基于新型发电机定子暂态模型的过电压计算

Over-voltage Calculation Based on a Novel Generator Stator Transient Model

发电机定子绕组中侵入过电压可通过定子绕组电路模型分析计算。但传统的定子绕组电路模型与实际工况不符,存在误差。文中提出的定子绕组有源模型,考虑了定子绕组切割磁感线产生的电动势,将其按不同相角计入定子槽内,并将各定子槽内电动势细分为电动势单元引入定子绕组模型中。新型定子绕组模型符合实际电机运行情况,电压仿真说明了利用此模型较传统模型进行电路计算精度更高。

The over-voltage inrush into generator stator windings can be calculated using the stator winding equivalent circuit model. But the traditional stator model cannot accurately represent the stator’s electromotive force in realistic working conditions. An active stator winding model is presented by considering the electromotive force resulted from the relative movement of the stator winding with respect to the magnetic fields. Every stator slot will produce electromotive force with different phase angles, while putting the electromotive force into every sub-bar of the winding model and subdividing it. The novel stator winding model reflects the true electrical characteristics of the stator winding. The over-voltage simulation result shows that the novel model has high accuracy in calculating stator transient process.