# Voltage stability index code

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weldon on 10 Jan 2018
Answered: Aneel Kumar on 6 Jan 2023 at 3:45
Hi, I am doing a project which require calculation of fast voltage stability index(FVSI). Please assist on how to come up with matlab code to calculate this index in power system
Amulya Goyal on 8 Sep 2022

pranay dattani on 7 Mar 2021
i try to calculate the Line Stability Index, voltage Stability Index, linr stability factor
clc; clear all; close all; format compact;
Vs=0.9526+j*0.55; % Sending End Voltage in pu
Vsm=abs(Vs); % Magnitude of Sending End Voltage
Vsa=angle(Vs); % Angle of Sending End Voltage
Vr=1.00+j*0; % Receiving End Voltage in pu
Vrm=abs(Vr); % Magnitude of Receiving End Voltage
Vra=angle(Vr); % Angle of Receiving End Voltage
Delta=Vsa-Vra;
R=0.1; % Line Resistance
X=1; % Line Reactance
Z=R+j*X; % Line Impedance
Zm=abs(Z);
Theta=angle(Z);
Pr=1.2; % Receiving End Active Power
Qr=0.5; % Receiving End Reactive Power
Sr=Pr+j*Qr; % Receiving End Apprant Power
fprintf('Line Stability Index \n')
Lmn=(4*X*Qr)/((Vsm*sin(Theta-Delta))^2) % Line Stability Index
fprintf('Fast Voltage Stability Index \n')
FVSI=(4*(Zm^2)*Qr)/((Vsm^2)*X) % Fast Voltage Stability Index
fprintf('Line Stability Factor \n')
LQP=4*(X/(Vsm^2))*(Qr+(((Pr^2)*X)/(Vsm^2))) % Line Stability Factor
% Line is assumed to be lossless. So,Here the sending end power is equal
% To Reaceiving End Power
##### 2 CommentsShowHide 1 older comment
oukennou aziz on 18 Nov 2022
You can put them in the vector

Aneel Kumar on 6 Jan 2023 at 3:45
How to calculate voltage deviation of any standard IEEE Bus system by Matlab coding

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