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Analysis of transient voltage stability based on a novel transient stability index

WANG Yi-hong,MEI Sheng-wei(State Key Lab of Power Systems,Dept.of Electrical Engineering,Tsinghua University,Beijing 100084,China)  
Based on the quadratic approximation of the stability region boundary,this paper proposes a transient voltage stability margin index,and analyzes the transient voltage stability of a one-machine and one-load system including an electromechanical transient model of induction motor.Simulations show that the proposed index has the advantages of high accuracy,high engineering practicability and facility of computer-implementing,and can be applied to obtain the margin of the transient voltage stability,estimate the critical clearing time of transient voltage stability and rank the severity of the contingencies.Simulations show that,for the system of this paper,the heavier load and larger static portion of mechanical torque in the load are more inclined to lead to transient voltage instability.
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