View source for OpenModelica-OpenIPSL/C2/Demonstration-of-a-model/English

Title of the script: Demonstration of a model in OpenIPSL''' '''

'''Keywords''': SMIB, single machine infinite bus, openmodelica, omedit, openipsl, power systems, spoken tutorial, video tutorial

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|'''Visual Cue'''
|'''Narration'''
|-
|| '''Slide Number 1Title Slide'''
|| Welcome to this Spoken Tutorial on '''Demonstration of a model '''in '''OpenIPSL.'''
|- 
|| '''Slide Number 2'''

'''Learning Objectives'''
|| In this tutorial, we will learn:
* About '''SMIB'''
* Set up the initial values and '''power flow data'''
* '''Compile''' a '''model'''
* '''Simulation''' and its setup and
* Interpreting the results obtained

|- 
|| '''Slide Number 3'''

'''System Requirements'''
|| To record this tutorial, I am using
* '''OpenModelica version 1.12.0''' and
* '''Ubuntu Linux OS 16.04'''

Also, use latest version of OpenIPSL to avoid compatibility issues

I am using OpenIPSL version 1.5.0

The process demonstrated in this tutorial is identical in other OS also such as-
* '''Windows'''
* '''Mac OS X''' or 
* '''FOSSEE OS''' on '''ARM'''.


|- 
|| '''Slide Number 4'''

'''Prerequisites'''
|| To follow this tutorial, you should have knowledge of :

* '''Power systems''' and
* '''Modelling''' using '''OpenModelica'''





For prerequisite '''OpenModelica''' tutorials, please visit this website. 
|- 
|| '''Slide Number 5'''

'''What is SMIB?'''
|| First, let’s see what is''' SMIB'''. 
* '''SMIB '''stands for '''Single Machine Infinite Bus.'''
* In this '''network''', there is only a single '''machine''' and an infinite '''bus''' (as the name suggests).
* The synchronous '''machine''' is connected to the '''Infinite bus''' using '''power lines'''.


|- 
|| 


Show the folder on your '''Desktop'''.
|| 

Download the files given in '''Code Files''' link of this tutorial.

And extract them into a separate folder.

Now, let us open the '''SMIB model''' in '''OpenModelica'''.
|- 
|| Cursor to '''OMEdit '''window.
|| Open '''OMEdit '''window.

I have already opened OpenModelica on my system.
|- 
|| 
|| First, we have to include the '''OpenIPSL library'''.
|- 
|| '''File >> System Libraries >> OpenIPSL'''
|| To do this, go to '''File >> System Libraries >> OpenIPSL.'''

Let me resize the libraries browser window for better view.
|- 
|| Point to '''Libraries Browser.'''
|| The''' OpenIPSL package''' opens in the '''Libraries Browser.'''
|- 
|| 
|| Now let us open the '''SMIB model'''.
|- 
|| '''File''' >> '''Open Model/Library File.'''

|| Go to '''File''' menu and click on '''Open Model/Library File.'''
|- 
|| Select '''Desktop'''
|| Select the folder where the '''model''' is saved.
|- 
|| Click on '''SMIB_model.mo''' file.
|| Double-click on '''SMIB_model.mo''' file.
|- 
|| Cursor to '''Libraries Browser.'''
|| '''SMIB_model '''opens in '''Libraries Browser.'''
|- 
|| Double click on '''SMIB_model '''file
|| Now double-click on '''SMIB_model '''file.

Let me close the libraries browser and messages browser for better view.
|- 
|| Point to '''Diagram View'''
|| The file opens in the '''Diagram View'''.

Let me zoom in for better view.

For this I am pressing ‘Ctrl’ and ‘+’ sign simultaneously. 
|- 
|| 

Point to all the components in the model. 
|| Here we can see that, this '''model''' consists of the following components:


* '''A generator of order 6 (with no controls(Constant Efd))'''
* '''Three Buses'''
* '''Two winding Transformer'''
* '''Two power lines'''
* '''An infinite bus'''
* '''Three phase balanced fault block'''
|- 
|| Cursor to the''' generator''' and '''Bus 1'''
|| The''' generator''' is connected to '''Bus 1'''.

This '''generator''' has no '''controls''' but the '''field voltage (Efd)''' is maintained constant manually.
|- 
|| Cursor to '''Bus 1 '''and '''Bus 2'''



|| '''Bus 1''' and '''Bus 2''' are connected through a '''transformer'''.
|- 
|| Cursor to '''Bus 2 '''and '''Bus 3'''

|| '''Bus 2''' and '''Bus 3''' are connected through two parallel '''power lines'''.
|- 
|| Cursor to '''Bus 3 '''and '''Infinite bus.'''
|| '''Bus 3''' is connected to the infinite''' bus.'''
|- 
|| Cursor to '''Three phase balanced fault block'''
|| '''Three phase balanced fault block''' is connected to '''Bus 2.'''

