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The influence of turbine generator rotor damping structure and material on first swing stability

机译：汽轮发电机转子减振结构和材料对第一回转稳定性的影响

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In this paper, we study the influence of rotor damping structure and material on First Swing Stability (FSS) of turbine generator connected to power system after three-phase short circuit. Considering the complex rotor damping structure of turbine generator, we make crucial improvements in finite element discrete strategy reflecting skin effect of eddy current and establish field-circuit-network coupled time-step finite element model. We test this model by the experiment of 7.5 kW model machine. Based on this model, we take a 300 MW turbine generator as an example to study the influence of damping bar, rotor iron core and conductive slot wedge on FSS. We investigate the importance of the rotor damping structure to FSS and find its impact is not negligible. By comparing the FSS limits affected by three components of rotor clamping structure respectively, we conclude that the effect of rotor slot wedge and iron core is not linear superposition but Coupling relationship. Since we have several rotor slot wedge materials to choose from and the conductivity of these materials is different, we establish the relationship between FSS limit and conductivity of rotor slot wedge. The result shows that the FSS limit gradually increases as the conductivity of rotor slot wedge changes from sigma(al) (conductivity of aluminum alloy) to 0.05 sigma(al). (C) 2015 Elsevier B.V. All rights reserved.
机译：在本文中，我们研究了转子阻尼结构和材料对三相短路后连接到电力系统的涡轮发电机的第一摆动稳定性（FSS）的影响。考虑到涡轮发电机的转子阻尼结构复杂，我们对反映涡电流趋肤效应的有限元离散策略进行了重大改进，建立了场-电路-网络耦合时步有限元模型。我们通过7.5 kW模型机的实验对该模型进行了测试。在此模型的基础上，以一台300 MW汽轮发电机为例，研究了阻尼棒，转子铁心和导电槽楔对FSS的影响。我们研究了转子阻尼结构对FSS的重要性，并发现其影响不可忽略。通过比较分别受转子夹紧结构三个部件影响的FSS极限，我们得出结论，转子槽楔和铁芯的影响不是线性叠加，而是耦合关系。由于我们有几种转子槽楔形材料可供选择，并且这些材料的电导率不同，因此我们建立了FSS极限与转子槽楔形电导率之间的关系。结果表明，FSS极限随着转子槽楔的电导率从sigma（al）（铝合金的电导率）变化到0.05 sigma（al）而逐渐增加。 （C）2015 Elsevier B.V.保留所有权利。

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