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Home/Matlab/I am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller is very poorly than PI controller.

I am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller is very poorly than PI controller.

PuTI / 2025-05-07
I am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller is very poorly than PI controller.
Matlab News

I am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller generated a maximum of 1135 W PV power and a maximum of 7184 W DC load power instead of 20 kW power. The PV voltage has a maximum of 59 V against 847 V boosted voltage with 21 A maximum PV current against a maximum of 27 A inductor current. Below is the MPC script used in the Matlab function block:
function S = MPC_Boost(iL, V_PV, Vout, iL_ref, wf_min, wf_max, Dref)
% MPC controller for boost converter with iL_ref from MPPT logic

%% System Parameters
Ts = 10e-6;
RL = 0.02;
L = 0.0199;
C = 3.1222e-04;
R_load = 18;

%% Limits
iL_max = 20;
iL_min = 0.2;
Vout_max = 420;
Vout_min = 360;
P_PV_max = 20000;
Vout_ref = 400;

%% Persistent memory
persistent S_old wf;
if isempty(S_old)
S_old = Dref;
wf = wf_min;
end

%% Sanitize Inputs
iL = abs(iL);
Vout = abs(Vout);
V_PV = max(V_PV, 50);

%% Duty Cycle Candidates
states = [Dref – 0.05; Dref; Dref + 0.05];
states = min(max(states, 0.3), 0.9); % Clamp

%% Cost Evaluation
g = zeros(length(states),1);
g_min = inf;
n_best = 1;

X_k = [iL; Vout];

for n = 1:length(states)
D = states(n);

% Discrete model
A_d = [1 – (RL * Ts / L), -(1 – D) * (Ts / L);
(1 – D) * (Ts / C), 1 – (Ts / (R_load * C))];
B_d = [Ts / L; 0];

% Predict state
X_k1 = A_d * X_k + B_d * V_PV;
iboost_k1 = X_k1(1);
Vout_k1 = X_k1(2);
P_PV_pred = V_PV * iboost_k1;

% Constraint check
if iboost_k1 < iL_min || iboost_k1 > iL_max || …
Vout_k1 < Vout_min || Vout_k1 > Vout_max || …
P_PV_pred <= 0 || P_PV_pred > P_PV_max || …
isnan(iboost_k1) || isnan(Vout_k1)
g(n) = inf;
continue;
end

% Cost terms
g_iboost = (iL_ref – iboost_k1)^2;
g_vout = (Vout_ref – Vout_k1)^2;
g_sw = (D ~= S_old) * wf;
g_dref = (D – Dref)^2;
g_pv = (P_PV_pred < 100) * 1000;

% Total cost
g(n) = g_iboost + 0.1 * g_vout + g_sw + g_dref + g_pv;

if g(n) < g_min
g_min = g(n);
n_best = n;
end
end

%% Apply Selected Duty Cycle
S = states(n_best);
S = min(max(S, 0.3), 0.9); % Clamp again

% Adaptive penalty update
if S ~= S_old
wf = min(wf * 1.10, wf_max);
else
wf = max(wf * 0.90, wf_min);
end

S_old = S;
endI am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller generated a maximum of 1135 W PV power and a maximum of 7184 W DC load power instead of 20 kW power. The PV voltage has a maximum of 59 V against 847 V boosted voltage with 21 A maximum PV current against a maximum of 27 A inductor current. Below is the MPC script used in the Matlab function block:
function S = MPC_Boost(iL, V_PV, Vout, iL_ref, wf_min, wf_max, Dref)
% MPC controller for boost converter with iL_ref from MPPT logic

%% System Parameters
Ts = 10e-6;
RL = 0.02;
L = 0.0199;
C = 3.1222e-04;
R_load = 18;

%% Limits
iL_max = 20;
iL_min = 0.2;
Vout_max = 420;
Vout_min = 360;
P_PV_max = 20000;
Vout_ref = 400;

%% Persistent memory
persistent S_old wf;
if isempty(S_old)
S_old = Dref;
wf = wf_min;
end

%% Sanitize Inputs
iL = abs(iL);
Vout = abs(Vout);
V_PV = max(V_PV, 50);

%% Duty Cycle Candidates
states = [Dref – 0.05; Dref; Dref + 0.05];
states = min(max(states, 0.3), 0.9); % Clamp

%% Cost Evaluation
g = zeros(length(states),1);
g_min = inf;
n_best = 1;

X_k = [iL; Vout];

for n = 1:length(states)
D = states(n);

