Difference between revisions of "OpenModelica-OpenIPSL/C2/Simulation-of-a-SMIB-using-OpenIPSL/English"

Learning Objectives

• How to simulate a controlled SMIB system
• Plotting voltage profiles of buses
• Plotting delta curve of the generator

System Requirements

• OpenModelica Version 1.12.0 and
• Linux OS 16.04

Also use the latest version of OpenIPSL to avoid compatibility issues. I am using OpenIPSL version 1.5.0.

The process demonstrated in this tutorial is identical to other OS such as-

• Windows
• Mac OS X or
• FOSSEE OS on ARM.

Prerequisites

• Power systems
• Modelling using OpenModelica

For relevant OpenModelica tutorials, please visit our website.

Prerequisites

• How to connect a controlled SMIB system

Also open the OpenIPSL library.

• For this, navigate to Generator tab.
• Open Generator parameter window.
• We can see that there are Initialisation data, Power flow data and Machine parameters.
• Refer to the additional material section for the values to be entered.
• I am entering the values here and initialising e1q.start and e2q.start as true values.
• For this, click on the checkbox which is to the left of the parameter.
• Then select “true:start-value is used to initialize”
• Now enter the rest of the parameters as shown.

In this case, we can see it is set to 100 MVA as system base and frequency as 50 Hz.

Here we can see there are 66 equations in the model and 66 variables for generator model.

And doing the same for Network model gives 142 equations and 142 variables.

From this we can say the models are solvable.

Click on the Simulation Setup icon at the top of the model.

This is to set up the solver and other parameters for the simulation.

The simulation time is set to 0 to 10 secs.

Make sure the "simulate" checkbox is checked before you click on "Ok".

Click on "Ok" which is at the bottom of the window and the simulation starts.

This shows the compilation and running status of the simulation.

After the simulation is successful, close the simulation output window.

On the right hand side, we can see all the components are listed in the Variables browser tab.

Now we can see all the variables under that particular component.

We can see all the parameters of the bus.

Now click on the checkbox which is on the left hand side of the voltage parameter (V).

Let me close the Messages browser for better view.

Here we can see the plot starts from 0 seconds and ends at 10 secs.

The voltage settles down after about 3.9 secs.

In this system, the steady state stability is achieved in less time after the fault is cleared.

This is due to the additional controls such as AVR and PSS used in the system.

We can see the settling time is reduced.

This is because of the fault impedance involved.

This is the drop caused by the impedance of the transmission lines.

This indicates whether the system is accelerating or stable.

Here we can see all the variables of generator.

It settles downs at 5.26 secs making the system stable.

Summary

In this tutorial, we have learnt:

• How to simulate a controlled SMIB system
• Plotting voltage profiles of buses
• Plotting delta curve of the generator

Assignment

• We recommend you to open the SMIB system which was modelled in earlier tutorial.
• Enter the required data, then simulate it.
• Then explore the results obtained.

Power System Simulation Project

For more details, please visit this website.

https://om.fossee.in/powersystems

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Acknowledgements

Thanks

Thank you for joining.