phasor.m

来自「市面上电力系统的范例 直得收藏学习的ㄧ本书」· M 代码 · 共 36 行

% This function produces a plot for the phasors F. The phasors can be expressed
% in a one column array in rectangular complex form or in a two column array in
% polar form, with 1st column magnitude and 2nd column phase angle in degree.

%  Copyright  (c) 1998 H. Saadat

function phasor(F)
rankF=length(F(1,:));
if rankF == 2
mag = F(:,1);  th = F(:,2)*pi/180;
Vr=mag.*cos(th);
Vi=mag.*sin(th);
elseif rankF == 1
mag=abs(F); th = angle(F);
Vr = real(F); Vi = imag(F);
else
fprintf('\n  Phasors must be expressed in a one column array in rectangular complex form \n')
fprintf('  or in a two column array in polar form, with 1st column magnitude & 2nd column \n')
fprintf('  phase angle in degree. \n')
return, end
Vscle=1.2*max([abs(Vr); abs(Vi)]);
Z=1.1547005*mag/10;
x1= Vr-(Z.*sin(pi/3-th));
y1= Vi-(Z.*cos(pi/3-th));
x2= Vr-(Z.*cos(th-pi/6));
y2= Vi-(Z.*sin(th-pi/6));
or=zeros(length(F(:,1)),1);
Vx=[or  Vr]; Vy=[or  Vi];
Ar1x=[x1  Vr]; Ar1y=[y1  Vi];
Ar2x=[x2  Vr]; Ar2y=[y2  Vi];
Arx=[Ar1x;Ar2x]; Ary=[Ar1y; Ar2y];
h=plot(Vx', Vy', Arx', Ary');
axis([-Vscle Vscle -Vscle Vscle])
axis('square'), axis('equal')
set(h,'color', [1, 0,0]);