电机定子线棒换位与环流损耗分析计算

发布时间：2018-03-20 03:06

本文选题：水轮发电机　切入点：股线换位　出处：《哈尔滨理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于水轮发电机容量的不断增大，定子股线中的循环电流和环流损耗越来越大，在大型发电机设计时准确计算股线环流损耗是十分必要的。本文以180MW水轮发电机为研究对象，，使用解析法和数值法分别计算不同换位情况下的股线中循环电流和环流损耗，并对这两种计算方法比较分析，可为求取股线中的循环电流和环流损耗提供更加准确的计算方法。首先，简要介绍股线回路法和漏感电势法计算股线环流损耗方法，并使用漏感电势法计算定子股线在进行360全换位时、不足360换位在不同换位角度情况时、360空换位在不同空换位段长度情况时以及延长360换位时的股线循环电流和环流损耗。其次，对数值法计算股线循环电流和环流损耗进行简单的描述，并使用数值法计算360全换位、不足360换位在空三根股线以及360空换位在空换位段长度为434mm时的股线循环电流和环流损耗，并分析不足360换位在不同换位角度情况下、360空换位在不同空换位段长度及空换位段在槽中不同位置处时的股线循环电流和环流损耗。最后，将漏感电势法和数值法计算的股线环流损耗进行对比分析；并提取数值法股线周围的槽部漏磁场和端部漏磁场分布图，与漏感电势法中的槽部漏磁场和端部漏磁场假设分布进行对比分析，说明解析计算方法的不足以及数值计算方法的必要性和准确性。
[Abstract]:Due to the increasing capacity of hydrogenerator, the circulating current and circulation loss in stator strands are more and more large. It is necessary to accurately calculate the circulation loss in the design of large generators. In this paper, 180 MW hydrogenerator is taken as the research object. The analytical method and numerical method are used to calculate the circulating current and circulation loss in the strands under different transposition conditions respectively. The comparison and analysis of these two methods can provide a more accurate calculation method for calculating the circulating current and circulation loss in the strands. Firstly, this paper briefly introduces the method of loop method and leakage inductance potential method to calculate the current loss of strand line, and uses the leakage inductance potential method to calculate the stator strand line when 360 full transposition is carried out. For less than 360 transposition at different transposition angles, the circulating current and circulation loss of the strands in the case of different length of the transposition section and the prolongation of the transposition of 360 are obtained. Secondly, the numerical method is used to calculate the circulating current and the circulation loss of the wire, and the total transposition of 360 is calculated by the numerical method. The circulating current and circulation loss of the three strands in the space and the length of the transposition section in the empty transposition section are 434mm and 434mm respectively in the case of less than 360 transposition and 360 empty transposition at the same time. Under different transposition angles, the circulating current and circulation loss of the under360 transposition at different lengths of the transposition section and the different positions of the empty transposition section in the slot are analyzed. Finally, the leakage inductance potential method and the numerical method are compared and analyzed, and the distributions of the slot magnetic field and the end leakage magnetic field around the strand line are obtained. Compared with the hypothesis distribution of slot leakage magnetic field and end leakage magnetic field in the leakage inductive potential method, the deficiency of analytical calculation method and the necessity and accuracy of numerical calculation method are explained.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM312

【引证文献】