【摘要】：隨著電力工業(yè)的增長以及水輪發(fā)電機組生產(chǎn)制造水平的提高,水輪發(fā)電機的單機容量不斷增大,其漏磁場也不斷增大,同時由于定子線棒漏磁場分布不均勻而產(chǎn)生的環(huán)流損耗也越來越大,導(dǎo)致定子線棒溫升過高從而使得水輪發(fā)電機的發(fā)熱問題愈加嚴重,嚴重危害其安全穩(wěn)定運行。因此,定子線棒須采用合理的換位方式來減小環(huán)流損耗。針對現(xiàn)有計算定子線棒股線電流的方法中槽部漏電抗計算方法是一個隱式算法,很難與優(yōu)化算法相結(jié)合的問題,本文提出了一種含股線槽部漏電抗顯式算法的改進股線回路法,并以一臺140MVA的水輪發(fā)電機為例,采用該方法計算了額定工況下定子線棒股線電流值和相角值,并將改進股線回路法與優(yōu)化算法相結(jié)合對定子線棒換位方式進行優(yōu)化。首先,根據(jù)股線回路法的基本原理建立股線電流求解方程,并給出定子線棒股線端部漏電抗計算公式,采用鏡像法和離散積分法計算定子線棒股線端部漏電抗,然后推導(dǎo)不完全換位、空換位以及混合換位股線槽部漏電抗顯式算法。其次,采用含股線槽部漏電抗顯式算法的改進股線回路法分別計算定子線棒采用不完全換位、空換位以及混合換位時額定工況下股線電流值和相角值,并與實驗測量值及三維有限元法計算值結(jié)果對比驗證含股線槽部漏電抗顯式算法的改進股線回路法準確性。最后,將含股線槽部漏電抗顯式算法的改進股線回路法分別與基本蟻群算法、遺傳算法和混合蟻群算法相結(jié)合,以環(huán)流損耗最小為優(yōu)化目標對不完全換位、空換位以及混合換位定子線棒換位方式進行優(yōu)化。然后將改進股線回路法與非支配排序遺傳算法(NSGA-Ⅱ)算法相結(jié)合,以線棒環(huán)流損耗最小和股線電流方差最小為優(yōu)化目標對混合換位定子線棒換位方式進行優(yōu)化。同時,為了方便水輪發(fā)電機生產(chǎn)廠家對定子線棒換位方式進行優(yōu)化,開發(fā)一套含定子線棒股線電流方差計算、環(huán)流損耗計算以及定子線棒換位方式優(yōu)化功能的軟件。
[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，

本文編號：2260462