scholarly journals Saddle Node Bifurcation and Voltage Stability Analysis of Sri Lanka

2012 ◽  
Vol 45 (4) ◽  
pp. 23
Author(s):  
Dinesh Rangana Gurusinghe
Keyword(s):  
Stability Analysis ◽  
Sri Lanka ◽  
Voltage Stability ◽  
Saddle Node Bifurcation ◽  
Saddle Node

A New Method for Static Voltage Stability Assessment based on The Local Loadability Boundary

2012 ◽  
Vol 13 (4) ◽  
Author(s):  
Thang Van Nguyen ◽  
Y. Minh Nguyen ◽  
Yong Tae Yoon
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
Direct Method ◽  
Electric Power System ◽  
New Method ◽  
Stability Assessment ◽  
Saddle Node Bifurcation ◽  
Static Voltage Stability ◽  
Saddle Node ◽  
Thevenin Equivalent

Abstract This paper proposes a new method for assessing static voltage stability based on the local loadability boundary or P- Q curve in two dimensional power parameter space. The proposed method includes three main steps. The first step is to determine the critical buses and the second step is building the local loadability boundary or the saddle node bifurcation set for those critical buses. The final step is assessing the static voltage stability through the distance from current operating point to the boundary. The critical buses are defined through the right eigenvector by direct method. The boundary obtained by the proposed method that is combining a variation of standard direct method and Thevenin equivalent model of electric power system is a quadratic curve. And finally the distance is computed through the Euclid norm of normal vector of the boundary at the closest saddle node bifurcation point. The advantage of the proposed method is that it keeps the advantages of both efficient methods, the accuracy of the direct method and simple of Thevenin Equivalent based method. Thus, the proposed method holds some promise in terms of performing the real time voltage stability assessment of power system. Test results of New England 39 bus system are presented to show the effectiveness of the proposed method.

scholarly journals Control of a saddle node bifurcation in a power system using a PID controller

2003 ◽  
Vol 1 (01) ◽  
Author(s):  
D. Rosas ◽  
C. Amaro ◽  
J. Alvarez
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Pid Controller ◽  
Voltage Collapse ◽  
Saddle Node Bifurcation ◽  
Saddle Node ◽  
Rotor Angle ◽  
Basic Power

In this work, we present the elimination of a saddle-node bifurcation in a basic power system using a PID controller. In addition, a stability analysis of the rotor angle and its frequency, which are directly related to voltage collapse problem, is presented.

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