How can I limit the PID controller output to a constraint of 0 to 1 for genetic algorithm?

My real system (buck converter) can only take an input of 0 to 1 (duty ratio) from the PID controller output for the circuit due to it simulating reality (can't have negative or above 1 duty ratio in reality).

How can I constrain the PID controller output so that the genetic algorithm only looks at a controller output of 0 to 1 instead of -inf to inf?

--------------------------------------Start of genetic algorithm------------------------------------

clear all, close all, clc

dt = 0.000001; % this is 10^-6

PopSize = 50 % was 500

MaxGenerations = 15; %was 1000

s = tf('s');

G = (1439928003.68621)/(s*s+5333.33333333333*s+95995200.2457475) % got this by doing feedback cmd

options = optimoptions(@ga,'PopulationSize',PopSize,'MaxGenerations',MaxGenerations,'OutputFcn',@myfun);

[x,fval] = ga(@(K)pidtest(G,dt,K),3,-eye(3),zeros(3,1),[],[],[],[],[],options);

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function J = pidtest(G,dt,parms)

s = tf('s');

K = parms(1)+ parms(2)/s + parms(3)*s/(1+0.000001*s)% this is 10^-6

Loop = series(K,G);

ClosedLoop = feedback(Loop,1);

t = 0:dt:0.05; % this indicates length of time to show

[y,t] = step(ClosedLoop,t);

CTRLtf = K/(1+K*G);

u = lsim(K,1-y,t); % line to potenially change for different TFs

Q = [1];

R = 0.00005; % 00000 change these to effect rise, overshoot, settling time?

J = dt*sum(Q*(1-y(:)).^2 + R*u(:).^2)

step(5*ClosedLoop,t)

h = findobj(gcf,'type','line');

set(h,'linewidth',2);

drawnow

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function [state, options,optchanged] = myfun(options,state,flag)

persistent history

persistent cost

optchanged = false;

switch flag

case 'init'

history(:,:,1) = state.Population;

cost(:,1) = state.Score;

case {'iter','interrupt'}

ss = size(history,3);

history(:,:,ss+1) = state.Population;

cost(:,ss+1) = state.Score;

case 'done'

ss = size(history,3);

history(:,:,ss+1) = state.Population;

cost(:,ss+1) = state.Score;

save history.mat history cost

end

--------------------------------------end of scripts---------------------------------------------------