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Characterising the d-axis machine model of a turbogenerator using finite elements

机译:使用有限元表征涡轮发电机的d轴机器模型

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摘要

An analysis of a long established fundamental assumption is presented. The assumption that superposition is valid in frequency response derived models is shown to be wrong, because eddy current losses in the solid rotor cannot be superimposed in the machine direct-axis. This implies that network theory is not valid in characterising the d-axis machine model. A machine model structure with one damper winding in the d-axis is derived from finite element analysis. Unequal mutual inductances in the machine d-axis are determined and hence the so-called differential leakage inductances are found and they are frequency dependent. The study is made on a 150 MVA turbine generator by simulating the standstill frequency response test with finite elements.
机译:提出了一个长期建立的基本假设的分析。在频率响应派生模型中叠加有效的假设被证明是错误的,因为不能将实心转子中的涡流损耗叠加在电机直轴上。这意味着网络理论在表征d轴机器模型方面无效。通过有限元分析得出了一种在d轴上带有一个阻尼绕组的机器模型结构。确定了机器d轴上的互感不相等,因此找到了所谓的差分漏感,并且它们与频率有关。通过使用有限元模拟静止频率响应测试,对150 MVA涡轮发电机进行了研究。

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