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《Proceedings of the CSEE》 2011-01
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Probabilistic Assessment of Transient Stability Based on Dynamic Security Region and Edgeworth Series

WANG Longjun,WANG Gang(College of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong Province,China)  
Probabilistic assessment of power system transient stability is a useful complement to determinate evaluation.The linear boundary of dynamic security region of the controlling unstable equilibrium point was determined on the basis of dynamical system theory.Then,Edgeworth series expansion based on semi-invariant was employed to calculate the weighted joint probability distribution.Consequently,power system transient stability probabilistic model was established.The model can effectively consider many uncertain factors,such as generator output and internal potential,load active power and reactive power,fault location,fault type,fault-clearing time,et al.The model and its solution do not require complicated formula derivation,and take advantage of clear physical meaning and high calculation efficiency.Finally,the numerical results of IEEE 10-machine 39-bus system demonstrate that the proposed model and its solution are effective and feasible and have broad prospects for engineering application.
【Fund】: 国家自然科学基金项目(50977032 50337010)~~
【CateGory Index】: TM712
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