Abstract：Losing transient stability is an important aspect leading to a disastrous accident in a power system, so analysing power system vulnerability from the viewpoint of transient stability is indispensable. The vulnerability level of a system is often affected by weather condition, load demand level and random faults in the system, so these uncertain factors must be reasonably considered. In this paper, contingent faults’ probability models taking the weather factor into account are set up, and the idea of evaluating a power system’s vulnerability based on the system’s transient energy margin is proposed. In order to avoid a serious fault of smaller occurring probability is ignored, the idea of using both probability index and energy margin index to evaluate a system’s vulnerability is put forward. The formula to calculate the energy margin index of a fault is defined based on the transient energy function, which can reflect the influence of load demand change to the system's vulnerability. The weak components in the system can be found by means of energy margin indices relating to faults. Moreover, based on probability theory and Norm theory, the models to calculate compositive probability index and energy margin index of power system are derived. The models’ parameters are probability indices and energy margin indices of all possible faults in the system. Based on the models, an assessing algorithm for a power system vulnerability is proposed. By doing vulnerability analysis of an example power network, the feasibility and effectiveness of the above proposed models and assessing algorithm is proved.
卢锦玲, 朱永利. 基于暂态能量裕度的电力系统脆弱性评估[J]. 电工技术学报, 2010, 25(6): 96-103.
Lu Jinling, Zhu Yongli. Power System Vulnerability Assessment Based on Transient Energy Margin. Transactions of China Electrotechnical Society, 2010, 25(6): 96-103.
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2010, Vol. 25 
