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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