同步发电机多回路-有限元耦合数学模型及其应用

将多回路方法与电磁场有限元计算相结合,建立了同步发电机的多回路一有限元耦合数学模型,其突出优点在于可以计及定子绕组对地分布电容、磁路饱和、磁极形状、齿槽影响以及涡流等因素,因而适用于同步发电机定子单相接地故障暂态分析。分别应用多回路模型、多回路一有限元耦合模型进行定子绕组单相接地故障暂态数字仿真。仿真结果与实验结果对比表明,相对于多回路模型,多回路-有限元耦合模型具有更高精度。多回路-有限元耦合模型的仿真结果与实验结果基本吻合,验证了该模型的准确性与有效性。

Synchronous Generator MLM-FEM Coupled Mathematical Model and Its Application To Stator Ground Fault Transient Analysis

Synchronous generator mathematical model is of great interest as the theoretical foundation of performing fault transient simulation, extracting fault indicator and developing relay protection scheme. By combining multi-loop method (MLM) with finite element method (FEM), this paper puts forward a synchronous generator MLM-FEM coupled mathematical model, which possesses the distinguished capability to accurately include not only the distributed capacitances of the stator winding to the ground, but also a variety of nonlinearities such as magnetic saturation, pole shape, slot and eddy effect, ensuring its suitability for transient analysis of stator ground fault of generator. The numerical simulation of this type of Fault has been completed by using MLM and MLM-FEM coupled mathematical model respectively, along with the related experiments. The comparison between the simulation and experiment result demonstrates explicitly that the developed MLM-FEM coupled model is superior to the MLM model and more preferable for transient analysis of stator ground fault of generator. Simulation result with the MLM-FEM coupled model demonstrates good agreement with the experiment result, confirming the validity and effectiveness of the synchronous generator MLM-FEM coupled model proposed in the paper.