时滞环节对电力系统小扰动稳定性的影响

Impact of Time Delay on Power System Small Signal Stability

简单回顾了含时滞环节的微分动力系统小扰动稳定性的研究方法;利用一单机-无穷大系统研究了时滞常数τ对系统小扰动稳定性的影响,研究发现时滞常数较大时,可能会完全改变电力系统小扰动稳定性的性态,如导致系统特征值出现较大偏差、改变其主导频率甚至主导特征值等。文中的研究工作,对于在电力系统稳定性分析和进行控制设备设计时合理考虑时滞环节影响具有一定的帮助。

Theory on dynamic system stability with time＂delay is briefly reviewed. A single＂machine infinite＂bus system is employed to analyze the impact of time＂delay on the system small signal stability. It is found that when the constant of time delay is big, the system small signal stability can be completely changed, such as the oscillation mode and the system key eigenvalues. Studies in this paper are helpful to appropriately consider the effect of time-delay in power system controller design and small signal stability studies.