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改善空载电压波形、降低阻尼条损耗发热是优化电能质量、保障发电机与电网运行稳定性的重要问题。为此,采用调节阻尼绕组节距与定子斜槽措施相结合的设计方案,对1台30MW的大型贯流式水轮发电机空载电压波形和额定负载工况的阻尼条损耗发热进行了优化设计,并利用多层运动电磁场场路耦合时步有限元模型和三维温度场有限元模型进行了分析与计算。结果表明,在合理增大阻尼绕组节距的基础上,结合斜槽措施,既能明显地优化空载电压波形,又能有效地防止阻尼条过热故障的发生。计算结果与实测数据相符合。该研究结果对提高发电机的设计水平并改善发电机与电网的运行稳定性具有参考价值。
Improve the no-load voltage waveform and reduce the damping loss Heating is an important issue to optimize the power quality and protect the stability of the generator and grid operation. Therefore, the design scheme of adjusting the damping winding pitch and the stator chute is adopted to optimize the damping loss heating of a 30MW large tubular turbine generator under no-load voltage waveform and rated load condition The finite element model and the finite element model of three-dimensional temperature field are analyzed and calculated by using multi-layer moving electromagnetic field-circuit coupled time-step finite element model. The results show that not only the no-load voltage waveform can be obviously optimized, but also the overheat failure of the damping bar can be effectively prevented on the basis of reasonable increase of the damper winding pitch and the combination of the chute measures. The calculated results are consistent with the measured data. The results of this study have reference value for improving the design level of generator and improving the operation stability of generator and grid.