电力系统中机电扰动的传播特性分析

Characteristic Analysis of Electromechanical Disturbance Propagation for Power System

研究机电扰动在均匀离散的链式电力系统中的传播规律。通过Laplace和Z联合变换,用Bessel函数表示出机电扰动在均匀离散系统中的变化特征,得出扰动的增衰规律与连续体模型中机电波的增衰规律完全相同,而且离散系统中扰动传播到每一条母线所需要的时间与连续体模型中机电波传播到相应母线所需时间也完全相等。最后用一个由64台发电机组成的环形离散仿真系统,证实用离散模型和连续体模型描述电力系统中机电扰动传播的合理性和正确性。

It is presented that the laws of electromechanical disturbance propagation in a discrete uniform chain power system. Through the Laplace and Z transformations, it represents the varying features of electromechanical disturbance in a uniform chain network using the family of Bessel functions; the growing or attenuating laws are the same as that of electromechanical wave in a continuum model along the corresponding transmission media. Furthermore, the time of electromechanical disturbance arriving at any bus in the discrete model is also the same as that of electromechanical wave arriving at the corresponding bus in the continuum model. Finally, the simulation based on a 64 generators ring system validates the rationality and correctness of both the discrete and continuum models describing electromechanical disturbance propagation in the power systems.