Three phase Variable load for 24 h

Hi, I wanted to design an simulink a three phase variable load. I wanted to use signal builder/editor but I'm struggling when I use it with Three phase serial or parallel load.Can Someone guide me on this.

Answer 1

[Maneet Kaur Bagga]

Hi Jack,

As per my understanding you want to design a "three-phase" variable load in Simulink using the Signal Builder/Editor Block. As per the MathWorks Documentation the "Signal Builder" block is outdated, and we can do the design using a "Signal Editor" block. Please refer to the steps below for the implementation:

• Setting Up the Three-Phase Load Model: Place a "Three-Phase" Source block in the blank Simulink model. Use "RLC branches" for the load (available in Simscape>Electrical>Specialized Power Systems>Passives) and configure these elements to represent the desired load in either series or parallel.
• Use the Signal Editor for Variable Load Control: Add a "Signal Editor" block to the model. Open the GUI of the block by double clicking on it and define the signal that represent the different load conditions over time for the variable load along with the signal properties.
• Connecting signal to Control Load Parameters: To dynamically control your load parameters with the signals from the Signal Editor, use blocks like "Gain" to adjust the signal properties. Run the simulation after setting the Simulation parameters and use the visualization block like "Scope" to observe the three-phase load under variable conditions.

Please refer to the MathWorks Documentation for further understanding of the blocks:

Signal Editor: https://in.mathworks.com/help/simulink/slref/signaleditorblock.html

Scope Block: https://in.mathworks.com/help/simulink/ug/simulation-data-display-and-capture-using-scopes.html

Hope this helps!

[Jack Lethy]

Dear Maneet, thanks for your quick response and assistance.

Step 1 to 2 i'm doing without problème,

• set RLC load and select P or Q value.
• Signal editor, i'm doing separatly also, and set value import from my excel file.

The issue is on step 3, how to connect signal builder to control the load, i'm not seeing any port for that after many check.

Can you if possible show me by sharing a small sketch for me.

[Jack Lethy]

Below the illustation

[Maneet Kaur Bagga]

Hi Jack,

The steps for establishing the connections are:

• Three-Phase Source directly connected to the RLC Load.
• Signal Editor outputs are not connected directly to the RLC Load but to a Controlled Source (Voltage / Current).
• The Controlled Voltage or Current Source is then used to inject voltage or current into the circuit, influenced by the Signal Editor outputs.
• The Controlled Source is connected in series or parallel with the RLC Load to affect its perceived power consumption (P or Q).

Hope this helps!

[Jack Lethy]

Dear Maneet, thanks. I've tryied but not still seeing the port for connecting. Thanks for your assistance

[Maneet Kaur Bagga]

Hi Jack,

You can refer to the below model or type "power_3phseriescomp" in the MATLAB Command line for better understanding.

[Jack Lethy]

Ok thanks

[Jack Lethy]

Thanks alot. The issue is there is no variable load on the model.

If you can help me on drawing the controlled source, connected with the RLC parrallel load with signal editor it will be very helpful for me.

Sorry if i ask to much