create losses block in inverter in matlab

To create losses block in an inverter in MATLAB, we need to model the various types of losses that are encountered in power electronic components. In a typical inverter, the major sources of losses are:

• Switching losses
• Conduction losses

Switching losses are caused by the switching of the inverter's switches, which leads to dissipation of energy in the form of heat. Conduction losses are caused by the current flow through the components, which also leads to dissipation of energy in the form of heat.

The losses block can be created in Simulink, a graphical programming environment for modeling, simulating, and analyzing multi-domain dynamic systems. In Simulink, we can use the MOSFET and IGBT blocks to model the switching components, and the resistance and the diode blocks to model the conduction components.

Here is a code snippet that illustrates how to create a losses block in an inverter in MATLAB:

main.m
% Define inverter parameters
Vdc = 48;           % DC input voltage
fsw = 20e3;         % Switching frequency
Rload = 10;         % Load resistance
Cdc = 100e-6;       % DC-link capacitor

% Switching losses
Vsw = Vdc/2;
Qsw = (Vsw^2)/(2*Rload*fsw);
Losses_Sw = Qsw*fsw;

% Conduction losses
Iload = Vdc/(2*Rload);
Vfwd = 0.7;         % Forward voltage drop of diode
Losses_D = (Iload^2)*Rload + (Iload^2)*Vfwd;

% Total losses
Losses_Total = Losses_Sw + Losses_D;

% Create losses block
Losses_Block = Simulink.Block.create('SubSystem');
Losses_Block.addBlock('simulink/Math','Switching Losses','Expression','Losses_Sw');
Losses_Block.addBlock('simulink/Math','Conduction Losses','Expression','Losses_D');
Losses_Block.addBlock('simulink/Math','Total Losses','Expression','Losses_Total');
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In this code, we first define the parameters for the inverter such as the input voltage, switching frequency, load resistance, and DC-link capacitor. We then calculate the switching and conduction losses using the equations for the losses. Next, we calculate the total losses by adding the switching and conduction losses. Finally, we create the losses block using the Simulink.Block.create function and add the various blocks for the switching losses, conduction losses, and total losses.