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Enhancing Power Quality Data Acquisition Device for Southern Company

This project focuses on designing a web-based interrogation and control system for a Power Quality Data Acquisition Device to improve voltage readings, temperature, and physical packaging. The team led by Dr. Mark Halpin and Glenn Wilson aims to enhance device accuracy, functionality, and packaging size. Through simulation and testing, they validate the true RMS meter's performance and temperature tolerance. Future work includes hardware implementation and remote interface integration.

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Enhancing Power Quality Data Acquisition Device for Southern Company

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  1. Web-based Interrogation & Control of a Power QualityData Acquisition Device

  2. DESIGN TEAM: Dr. