Transient and Small Signal Stability Analysis

TRANSIENT AND SMALL SIGNAL STABILITY ANALYSIS

PROGRAM:

clear all

clc

E=1.2056;V=1.1;H=4.5;X=0.65;

pm=1.7;D=0.138;fo=50;

pmax=E*V/X

do=asin(pm/pmax)

ps=pmax*cos(do)

Wn=sqrt(pi*60/(H*ps))

Z=D/2*sqrt(pi*60/(H*ps))

Wd=Wn*sqrt(1-Z^2)

Fd=Wd/(2*pi)

Tau=1/(Z*Wn)

Th=acos(Z)

Ddo=10*pi/180

t=0:.01:3;

Dd=Ddo/sqrt(1-Z^2)*exp(-Z*Wn*t).*sin(Wd*t+Th);

d=(do+Dd)*180*pi;

DW=-Wn*Ddo/sqrt(1-Z^2)*exp(-Z*Wn*t).*sin(Wd*t);

f=fo+DW/(2*pi);

subplot(2,1,1),plot(t,d),grid

xlabel('tsec'),ylabel('delta deg')

subplot(2,1,2),plot(t,f),grid

xlabel('tsec'),ylabel('freqhz')

subplot(111)