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LabVIEW for Power Quality Monitoring

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cjekanem

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Hi,
I'm a LabVIEW beginner and I have a school project with the subject above. On acquring my signals, I need to measure certain power parameters and disturbances. I do not know the step-by-step means to achieve this in LabVIEW. Please, please, please recommend specific books or links that can take me through this. My deadline is almost here. How can I re-download the evaluation version on my PC?
 

Hi cjekanem,
Its really nice to select LabVIEW for doing school project. Could you please elaborate little more. so that we can get idea, how to help you.
 

vinoth8051 said:
Hi cjekanem,
Its really nice to select LabVIEW for doing school project. Could you please elaborate little more. so that we can get idea, how to help you.
Click to expand...

I want to measure RMS values of V and I, plot graphs of harmonic content, calculate power factor, plot the phasor diagrams of V and I, show power values (watts, Var and VA) etc. I'm using the Electrical Power measurement palette in LabVIEW 2010 but I really dont know how to begin. Thanks if you can help me.
 

I am not sure how much basics in labVIEW have you got. Nice tutorials are available,i can share, explore them. once you got grip, you will be finding easy to do the project.
What hardware are you using, how you are interfacing, how you are sure that data is acquired properly..
 

vinoth8051 said:
I am not sure how much basics in labVIEW have you got. Nice tutorials are available,i can share, explore them. once you got grip, you will be finding easy to do the project.
What hardware are you using, how you are interfacing, how you are sure that data is acquired properly..
Click to expand...

Thx Vinoth for not giving up on me. I am connecting the outputs of my LEM LV 25-NP and LTS 15-NP sensors to a NI SCB-68 connector block and then to a NI PCI-6229 DAQ board and I'm using LabVIEW 2010. I got slight basics of LabVIEW and so far I can use DAQ Assistant to acquire the signal, but after this step, I'm lost as to how to set up nice front panel and block diagram that can help me measure all the parameters I wrote earlier in the last post.
 

Hi cjekanem,
Sorry for my late reply... Virtual Instrumentation deals with "Acquire ---> Analyse ---> Display". Since data has acquired from sensor, work is almost done. For analysis check these two VIs...
1)Go to this location in your system c:\Program Files\National Instruments\LabVIEW 2010\examples\measure\maxmpl.llb\FFT and Power Spectrum Units.vi (Assuming you have installed Labview in default loaction).
This VI gives idea how to use Sampling rate, Vpeak,Vrms Phase, power spectrum, FFT Spectrum (Magnitude, phase), Power Spectral density etc

2) E:\Program Files\National Instruments\LabVIEW 2010\examples\measure\maxmpl.llb\Power Spectrum Measurement.vi (Assuming you have installed Labview in default loaction)
This VI Computes the averaged power spectrum of a simulated input signal. This example allows you to specify various averaging modes for your measurement, such as RMS averaging, vector averaging, or peak hold, as well as the number of averages. You can observe the influence of these averaging parameters, typically on the noise floor, and notice that vector averaging requires the use of a trigger in order to lower the noise floor without lowering the fundamental along with it. You also can specify the type of window to use in this measurement, such as a Hanning or Flat Top window.
I hav attached one more document " View attachment lv_spectral_tutorial.pdf".
More good VIs can be found in examples section. All you have to do is select your hardware and limit the results to hardware. (As shown in screen shot)



For customizing front panel refer the power point presentation "View attachment Better programming techniques.ppt". It gives overall view about color, border, spacing, tab controls, tip stips on control etc.

Hope this helps you...
 
vinoth8051 said:
Hi cjekanem,
Sorry for my late reply... Virtual Instrumentation deals with "Acquire ---> Analyse ---> Display". Since data has acquired from sensor, work is almost done. For analysis check these two VIs...
1)Go to this location in your system c:\Program Files\National Instruments\LabVIEW 2010\examples\measure\maxmpl.llb\FFT and Power Spectrum Units.vi (Assuming you have installed Labview in default loaction).
This VI gives idea how to use Sampling rate, Vpeak,Vrms Phase, power spectrum, FFT Spectrum (Magnitude, phase), Power Spectral density etc

2) E:\Program Files\National Instruments\LabVIEW 2010\examples\measure\maxmpl.llb\Power Spectrum Measurement.vi (Assuming you have installed Labview in default loaction)
This VI Computes the averaged power spectrum of a simulated input signal. This example allows you to specify various averaging modes for your measurement, such as RMS averaging, vector averaging, or peak hold, as well as the number of averages. You can observe the influence of these averaging parameters, typically on the noise floor, and notice that vector averaging requires the use of a trigger in order to lower the noise floor without lowering the fundamental along with it. You also can specify the type of window to use in this measurement, such as a Hanning or Flat Top window.
I hav attached one more document " View attachment 53395".
More good VIs can be found in examples section. All you have to do is select your hardware and limit the results to hardware. (As shown in screen shot)



For customizing front panel refer the power point presentation "View attachment 53394". It gives overall view about color, border, spacing, tab controls, tip stips on control etc.

Hope this helps you...
Click to expand...

Thanks a lot. Will put this to use tomorrow
 

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