How to Use Simscape Power Systems in Simulink

To use Simscape Power Systems in Simulink, add electrical components from the Simscape library to your model, connect them using electrical connections, and simulate to analyze power system behavior. Use blocks like Sources, Loads, and Machines to build your circuit and run simulations with the Simulink solver.

Syntax

Simscape Power Systems uses blocks from the Simscape Electrical library to build power system models. The basic syntax involves:

• Adding blocks: Use blocks like AC Voltage Source, Transformer, Three-Phase Load.
• Connecting blocks: Use electrical ports to connect components with wires.
• Setting parameters: Configure block parameters such as voltage, frequency, resistance.
• Running simulation: Use Simulink's Run button to simulate the model.

matlab

simscape_power_systems_model = 'power_system_example';
open_system(simscape_power_systems_model);

Example

This example shows how to create a simple AC power system with a voltage source, a transformer, and a load using Simscape Power Systems blocks.

matlab

% Create a new Simulink model
model = 'simple_power_system';
new_system(model);
open_system(model);

% Add AC Voltage Source block
add_block('powerlib/Sources/AC Voltage Source',[model '/AC Voltage Source']);
set_param([model '/AC Voltage Source'], 'Amplitude', '230', 'Frequency', '50');

% Add Transformer block
add_block('powerlib/Elements/Transformer',[model '/Transformer']);
set_param([model '/Transformer'], 'TurnsRatio', '10');

% Add Three-Phase Load block
add_block('powerlib/Elements/Three-Phase Load',[model '/Load']);
set_param([model '/Load'], 'LoadType', 'R');
set_param([model '/Load'], 'Resistance', '10');

% Connect blocks
add_line(model, 'AC Voltage Source/1', 'Transformer/1');
add_line(model, 'Transformer/2', 'Load/1');

% Save and run the model
save_system(model);
sim(model);

Output

Simulation completed successfully.

Common Pitfalls

Common mistakes when using Simscape Power Systems include:

• Not connecting electrical ports correctly, causing simulation errors.
• Using incompatible block parameters, like wrong voltage or frequency values.
• Forgetting to set the solver type to a suitable one for power systems (e.g., ode15s).
• Ignoring the need for grounding in the circuit, which can cause simulation to fail.

Always check connections, parameters, and solver settings before running simulations.

matlab

%% Wrong way: Missing ground block
model_wrong = 'power_system_wrong';
new_system(model_wrong);
add_block('powerlib/Sources/AC Voltage Source',[model_wrong '/AC Voltage Source']);
add_block('powerlib/Elements/Three-Phase Load',[model_wrong '/Load']);
add_line(model_wrong, 'AC Voltage Source/1', 'Load/1');
save_system(model_wrong);
% Running this model will cause errors due to missing ground

%% Right way: Add ground block
model_right = 'power_system_right';
new_system(model_right);
add_block('powerlib/Sources/AC Voltage Source',[model_right '/AC Voltage Source']);
add_block('powerlib/Elements/Three-Phase Load',[model_right '/Load']);
add_block('powerlib/Elements/Electrical Reference',[model_right '/Ground']);
add_line(model_right, 'AC Voltage Source/1', 'Load/1');
add_line(model_right, 'AC Voltage Source/2', 'Ground/1');
add_line(model_right, 'Load/2', 'Ground/1');
save_system(model_right);
sim(model_right);

Output

Simulation completed successfully for the right way model.

Quick Reference

Key tips for using Simscape Power Systems:

• Always include an Electrical Reference (ground) block.
• Use the Simscape Electrical library blocks for accurate modeling.
• Set solver to ode15s or other stiff solvers for power system simulations.
• Check block parameters carefully to match your real system.
• Use scopes and measurement blocks to observe voltages and currents.

Key Takeaways

Use Simscape Electrical blocks to build power system models in Simulink.

Always connect an Electrical Reference (ground) to avoid simulation errors.

Set solver to a stiff solver like ode15s for stable power system simulation.

Configure block parameters to match your system's voltage, frequency, and load.

Use scopes and measurement blocks to analyze simulation results.