Genetic Algorithm using ga command is giving solutions out of defined bounds.

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I am using ga command to find optimal values for a pd controller for a plant. I have defined the contraints an dthe lower and upper bounds, however each time it is giving me negative solutions for Kd(Second parameter of PD controller). Kindly help.
clear all, close all, clc
dt = 0.001;
PopSize = 25;
MaxGenerations = 10;
s = tf('s');
G = 1/ (s^2 + 2.813*s + 1.768);
lb=1;
ub=100;
options = optimoptions(@ga,'PopulationSize',PopSize,'MaxGenerations',MaxGenerations);
[x,fval] = ga(@(K)pidtest1(G,dt,K),2,-eye(2),zeros(2,1),[],[],lb,ub,[],options);

采纳的回答

Matt J
Matt J 2022-3-4
[x,fval] = ga(@(K)pidtest1(G,dt,K),2,[],[],[],[],[1,1],[100,100],[],options);

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