交直流输电系统低频振荡仿真分析

摘要

以单机无穷大系统为例对弱阻尼振荡和强迫振荡机理的异同进行了分析；以具有交直流并行联络线的四机两区域系统为模型,采用特征值分析法和时域仿真方法,利用BAP和PSCAD/EMTDC仿真软件对低频振荡现象进行了研究；仿真分析了高压直流输电的接人对系统阻尼的影响以及强迫振荡的影响因素,比较了两种振荡现象的异同.研究结果对低频振荡的分析、监测和控制有一定指导作用.%Differences between the weak damping oscillation and forced oscillation mechanism were analyzed with single machine infinite bus power system in the paper. Using the two-area system with paralleled DC and AC lines as the simulation model,oscillation phenomena were simulated and analyzed by eigenvalue analysis and time domain simulation methods in BPA and PSCAD/EMTDC; And the effect of access of HVDC transmission to the power system damping and effect factors to forced oscillation were also analyzed. Besides, the differences of the two Oscillation phenomena were compared. The results of the study have definite instructive meaning for the analysis, monitor and control of low frequency oscillation.