英语翻译4.Advanced electromagnetic using WAVE It is important th

英语翻译
4.Advanced electromagnetic using WAVE
It is important that designers of large synchronous machines be able to evaluate their designs in terms of various performance parameters.However,an accurate prediction of the electromagnetic performance,such as,negative sequence rotor heating,requires prohibitive computing resources for time-stepping finite element modeling and solution.This is especially true for machines with fractional slot windings where the field solution requires modeling of large number of pole pitches.Recently,a paper was presented [11] describing the development of the software package WAVE.The same software tool was also for the negative sequence heating studies [12].These studies show the potential of the software for applications that have not been explored previously.To verify the calculated results obtained using WAVE software,experiments were performed on a synchronous machine (0.654 MVA,1 kV,1200 rpm 60 Hz) by simulating the negative sequence fields using phase-phase short circuit [121.Table 3 shows the calculated damper bar currents by the WAVE software for 20% negative sequence current and the frequencies at which significant currents are induced.The predicted dampers bars currents are in good agreement with tests results [12].
The software tool based on a permeance and MMF model require considerably less CPU times than the full time- stepping finite element simulations.The new tool shows promising results for applications to machines with fractional slot windings requiring prohibitive amounts of computing resources for time-stepping finite element solutions.
5.Conclusion
The new automated design optimisation process introduced by GE Hydro is able to perform trade-off and design sensitivity studies to determine the benefit of modifying design constraints and improving enabling technologies.The use of electromagnetic finite element codes for the design phase of hydroelectric generators has been described.Special emphasis has been laid on time step finite element program and on the new software tool for steady state time-harmonic field solution in salient pole synchronous machines based on a permeance and MMF model.The latter requires considerably less CPU time than the full time-stepping finite element simulations.The wave program shows promising results for applications to machines with fractional slot windings requiring Prohibitive amounts of computing resources for time-stepping finite element solutions.
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4.先进的电磁波动
它是重要的,设计师能够评估大型同步机的设计方面的各项性能参数.然而,准确预测的电磁性能,如,负序转子加热,要求禁止计算资源有限元建模和解决元件这尤其适用于机器以分数槽绕组的领域的建模解决需要大量的杆投球.最近,一篇论文给出了描述软件发展的浪潮相同的软件工具,也为负序加热研究.这些研究表明这些潜在的软件,可广泛应用于尚未探究以前计算结果验证了利用波软件、实验进行了同步机,1千0.654供电量,1200每分钟转速60赫兹)通过模拟负序领域用phase-phase短路(121 .表3显示电流的计算阻尼杆为20%的负面波动的软件和频率序电流,电流是诱发显著…预测器酒吧电流的预测值与试验结果.
该软件工具,根据需要,MMF模型渗入得较少的CPU时间比充分的时间步有限元模拟,…这个新工具显示有前途的结果应用到机器以分数槽绕组需要大量的计算资源禁止性元件的有限元解.
5.结论
新的自动化设计优化过程是由GE水力平衡,能够进行研究,以确定设计敏感性的修改和提高关键技术设计约束的.利用电磁有限元水力设计阶段的发电机被描述侧重对时间步有限元程序,在新的软件工具领域中time-harmonic稳态解凸极同步机基于渗入,MMF模型后者要大大减少CPU时间比元件的有限元模拟波程序显示了可喜成果应用到机器以分数槽绕组需要大量的计算资源禁止性元件的有限元解.
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