摘要
通过对大规模电网的失步仿真研究发现,当系统失步时失步机群可能会呈现为主要失步机群和次要失步机群2种失步模式。主要失步机群决定着整个大区电网的失步中心断面联络线,而次要失步机群不能决定整个大区电网的失步中心断面联络线。该现象将导致通过捕捉失步断面电压最低点(失步中心)寻找失步断面联络线的方法一般只能将主要失步机群分开,却未必能够将次要失步机群也合理分布到与之同调的机群之中。因此,工程中应结合系统离线仿真分析,尽可能对有可能成为次要失步模式的机组安装失步解列装置,以作为一种后备,防止次要失步模式机组扰动系统,造成事故扩大。
Through the simulation analysis of large-scale power system, it is found that the out-of-step generators may behave in two groups, the main out-of-step generator groups and the minor out-of-step generator groups. The main out-of-step generator groups can determine the out-of-step center interface tie-lines of large-scale power system, but the minor out-of-step generator groups cannot. This phenomenon facilitates a method of capturing the out-of-step center interface tie-lines, based on searching the lowest voltage points （center of out-of-step） during the system out-of-step state. By doing so, the main out-of-step generator groups can be identified. But the method maybe fails to split the minor out-of-step generators into the correct coherent out-of-step generator groups. Hence, in engineering practice, the generators which are likely to be in the minor ou-of- step groups should be equipped with the out-of-step separation equipment based on the off-line system analysis. Thus with the backup of the separation devices, further accident will be avoided.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第17期50-53,107,共5页
Automation of Electric Power Systems
关键词
失步解列
失步中心
失步断面
主要失步机群
次要失步机群
system separation
center of out-of-step
out-of-step interface
main out-of-step generations
minor out-of-step generations
