新型电励磁双凸极电机发电系统建模研究

A Novel Modeling Method for Power Generator Systems of Wound-excited Doubly Salient Machines

电励磁双凸极电机(wound-excited doubly salient machine,WEDSM)的精确建模是对其进行各项研究的基础,传统的WEDSM建模方法通过构造各相电枢绕组的电感或磁链模型以搭建WEDSM的总体模型,该方法虽计及电枢反应但忽略了励磁磁场的影响,所以不适用于WEDSM发电系统。该文首先研究一种新型的电枢绕组自感Lp和电枢绕组与励磁绕组间互感Lpf的非线性建模方法,该方法通过分析WEDSM自身的电感特性以及励磁磁场与电枢反应对电感的影响,拟合出同时计及励磁电流和电枢电流的影响系数,以建立Lp和Lpf的模型。同时本文基于励磁自感Lf的幅值在定转子对齐位置处只与励磁电流及该定子齿上的电枢电流有关的特性提出一种励磁绕组自感的精确非线性建模方法。在此基础上,该文建立发电系统模型,有限元仿真结果以及实验波形验证了模型的精确性。

An accurate model of wound-excited doubly salient machines （WEDSM） is the basis of the WEDSM research. The traditional modeling method establishes the WEDSM model by constructing the model of armature winding＇s inductances or flux linkage. This method is not applied to the power generator system of WEDSM although the armature reaction is taken into account but the effect of the excitation magnetic field is neglected. In this paper, a novel nonlinear modeling method of the self-inductance of the armature winding Lp and the mutual inductance between armature windings and the field winding Lpf was presented. This method, based on the analysis of the inductance characteristic of WEDSM and the influence of the excitation magnetic field and armature reaction on inductances, established a model of Lp and Zpf by fitting the influence coefficients where both the excitation current and the armature current are simultaneously taken into consideration. Furthermore, a new method used for establishing the self-inductance of the excitation winding Lf was proposed, which is based on the characteristic that Lf is determined by the armature current of the stator teeth under the same conditions of the excitation current when the rotor teeth are aligned with the stator teeth. On this basis, a model of power generator systems was established. A series of comparisons between the simulation results of the model, the simulation results of the finite element software and experiment were provided to verify the accuracy of this proposed WEDSM model.