基于前K最短路径的电力系统低频振荡源定位方法

Locating method of low frequency oscillation source based on K shortest paths

为了快速定位低频振荡源并及时采取相应措施抑制振荡的扩散,提出一种基于电力网络拓扑的振荡源定位方法。利用局部振荡及区间振荡模式下振荡源所在区域发出能量的特点,结合图论思想,在割集能量的基础上,提出最大振荡能量流割集的概念,将振荡源定位问题转化为最大振荡能量流割集的搜索问题。根据振荡能量流传播转移的特点,运用前K最短路径收缩搜索空间,利用往返替换算法找出所有割集,将振荡源所在范围限制在最大振荡能量流割集的内侧。利用蒙西电网进行仿真验证,结果表明,该方法能够快速有效地定位振荡源,且同时适用于局部及区间两种振荡模式,有一定的实用价值。

In order to locate the low frequency oscillation source quickly and take appropriate measures to suppress the oscillation, a locating method of low frequency oscillation source based on the power network topology is proposed. Energy production characteristics of the region of oscillation source under the local oscillation mode and inter-area oscillation mode are analyzed. Then, based on graph theory and cut-set oscillation energy, the concept of the cut-set of maximum oscillation energy flow is put forward. The oscillation source location is transformed into the search of the cut-set of maximum oscillation energy flow. According to the transmission characteristics of the oscillation energy flow, using K shortest paths to limit the search scope, and using travel replacing algorithm to find all cut-sets, then the oscillation source is limited to the inside of the cut-set of maximum oscillation energy flow. The West Inner Mongolia Power Grid is used to verify the correctness of the locating method, and the method is applicable to both local and inter-area oscillation mode. Therefore, this method has some practical value.