电力系统电压安全灵敏度的分析方法研究

Study on Analysis Approach for Sensitivity of Voltage Security in Power System

针对目前的电力系统薄弱节点识别方法普遍存在难以适应互联大电网电压稳定计算和分析的问题,提出一种基于当前状态下的电压安全灵敏度分析方法。利用雅可比矩阵数学模型建立了评价节点薄弱程度的指标,对补偿前后的节点系统电压偏移量进行比较分析,依据薄弱节点的排序来确定系统的无功补偿方案。以IEEE14节点系统为例进行电压安全灵敏度计算分析,结果表明,所提出的薄弱节点指标能有效提取系统的薄弱节点,在薄弱节点进行无功补偿时系统电压幅值提高最大。

Aiming at recognition method for weak buses in power system can scarcely be used for calculation and analysis of voltage stability,the paper proposes an analysis approach for sensitivity of voltage security on the basis of current status.Mathematic model of Jacobian matrix is employed to establish index for assessment of bus weakness,voltage offsets before and after the compensation are comparatively analyzed and reactive compensation scheme in accordance to sequence of weak buses is made.IEEE 14 node system is taken as an example for calculation analysis and the result shows that the index of weak bus can pick up the weak buses and system voltage amplitude is unprecedentedly raised during reactive compensation at weak buses.