水轮发电机定子线棒股线电流计算与换位方式优化
发布时间：2018-10-09 19:11
【摘要】：随着电力工业的增长以及水轮发电机组生产制造水平的提高,水轮发电机的单机容量不断增大,其漏磁场也不断增大,同时由于定子线棒漏磁场分布不均匀而产生的环流损耗也越来越大,导致定子线棒温升过高从而使得水轮发电机的发热问题愈加严重,严重危害其安全稳定运行。因此,定子线棒须采用合理的换位方式来减小环流损耗。针对现有计算定子线棒股线电流的方法中槽部漏电抗计算方法是一个隐式算法,很难与优化算法相结合的问题,本文提出了一种含股线槽部漏电抗显式算法的改进股线回路法,并以一台140MVA的水轮发电机为例,采用该方法计算了额定工况下定子线棒股线电流值和相角值,并将改进股线回路法与优化算法相结合对定子线棒换位方式进行优化。首先,根据股线回路法的基本原理建立股线电流求解方程,并给出定子线棒股线端部漏电抗计算公式,采用镜像法和离散积分法计算定子线棒股线端部漏电抗,然后推导不完全换位、空换位以及混合换位股线槽部漏电抗显式算法。其次,采用含股线槽部漏电抗显式算法的改进股线回路法分别计算定子线棒采用不完全换位、空换位以及混合换位时额定工况下股线电流值和相角值,并与实验测量值及三维有限元法计算值结果对比验证含股线槽部漏电抗显式算法的改进股线回路法准确性。最后,将含股线槽部漏电抗显式算法的改进股线回路法分别与基本蚁群算法、遗传算法和混合蚁群算法相结合,以环流损耗最小为优化目标对不完全换位、空换位以及混合换位定子线棒换位方式进行优化。然后将改进股线回路法与非支配排序遗传算法(NSGA-Ⅱ)算法相结合,以线棒环流损耗最小和股线电流方差最小为优化目标对混合换位定子线棒换位方式进行优化。同时,为了方便水轮发电机生产厂家对定子线棒换位方式进行优化,开发一套含定子线棒股线电流方差计算、环流损耗计算以及定子线棒换位方式优化功能的软件。
[Abstract]:With the growth of the power industry and the improvement of the production and manufacturing level of the hydrogenerator, the single unit capacity of the hydrogenerator is increasing, and the magnetic flux leakage of the hydrogenerator is also increasing. At the same time, the circulation loss caused by the non-uniform distribution of magnetic flux leakage of stator rod is also increasing, which leads to the high temperature rise of stator bar, which makes the heating problem of hydrogenerator more serious, and seriously endangers its safe and stable operation. Therefore, the stator bar should be transposed reasonably to reduce the circulation loss. In order to solve the problem that the calculation method of slot leakage reactance is an implicit algorithm, which is difficult to be combined with the optimization algorithm, an improved strand circuit method is proposed in this paper. Taking a hydrogenerator of 140MVA as an example, the current value and phase angle value of stator rod are calculated under rated working conditions, and the stator wire bar transposition mode is optimized by combining the improved strands loop method with the optimization algorithm. First of all, according to the basic principle of the wire loop method, the equation of current solution is established, and the formula for calculating the leakage reactance at the end of the stator rod is given, and the leakage reactance of the end of the stator rod is calculated by the mirror image method and the discrete integration method. Then the explicit algorithms of leakage reactance in slot of incomplete transposition, empty transposition and mixed transposition are deduced. Secondly, the current value and phase angle value of the stator bar under the condition of incomplete transposition, empty transposition and mixed transposition are calculated by the improved strands loop method with the explicit method of leakage reactance in the grooves of the strands, respectively. Compared with the experimental results and the calculated results of 3D finite element method, the accuracy of the improved method is verified by using the explicit method of leakage reactance in grooves with strands. Finally, the improved strands loop method is combined with basic ant colony algorithm, genetic algorithm and hybrid ant colony algorithm respectively. The minimum circulation loss is considered as the optimal target for incomplete transposition. Air transposition and mixed transposition stator bar transposition are optimized. Then the improved strands loop method is combined with the NSGA- 鈪，
本文编号：2260462
[Abstract]:With the growth of the power industry and the improvement of the production and manufacturing level of the hydrogenerator, the single unit capacity of the hydrogenerator is increasing, and the magnetic flux leakage of the hydrogenerator is also increasing. At the same time, the circulation loss caused by the non-uniform distribution of magnetic flux leakage of stator rod is also increasing, which leads to the high temperature rise of stator bar, which makes the heating problem of hydrogenerator more serious, and seriously endangers its safe and stable operation. Therefore, the stator bar should be transposed reasonably to reduce the circulation loss. In order to solve the problem that the calculation method of slot leakage reactance is an implicit algorithm, which is difficult to be combined with the optimization algorithm, an improved strand circuit method is proposed in this paper. Taking a hydrogenerator of 140MVA as an example, the current value and phase angle value of stator rod are calculated under rated working conditions, and the stator wire bar transposition mode is optimized by combining the improved strands loop method with the optimization algorithm. First of all, according to the basic principle of the wire loop method, the equation of current solution is established, and the formula for calculating the leakage reactance at the end of the stator rod is given, and the leakage reactance of the end of the stator rod is calculated by the mirror image method and the discrete integration method. Then the explicit algorithms of leakage reactance in slot of incomplete transposition, empty transposition and mixed transposition are deduced. Secondly, the current value and phase angle value of the stator bar under the condition of incomplete transposition, empty transposition and mixed transposition are calculated by the improved strands loop method with the explicit method of leakage reactance in the grooves of the strands, respectively. Compared with the experimental results and the calculated results of 3D finite element method, the accuracy of the improved method is verified by using the explicit method of leakage reactance in grooves with strands. Finally, the improved strands loop method is combined with basic ant colony algorithm, genetic algorithm and hybrid ant colony algorithm respectively. The minimum circulation loss is considered as the optimal target for incomplete transposition. Air transposition and mixed transposition stator bar transposition are optimized. Then the improved strands loop method is combined with the NSGA- 鈪，
本文编号：2260462
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