isabellasmith01 asked . 2020-02-12

How can I solve this MATLAB â€œError using + Matrix dimensions must agree.â€ ?

%Fundamental voltage of the grid IN v1

Vone=690;

%Variable Frequency IN HZ

w=[0.1: 0.1: 1000];

% Angular Frequency IN HZ

omegadot=2*pi*w;

%Rated Frequency f1 IN HZ

omega1=2*pi*60;

%Stator Turns

Ns=1;

%Stator Leakage Inductance IN HENRY

Ls=84.1*10e-6;

%Stator Resistance IN OHM

Rs=7.9*10e-3;

%Magnetizing Inductance IN HENRY

Lm=1.7*10e-3;

%Rotor Speed IN RPM

N=1080;

%RSC Decoupling Gain

Krd=0.00245;

% Transfer funnction signal

s=1i.*omegadot;

%RSC Proportional Gain

Krp=0.052;

%SSC Proportional Gain

Ksp=1.21;

%PLL Proportional Gain

Kpp=44.43;

%DC bus Proportional Gain

Kvp=0.0296;

%Rated Power IN VA

P=3*10e6;

%DC Voltage IN VOLTS

Vdc=1500;

%Rotor Turns

Nr=0.33;

%Rotor Resistance IN OHM

Rr=0.86*10e-3;

%Rotor Leakage Inducatance IN HENRY

Lr=9.21*10e-6;

%SSC Filter Inductance IN HENRY

Lp=63*10e-6;

%Pole Pairs

p=3;

%RSC Decoupling Gain

Ksd=0.025;

%RSC Integral Gain

Kri=0.027;

%SSC Integral Gain

Ksi=2820;

%PLL Integral Gain

Kpi=2791;

%DC Bus Integral Gain

Kvi=1.861;

% Reflected leakage inductance

Lsr=Ls+(Ns.^2/Nr.^2)*Lr;

% Reflected Resistance

R1r=(Ns.^2/Nr.^2)*Rr;

% sys signal function

g=s-1i*60

% Perturbation of Positive Sequ

Pp_s=(s-(1i).*1080)./s;

% Current Compensator function RSC current controller Hri_g

Hri_g=Krp+Kri./g;

% Current Compensator function for phase locked loop Hpll

Hpll_g=Kpp+(Kpi./g)./g;

% phase locked loop Tpll

Tpll_g=-1i.*(Kpp+(Kpi./g))./g/1+(Kpp+(Kpi./g)./g);

%Fundamental voltage of the grid IN v1

Vone=690;

%Rotor Resistance IN OHM

Rr=0.86*10e-3;

% Rotor Current IN AMP

Ir1=Vone./Rr;

% Fundamental voltage of the RSC Terminal in Volts

Vcr=690+Ir1*((1i*60)*(Lsr)+Rs+((R1r)./1i*60));

%positive sequence impedance

H_s=((s.*Lsr+Rs+(R1r./Pp_s))+(Ns^2./Nr^2).*(Hri_g-1i.*Krd)./Pp_s)/(1-(Tpll_g./2).*(Ir1./690).*(Ns.^2/Nr.^2).*(Hri_g-1i.*Krd./Pp_s+(Vcr./690)));

w=[0.1: 0.1: 10^2];

omegadot=2*pi*w;

s=1i.*omegadot;

H_s=((s.*Lsr+Rs+R1r./Pp_s)+(0.8911*((Hri_g)-(1i.*Krd))./Pp_s))/(1-(Tpll_g./2).*(Ir1./690).*(Ns.^2/Nr.^2).*(Hri_g-1i.*Krd./Pp_s+(Vcr./690)));

matlab

Expert Answer

Kshitij Singh answered . 2025-01-26 10:52:05

The "Error using + Matrix dimensions must agree" in MATLAB occurs when you try to perform an operation on matrices (or arrays) that have incompatible sizes. Here are some steps to help you resolve this issue:

Check Matrix Dimensions: Ensure that the matrices you are trying to add have the same dimensions. For example, if you have two matrices A and B, they should both be either 2x2, 3x3, etc.
Element-wise Operations: If you want to perform element-wise operations, use the dot operator (.). For example, use A .* B instead of A + B.
Reshape or Resize: If the matrices have different sizes, you might need to reshape or resize one of them to match the other. You can use functions like reshape, resize, or permute to adjust the dimensions.
Use Compatible Functions: Some functions in MATLAB automatically handle operations on matrices of different sizes. For example, sum, mean, and dot can handle operations on arrays of different sizes.

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