【摘要】 多运行方式下的系统特征根将以一定的概率分布在某些区间内。正态假定下的均值、方差可用来描述这种分布特性。当使用电力系统稳定器（ＰＳＳ）改善系统阻尼时，主要应考虑ＰＳＳ对临界特征根的均值、方差的影响。文中将传统的特征根灵敏度分析方法扩展为对特征根均值的灵敏度和方差的灵敏度。由此进行的ＰＳＳ选址和参数设计，将使ＰＳＳ具有多运行方式下的整体合理性。更多还原

【Abstract】 Probabilistic analysis efficiently provides a statistical approach of system eigenvalues in case of multi-operating conditions on power system dynamic studies. Under normal distribution, each eigenvalue can be described by its mean and variance. To enhance system damping under multi-operating conditions by power system stabilizers (PSSs). effects of PSSs on both eigenvalue mean and variance should be investigated. In this paper, the conventional eigenvalue sensitivity analysis has been extended to sensitivities to both means and variances of eigenvalues. The designed PSS parameters will be suitable for a wider range of power system operation.更多还原