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From: prachi mat on 3 Nov 2009 02:26
hi
i have to design a h infinity controller for doubly fed induction generator for maximum power tracking
i have written the code for it but getting errors
the code is
clc
clear
ws=104;
wsl=0.2*ws;
p=3.14;
Ts=-1;
kl=1000;
wl=50;
wh=1000;
kh=10^-4;
%state space equations of plant model
b1=[1 0 0 0 ;0 1 0 0 ;-1600 0 0 0 ;0 -1600 0 0 ];
b2=[0 0;0 0;1647 0;0 1647];
c2=[1 0 0 0;0 1 0 0;0 0 1 0;0 0 0 1];
c1=[0 0 -1 0;0 0 0 -1];
d11=[0 0 1 0;0 0 0 1];
d12=[0 0;0 0];
d21=[0 0 0 0;0 0 0 0;0 0 0 0;0 0 0 0];
d22=[0 0;0 0;0 0;0 0];
a=[1.336 104.67 8.951e-3 0;-104.67 -1.336 0 8.95e-3;2140 (-167.7e3+(wsl)*1.6e3) 0 wsl;167.7e3 -wsl*1.6e3 2.14e3-wsl -24.38];
ss_g=mksys(a,b1,b2,c1,c2,d11,d12,d21,d22,Ts,'tss');
%second order weights
nw1=[0 kl*kl];
dw1=[1 2*wl wl*wl];
w1=tf(nw1,dw1)
nw2=[kh*kh 0 0];
dw2=[1 2*wh wh*wh];
w2=tf(nw2,dw2)
w3=[];
tssp=augtf(ss_g,w1,w2,w3);
[ssf,sscl]=hinf(tssp);
[acp,bcp,ccp,dcp]=branch(ssf);
[acl,bcl,ccl,dcl]=branch(sscl);
[np1,dp1]=ss2tf(acl,bcl,ccl,dcl)

the errors are
Error in ==> mkargs5x at 60
emsg='';

??? Output argument "nag1" (and maybe others) not assigned during call to "C:\Program
Files\MATLAB\R2008b\toolbox\robust\rctobsolete\robust\mkargs5x.m>mkargs5x".

Error in ==> augtf at 32
[emsg,nag1,xsflag,Ts,ag,bg,cg,dg,w1,w2,w3]=mkargs5x('ss,lti',varargin); error(emsg);

Error in ==> hinf1 at 30
tssp=augtf(ss_g,w1,w2,w3);


so please help me out
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