3/3相双绕组发电机系统的等效电路模型

EQUIVALENT CIRCUIT MODEL OF 3/3-PHASE DOUBLE WINDING GENERATOR WITH SIMULTANEOUS AC AND RECTIFIED DC LOAD

整流桥的存在使3/3相双绕组发电机系统成为非线性系统,发电机始终处于非对称运行状态。为了对此进行解析分析,将3/3相双绕组发电机的d、q轴变量分解为低频分量和高频分量分别加以处理,忽略转子回路电阻对高频电流和阻尼绕组对低频分量的作用,在d、q轴超瞬变电抗近似相等的条件下,分别建立了3/3相双绕组发电机系统从整流绕组侧和交流绕组侧观察的等效电路模型。给出了模型中 等效发电机的Park方程、稳态运行矢量图及相应稳态量的计算方法。该模型可用于系统稳态和似稳态过程的分析计算。

The 3/3-phase double winding generator system is a nonlinear system because of the rectifier bridge, and the generator always works in asymmetric state. In order to do analytic study of the system, the d- and q- axis variables of 3/3-phase double winding generator are resolved into low-frequency and high-frequency components, which can be treated separately. The effects of the resistances of rotor circuits on high-frequency currents and the damper winding on low-frequency components need not be taken into account. Considering that the d-axis sub-transient reactance is approximately equal to q-axis sub-transient reactance, two equivalent circuit models of 3/3-phase double winding generator, which are observed from AC winding and DC winding respectively, are developed. The Parks equations, phasor diagram and the method of performance calculations for steady-state operation of the equivalent generators in two models are presented. The models can be used for steady-state and quasi-steady-state analysis of the system.