So here '''Bus2 '''is the '''fault bus.'''

I am scrolling up.
|- 
|| Cursor pointing on the '''System Data '''block
|| The '''System Data''' block is used to set the '''System base''' and '''Frequency'''.
|- 
|| Point to '''System Data '''block values
|| In this case, we can see that the '''system base''' is set at '''100 MVA''' and '''frequency''' at '''50 Hz'''.

I am zooming out.

For this, I am pressing ‘Ctrl’ and ‘-’ sign simultaneously
|- 
|| Double click on the components to open parameter window.
|| Before compiling the '''model, parameters''' and '''power flow data''' are required for all the components.

Double click on the generator model to open the parametric window.

These '''power flow data '''are the''' '''initial start values.

These can be obtained from '''PSAT or PSS/E''' which are the '''simulation''' tools.
|- 
|| 

/* Simulating a Class */ 
|| Here I have already entered the required data.

Let us now try to '''simulate''' the '''model'''.

I am closing this parameter window.
|- 
|| 
|| Now we will check the correctness of the '''model'''.
|- 
|| Click on '''Check all Models '''button.
|| Click on '''Check All Models''' button which is in the top '''toolbar'''.
|- 
|| Point to the '''Messages Browser '''window
|| In the messages browser, if we scroll up we can see, there are '''99 '''equations in the '''model''' and '''99 variables'''.

From this, we can say this '''model''' is solvable.
|- 
|| Close the '''Messages Browser'''
|| Close the '''Messages Browser''' at the bottom.
|- 
|| 
|| Let us proceed to the '''simulation'''.
|- 
|| Click on the '''Simulation Setup.'''
|| Click on the '''Simulation Setup''' option in the '''toolbar'''.
|- 
|| Point to '''Simulation Setup-SMIB_model '''window
|| '''Simulation Setup-SMIB_model '''window opens.

Here we set up the '''solver''' and other parameters for the '''simulation'''.
|- 
|| '''Stop Time >> 20'''
|| Under '''Simulation Interval''', change '''Stop Time''' to '''20''' secs.
|- 
|| Point to '''dassl''' and '''tolerance '''value.

|| Here, we are using '''Dassl integration algorithm''' with '''tolerance''' of '''1e-06'''.
|- 
|| Point to '''Simulate '''checkbox
|| Ensure that '''Simulate '''checkbox is checked.
|- 
|| Click on '''Ok''' at the bottom.
|| And then click on the '''Ok '''button at the bottom.
|- 
|| /* Switching to Simulation Output Window */ 
|| During the execution of the '''simulation''', a new window opens.
|- 
|| hover the mouse on the simulation output window. 
|| It shows the '''compilation''' process of the '''class'''.
|- 
|| Point to the success message.
|| After the '''simulation''' is successful executed, close the '''Simulation Output''' window.
|- 
|| /* Switching to Plotting Perspective */ 

|| By default, '''Plotting Perspective''' opens in the '''OMEdit''' window.
|- 
|| Switch to '''Variables Browser. '''
|| At the right of '''Plotting Perspective''', look at the '''Variables Browser''' window.
|- 
|| Expand the model and each component in '''Variables Browser'''
|| We can see all the '''variables''' by clicking on the '''Expand''' button of the particular component.
|- 
|| 
|| Now let’s see the '''voltage profile''' at the '''fault bus''' i.e. at '''Bus 2.'''
|- 
|| Show the '''Variables Browser'''

|| Expand the '''SMIB_model,''' if it is not already open in the '''Variables Browser'''.
|- 
|| Click on '''B2.'''
|| Click on the right arrow button of '''B2 (Bus 2).'''

We can see all the parameters of the '''bus'''.
|- 
|| 

Click on '''V '''checkbox.
|| Now click on the '''V '''checkbox which is at the left-hand side of the '''voltage parameter (V).'''
|- 
|| Cursor on '''voltage''' profile of '''Bus 2.'''

|| This plots the graph of '''Voltage''' at '''Bus 2'''.

Let me close the messages browser for better view.

The '''Y-axis '''unit is''' '''in '''per unit '''and the '''X-axis '''unit is '''seconds.'''
|- 
|| Point to '''X-axis.'''

|| Here we can see the plot starts from '''0''' seconds and ends at '''20''' secs.
|- 
|| Zoom in the time plot


Cursor on the plot.

|| During the fault i.e. from the duration '''0.5''' to '''0.57''' secs, there is a huge dip in the '''voltage profile'''.


