水轮发电机定子线棒端部联接方式及温度场分析

发布时间：2018-05-12 17:50

本文选题：水轮发电机 + 线棒换位　；参考：《哈尔滨理工大学》2014年硕士论文

【摘要】：为了减小水轮发电机定子线棒股线内的环流损耗，股线换位的方法被广泛地应用。然而，即使在换位的线棒内，线棒两端端部的漏磁不等，，仍然能导致定子线棒股线间的电势不平衡，产生环流损耗。从水轮发电机发展趋势来看，单机容量越来越大，定子线棒环流损耗也随之增加，由此造成的电机温升不均以及局部温升过高等问题严重影响电机效率和安全运行。研究表明线棒端部均匀分组联接的方法可以减小这部分环流损耗。由于一些水轮发电机定子线棒端部难以均匀分组，而不均匀分组联接环流计算尚无成熟方法，本文针对这一难题展开研究。首先，以漏感电势法为基础，对端部不均匀分组联接时的环流计算公式进行了推导，给出了大型水轮发电机定子线棒端部不均匀分组联接的环流损耗计算方法，并对一台样机进行了计算，对不分组和分组时定子线棒股线环流损耗的分布情况作了对比分析。同时整合了定子线棒换位优化设计及定子线棒端部分组联接，利用高级编程软件Visual Basic6.0开发了一套定子线棒优化设计及环流损耗计算软件。其次，建立定子线棒三维场路耦合模型，对定子漏磁场做了详细分析，通过改变外电路模拟定子线棒端部分组联接，对不同联接方式下的股线环流损耗进行分析，进一步验证分组联接对环流损耗的抑制作用。最后，建立了定子通风沟三维流体传热耦合模型，详细分析定子通风沟流体场及温度场，对定子线棒端部采用不同联接方式时的定子通风沟模型中各部件的温升情况作了对比分析，总结了温升变化规律。
[Abstract]:In order to reduce the circulation loss in the stator bar of hydrogenerator, the method of transposition of the strand is widely used. However, even in the transposed wire rod, the magnetic flux leakage at both ends of the rod is unequal, which still leads to the imbalance of the electric potential between the stator rod and the strand, resulting in the circulation loss. According to the development trend of hydrogenerator, the loss of stator bar circulation increases with the increasing capacity of the single generator, and the resulting problems such as uneven temperature rise and excessive local temperature rise seriously affect the efficiency and safe operation of the motor. It is shown that the method of uniform grouping at the end of the wire bar can reduce the loss of this part of the circulation. Due to the difficulty of uniform grouping at the end of stator bar of some hydrogenerators and the lack of a mature method to calculate the circulation of non-uniform grouping connection, this paper studies this problem. Firstly, based on the leakage inductive EMF method, the formula for calculating the circulation in the end non-uniform grouping connection is derived, and the method for calculating the circulation loss of the non-uniform grouping connection of the stator bar of the large hydrogenerator is given. At the same time, a prototype is calculated, and the distribution of the circulation loss of stator rod is compared and analyzed when the stator rod is not grouped and grouped. At the same time, the optimal design of stator bar transposition and the grouping connection of stator bar end are integrated, and a set of software of stator bar optimal design and circulation loss calculation is developed by using advanced programming software Visual Basic6.0. Secondly, the three-dimensional coupling model of stator bar is established, and the leakage magnetic field of stator is analyzed in detail. By changing the external circuit to simulate the end part of stator bar, the loss of strand circulation under different connection modes is analyzed. The effect of grouping connection on the circulation loss is further verified. Finally, the three-dimensional heat transfer coupling model of stator ventilation ditch is established, and the flow field and temperature field of stator ventilation ditch are analyzed in detail. The temperature rise of various components in the stator ventilation ditch model with different connection modes at the end of the stator bar is compared and analyzed, and the variation law of the temperature rise is summarized.
【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

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