使用等值导纳进行电力系统小世界特性识别

Small-world Feature Identification Based on Equivalent Admittance for Power System

提出基于等值导纳的电力系统小世界特性识别新指标。针对已有小世界模型大多基于最短路径假设,与电力系统实际不甚相符的问题,根据潮流"可分性"假设,采用戴维宁等值阻抗作为节点间距离的度量,将系统的全局和局部等效导纳作为识别小世界特性的新指标,并给出具体实现流程。与已有指标相比,该指标物理背景更符合电力系统实际,且实现算法具有多项式的时间复杂度,更适用于大规模系统分析。具体算例表明所提指标在电力系统小世界特性识别方面和已有模型同样有效,且可以解决某些已有模型不能正确解释的问题。对西北电网的分析表明了所提指标在实际应用中的有效性。

New indices of small-world feature identification based on equivalent admittance for power system were presented with detailed implementation. Compared with the shortest path used in existed models, it is reasoned that the Thevenin＇s equivalent impedance can be used as measurement of,the distance between different buses according to partibility hypothesis of power flow. Global and local equivalent admittance were presented as indices to identify the small- world feature of power system with more comprehensible physical view and polynomial time complexity, which is simple to be implemented and more suitable for large-scale power system. Numeric examples show that the presented indices have the same effect as existed models while are more flexible for some situations in which the existed ones can not work properly. Analysis of Northwest China Power Grid shows that the presented indices are valid in practice.