机网暂态过程数值仿真中的同步电机模型

DIGITAL SIMULATIONS OF SYNCHRONOUS MACHINES IN MACHINE NETWORK TRANSIENT ANALYSIS

提出了一种新的适用于电力系统机网暂态过程数值仿真的无阻尼绕组同步电机模型,通过采用“先求通解,再用梯形法求积”的方法对同步电机的电压方程组进行差分化,成功地消除了因旋转电势引起的、存在于同步电机直轴电压方程和交轴电压方程之间的耦合,导出了相互解耦的直轴和交轴瞬态等值电路。通过算例比较了该模型与EMTP模型的仿真结果,证明这种新模型是正确的,其仿真算法比EMTP算法更精确。

This paper presents a novel model of synchronous machines for the transient analysis of power systems. Through a special method, the differential voltage equations of a synchronous machine, which are coupled in d\|axis component and q\|axis component, are decomposed into de\|coupled equations while the synchronous machine is described by its de\|coupled d\|axis equivalent circuit and q\|axis equivalent circuit. The model is more accurate than EMTP's model and very convenient for practical use. An example is given to illustrate the accuracy and stability of this model.