基于暂态能量函数混合法的电力系统脆弱性分析

摘要

电力系统在遭受大干扰后失稳的后果非常严重，甚至是灾难性的，从暂态稳定方面分析系统的脆弱性具有重大的研究价值。采用暂态能量函数，结合暂态稳定分析中数值仿真法和直接法两种基本方法，同时考虑预想事故概率，从暂态稳定安全角度快速、定量评估电力系统的脆弱性。基于事故概率与暂态能量裕度构建相关脆弱度指标，并根据临界机群状态以修正暂态动能，改进不同事故下系统脆弱性的评估精度，同时确定系统的薄弱环节。通过对IEEE 5机14节点系统的仿真，验证了该方法的合理性与有效性。%losing stabilityThe consequences of power system by being subjected to large disturbance are very serious and even disastrous, so analyzing vulnerability of power system from the viewpoint of transient stability is extraordinarily valuable. This paper evaluates the vulnerability of power system from the viewpoint of transient stability safety quickly and quantitatively based on the transient energy function, combining the time simulation method and the direct method which are the two main methods of transient stability analysis, and at the same time considering the occurrence probability of contingency. It constructs correlative vulnerability index based on the probability of contingencies and transient energy margin, and revises transient kinetic energy based on the condition of critical cluster for improving the evaluation precision of vulnerability of power system under different contingencies and confirming the weak links of power system. Simulations of this method in IEEE 14-bus system demonstrate its rationality and effectiveness.