% Discrete model
A_d = [1 – (RL * Ts / L), -(1 – D) * (Ts / L);
(1 – D) * (Ts / C), 1 – (Ts / (R_load * C))];
B_d = [Ts / L; 0];

% Predict state
X_k1 = A_d * X_k + B_d * V_PV;
iboost_k1 = X_k1(1);
Vout_k1 = X_k1(2);
P_PV_pred = V_PV * iboost_k1;

% Constraint check
if iboost_k1 < iL_min || iboost_k1 > iL_max || …
Vout_k1 < Vout_min || Vout_k1 > Vout_max || …
P_PV_pred <= 0 || P_PV_pred > P_PV_max || …
isnan(iboost_k1) || isnan(Vout_k1)
g(n) = inf;
continue;
end

% Cost terms
g_iboost = (iL_ref – iboost_k1)^2;
g_vout = (Vout_ref – Vout_k1)^2;
g_sw = (D ~= S_old) * wf;
g_dref = (D – Dref)^2;
g_pv = (P_PV_pred < 100) * 1000;

% Total cost
g(n) = g_iboost + 0.1 * g_vout + g_sw + g_dref + g_pv;

if g(n) < g_min
g_min = g(n);
n_best = n;
end
end

%% Apply Selected Duty Cycle
S = states(n_best);
S = min(max(S, 0.3), 0.9); % Clamp again

% Adaptive penalty update
if S ~= S_old
wf = min(wf * 1.10, wf_max);
else
wf = max(wf * 0.90, wf_min);
end

S_old = S;
end I am trying to control a DC to DC boost converter using FSC MPC to generate a 20 kW PV power but the MPC controller generated a maximum of 1135 W PV power and a maximum of 7184 W DC load power instead of 20 kW power. The PV voltage has a maximum of 59 V against 847 V boosted voltage with 21 A maximum PV current against a maximum of 27 A inductor current. Below is the MPC script used in the Matlab function block:
function S = MPC_Boost(iL, V_PV, Vout, iL_ref, wf_min, wf_max, Dref)
% MPC controller for boost converter with iL_ref from MPPT logic

%% System Parameters
Ts = 10e-6;
RL = 0.02;
L = 0.0199;
C = 3.1222e-04;
R_load = 18;

%% Limits
iL_max = 20;
iL_min = 0.2;
Vout_max = 420;
Vout_min = 360;
P_PV_max = 20000;
Vout_ref = 400;

%% Persistent memory
persistent S_old wf;
if isempty(S_old)
S_old = Dref;
wf = wf_min;
end

%% Sanitize Inputs
iL = abs(iL);
Vout = abs(Vout);
V_PV = max(V_PV, 50);

%% Duty Cycle Candidates
states = [Dref – 0.05; Dref; Dref + 0.05];
states = min(max(states, 0.3), 0.9); % Clamp

%% Cost Evaluation
g = zeros(length(states),1);
g_min = inf;
n_best = 1;

X_k = [iL; Vout];

for n = 1:length(states)
D = states(n);

% Discrete model
A_d = [1 – (RL * Ts / L), -(1 – D) * (Ts / L);
(1 – D) * (Ts / C), 1 – (Ts / (R_load * C))];
B_d = [Ts / L; 0];

% Predict state
X_k1 = A_d * X_k + B_d * V_PV;
iboost_k1 = X_k1(1);
Vout_k1 = X_k1(2);
P_PV_pred = V_PV * iboost_k1;

% Constraint check
if iboost_k1 < iL_min || iboost_k1 > iL_max || …
Vout_k1 < Vout_min || Vout_k1 > Vout_max || …
P_PV_pred <= 0 || P_PV_pred > P_PV_max || …
isnan(iboost_k1) || isnan(Vout_k1)
g(n) = inf;
continue;
end

% Cost terms
g_iboost = (iL_ref – iboost_k1)^2;
g_vout = (Vout_ref – Vout_k1)^2;
g_sw = (D ~= S_old) * wf;
g_dref = (D – Dref)^2;
g_pv = (P_PV_pred < 100) * 1000;

% Total cost
g(n) = g_iboost + 0.1 * g_vout + g_sw + g_dref + g_pv;

if g(n) < g_min
g_min = g(n);
n_best = n;
end
end

%% Apply Selected Duty Cycle
S = states(n_best);
S = min(max(S, 0.3), 0.9); % Clamp again

% Adaptive penalty update
if S ~= S_old
wf = min(wf * 1.10, wf_max);
else
wf = max(wf * 0.90, wf_min);
end

S_old = S;
end mpc control of solar pv MATLAB Answers — New Questions

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Tags: matlab

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