The fault is cleared at '''0.57''' secs.


Then the '''voltage''' doesn't rise quickly to its '''steady state value''' but oscillates about it.
|- 
|| Point to the '''Voltage''' value at '''t=12.5''' secs.
|| The '''voltage''' settles down after about '''12.5''' secs.

This time can be reduced by adding additional '''controls''' to the '''generator'''.
|- 
|| Cursor on the '''voltage profile''' plot
|| We can also see that the '''voltage''' doesn't drop down to zero at this '''Bus,''' though it is the '''fault bus'''.

This is because of the '''fault impedance''' involved.
|- 
|| Expand '''B2''' and '''B3 '''buses
|| We can also view the '''voltage profiles''' of the other '''bus''' i.e. '''B1'''.

For this expand '''B1 '''in variables browser.

Now click on the checkbox of ‘v’ parameter.

After selecting '''B1''' and '''B2 voltages''', we can clearly see the '''voltage '''drop between the '''buses'''.
|- 
|| Clear the plot
|| Now clear these plots by unchecking the '''parameter''' checkboxes.
|- 
|| Show the plot of '''Delta curve''' of generator
|| It is also possible to plot the '''Delta curve''' of the '''generator'''.


This indicates whether the '''system''' is '''accelerating''' or '''stable'''.

I am scrolling down.
|- 
|| Expand '''order61'''
|| For this, expand '''order61''' which is a sixth '''order generator.'''

Here we can see all the '''variables''' of the '''generator'''.
|- 
|| Click on the '''delta '''checkbox
|| Click on the checkbox of '''delta''' to plot its graph.
|- 
|| Point to the '''plot window'''
|| From the graph, we can see the '''system''' is accelerated when the '''fault''' occurs at '''0.5''' secs.

The '''delta''' then oscillates about the '''steady-state value''' after the '''fault''' is being cleared.

It settles down after some time making the '''system stable.'''
|- 
|| '''Slide Number 6'''

'''Summary'''
|| Let us now summarize.

In this tutorial, we have learnt:
* About '''SMIB'''
* Setup initial values and '''power flow data'''
* '''Compile''' a '''model'''
* '''Simulation''' and its setup
* And interpreting the results obtained


|- 
|| '''Slide Number 7 '''

Assignment
|| As an assignment:

We recommend that you open different examples under the library.

And then simulate and explore the results.
|- 
|| '''Slide Number 8'''

Power System Simulation Project
|| The FOSSEE team invites contributions to develop '''power system networks''' using '''OpenIPSL library.'''


We give honorarium and certificates to those who do this.


For more details, please visit this site.

[https://om.fossee.in/powersystems https://om.fossee.in/powersystems] 
|- 
|| '''Slide Number 9'''

About the Spoken Tutorial Project
|| Watch the video available at the following link.


[https://spoken-tutorial.org/What_is_a_Spoken_Tutorial https://spoken-tutorial.org/What_is_a_Spoken_Tutorial]

It summarizes the Spoken Tutorial project.
|- 
|| '''Slide Number 10'''

Spoken Tutorial Workshops
|| The Spoken Tutorial Project Team conducts workshops and gives certificates.
* 
* For more details, please write to us.

|- 
|| '''Slide Number 11'''

Forum slide
|| Do you have questions in this '''Spoken Tutorial?'''
Please visit this site.


Choose the minute and second where you have the question.


Explain your question briefly.


Someone from the '''FOSSEE '''team will answer them.
|- 
|| '''Slide Number 12'''

Forum for specific questions:
|| * Do you have any general/technical questions on '''OpenModelica'''?
* Please visit the FOSSEE forum and post your question


|- 
|| '''Slide Number 13'''

Textbook Companion Project
|| The '''FOSSEE '''team coordinates coding of solved examples of popular books.


We give honorarium and certificates to those who do this.


For more details, please visit this site.
|- 
|| '''Slide Number 14'''

Lab Migration Project
|| The '''FOSSEE '''team helps migrate commercial simulator labs to '''OpenModelica'''.


We give honorarium and certificates to those who do this.


For more details, please visit this site.
|- 
|| '''Slide Number 15'''

Acknowledgements
|| '''Spoken Tutorial '''and '''FOSSEE '''projects are funded by '''NMEICT, MHRD''', Government of India.
|- 
|| '''Slide Number 16'''

Thanks
|| This tutorial is created by Samboju Sai Kiran.


Thank you for joining. 
|-
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