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Participant

Join Date: Mar 2011
Posts: 3

Wind Turbine In Digsilent

03/06/2011 5:20 AM

I have implemented a wind farm in Digsilent Power Factory, and now Ι am trying to run some simulations and see how the output power generated from the wind farm, varies dynamically with the wind speed. More specifically, Ι am running a DPL script, which reads the wind speed data for 24 hours (every 15 minutes for a whole day) from an excel file, and for each wind speed value, a power flow calculation is executed. The wind farm output power, changes as expected every 15 minutes according to the wind speed, but the simulation plot output (wind farm output power vs time), shows only the plot corresponding to the last calculated value of output power. Is there any way to create a dynamic plot and see how the output power changes for the whole day? In other words, how can I plot each value at each time interval, without effectively being replaced by the next value before it is plotted? Thanks for your time.

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Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#1

Re: Wind Turbine In Digsilent

03/06/2011 12:07 PM
  1. I do not understand what the problem is with the plot.
  2. Is "plot" a printed list or a pictorial graph?
  3. Are you saying all the values in the list are equal to the "just calculated" one?
  4. Whatever the display problem, I have always found it best to be able to get the correct values in a simple screen print or array or sequential text output file BEFORE doing a more difficult output display.
  5. Have you reached that point yet?

I have no idea what DPL is, but if it is a typical programming language, a simple mistake like a comma in a print command can make a new value overwrite the last - instead of putting it on a new line!

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Participant

Join Date: Mar 2011
Posts: 3
#3
In reply to #1

Re: Wind Turbine In Digsilent

03/08/2011 5:54 AM

Thanks for your advices, but that's not what i' am looking for. What i actually want, is a command in DPL (Digsilent programmable language), similarly to the '' hold on '' command of matlab.

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Guru

Join Date: Feb 2011
Posts: 1119
Good Answers: 11
#2

Re: Wind Turbine In Digsilent

03/06/2011 10:11 PM

Read something about the concept of integral calculus.

The concept there is the lesser time interval you have for reading, the more accurate you go approaching to real time plots of Power vs. time. (see figure)

Y-axis is your Power, X-axis is your time

The smaller the rectangles the better the measurements--> means the smaller the time intervals of reading inputs to your data logger (excel interfaced)

Say for example, instead of having the reading time interval of 15 minutes, you upgrade or replace your system with a higher baud rate I/O system. Meaning a system which is capable to have reading say 100x per second. When input to data logger or on excel, you can have a fine trend with you parameters Power vs. Time. (Power x time = Energy - this is the area bounded by the plot)

By using such, you can now have a dynamic trend that corresponds to approach real time reading.(actual thing)

Cheerz

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Participant

Join Date: Mar 2011
Posts: 3
#4
In reply to #2

Re: Wind Turbine In Digsilent

03/08/2011 5:54 AM

Thanks for your advices, but that's not what i' am looking for. What i actually want, is a command in DPL (Digsilent programmable language), similarly to the '' hold on '' command of matlab.

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Anonymous Poster #1
#5

Re: Wind Turbine In Digsilent

04/06/2014 10:03 PM

Can I get your DPL script?

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