View source for OpenModelica-OpenIPSL/C2/Simulation-of-a-SMIB-using-OpenIPSL/English

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||'''Visual Cue'''
||'''Narration'''
|-
|| '''Slide Number 1'''
|| Welcome to the Spoken Tutorial on '''Simulation of a SMIB using OpenIPSL.'''
|- 
|| '''Slide Number 2 '''


'''Learning Objectives'''
|| In this tutorial, we will learn:
* How to '''simulate''' a controlled''' SMIB system'''
* Plotting''' voltage profiles''' of '''buses''' 
* Plotting '''delta curve '''of the generator
|- 
|| '''Slide Number 3'''

'''System Requirements'''
|| To record this tutorial, I am using

* '''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'''.
|- 
|| '''Slide Number 4'''

'''Prerequisites'''

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

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

For relevant '''OpenModelica '''tutorials, please visit our website. 
|- 
|| '''Slide Number 5'''
'''Prerequisites'''
|| Earlier in this series, we have already seen 

* How to connect a controlled '''SMIB system '''

|- 
|| '''Open the SMIB model from the earlier tutorial.'''
|| Let us open the '''SMIB system''' which we modelled in earlier tutorial. 

Also open the '''OpenIPSL library.'''
|- 
|| 
|| We have already opened the '''SMIB system'''.
|- 
|| '''Shift to network window and drag and drop Generator model onto it'''
|| Now the next task is setting up each component by entering the '''parameter''' '''data''' and '''power flow''' '''data.'''
|- 
|| '''Double click on the generator component'''
|| Let me enter the data for the '''generator model'''.

* 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.
|- 
|| 
|| I have entered all the data here.
|- 
|| Cursor pointing on the system data block
|| The '''system data block''' is used to set the '''System base''' and '''frequency'''.

In this case, we can see it is set to '''100 MVA''' as system '''base''' and '''frequency''' as '''50 Hz'''. 
|- 
|| Double click on the components to open parameter window.
|| Now as the '''parameters''' and '''power flow data''' are set for all the components, we are ready to simulate it. 
|- 
|| 
|| Before simulating the '''model''', save it to a desired location. 
|- 
|| Click on '''Check model'''
|| Firstly let us check the '''generator model''' by clicking on the tick mark icon at the top of the '''model'''. 

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.
|- 
|| Close the Check Model windows
|| Close the '''messages browser'''.
|- 
|| Click on the simulation setup
|| Let us proceed to the '''simulation''' of the '''network model.'''

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'''.
|- 
|| Cursor on the simulation setup window.
|| Here, I am using '''dassl method''' and '''tolerance''' of '''1e-06'''.

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.
|- 
|| Cursor on the Simulation output window
|| The '''simulation''' output window pops up.

This shows the compilation and running status of the '''simulation'''.

After the '''simulation''' is successful, close the '''simulation''' output window.
|- 
|| Show Plotting perspective
|| We can see that the window has been changed to '''plotting perspective'''.

On the right hand side, we can see all the components are listed in the '''Variables browser''' tab.
|- 
|| Expand the model and each component in variables browser.
|| Click on the '''Expand''' button which is on the left side of each component.

Now we can see all the variables under that particular component.
|- 
|| 
|| Now let me show you the '''voltage profile''' at the''' fault bus''' i.e. '''Bus 2'''
|- 
|| Show the '''variables browser'''
|| Click on the '''Expand''' button on the left hand side of '''Bus 2.''' 

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

Let me close the '''Messages''' browser for better view.
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|| 
|| The Y-axis unit is in '''Per unit''' and the X-axis unit is in '''seconds'''.

Here we can see the plot starts from 0 seconds and ends at 10 secs.
|- 
|| 
|| During the '''fault''' i.e. from the duration 0.5 to 0.57 secs, there is a huge dip in the '''voltage '''profile.
|- 
|| 
|| After the '''fault''' is cleared at 0.57 secs, the '''voltage''' rises quickly.
|- 
|| Cursor on the voltage profile of Bus 2 plot.
|| As the system is a controlled one, the voltage has less oscillations about its '''steady state value'''.

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'''.
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|| 
|| Earlier in the series, the '''SMIB''' which was modelled, was an uncontrolled one.
|-
|| 
|| Let’s compare the time taken by the uncontrolled '''system''' to that of a controlled one. 

We can see the settling time is reduced. 
|- 
|| 
|| This indicates that '''system''' regained its stability in less time with the help of controls like '''AVR''' and '''PSS'''.
|- 
|| Cursor on the voltage profile plot 
|| Here we can also see that the '''voltage''' doesn't drop down to zero at this '''Bus'''.

This is because of the '''fault impedance''' involved.
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|| 
|| We can also view the '''voltage profiles''' of the other '''bus '''i.e''' B1'''.
|- 
|| 
|| After selecting '''B2''' and '''B1 voltages''', we can clearly see the '''voltage drop''' between the '''buses'''.

This is the '''drop''' caused by the '''impedance''' of the '''transmission lines'''.
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|| Clear the plot
|| Now clear these plots by unchecking the '''parameter''' checkboxes.
|- 
|| Show the plot of Delta curve of generator
|| We can also plot the '''Delta curve''' of the '''generator'''.

This indicates whether the system is accelerating or stable.
|- 
|| Expand the '''generator''' and '''order61'''
|| For this, expand the '''generator''' and '''order61''' which is a '''sixth order generator. '''

Here we can see all the variables of '''generator'''.
|- 
|| Click on the checkbox of '''delta'''
|| Click on the checkbox of '''delta''' to plot its graph.
|- 
|| On the graph window
|| From the graph we can see the '''system''' is accelerated when the '''fault''' occurs at 0.5secs
|- 
|| On the graph window
|| The '''Delta''' then oscillates about the''' steady-state value''' after the '''fault''' is cleared.

It settles downs at 5.26 secs making the '''system stable'''.

|- 
|| 
|| This brings us to the end of this tutorial.
|- 
|| '''Slide Number 6'''

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

In this tutorial, we have learnt:
* How to simulate a controlled SMIB system
* Plotting voltage profiles of buses 
* Plotting delta curve of the generator
|- 
|| '''Slide Number 7'''

'''Assignment''' 
|| As an 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.
|- 
|| '''Slide Number 8'''

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

For more details, please visit this website.

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

'''About the Spoken Tutorial Project'''
|| The video at the following link summarises the Spoken Tutorial project.

Please download and watch it.
|- 
|| '''Slide Number 10'''

'''Spoken Tutorial Workshops'''
|| We conduct workshops using Spoken Tutorials and give certificates.

Please contact us.
|- 
|| '''Slide Number 11'''

'''Forum slide'''
|| Please post your timed queries in this forum
|-
|  | '''Slide Number 12'''

'''Forum for specific questions:'''
| | Please post your general queries in this forum
|- 
|| '''Slide Number 13'''

'''Textbook Companion Project'''
|| The '''FOSSEE ''' team coordinates the '''Textbook Companion ''' project.

For more details, please visit these sites.
|- 
|| '''Slide Number 14'''

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

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

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

'''Acknowledgements'''
|| We acknowledge the contributions made by Prof. Luigi Vanfretti and Biswarup for the models used in this series. 
|- 
|| '''Slide Number 17'''

'''Thanks'''
|| This is Usha signing off.

Thank you for joining. 
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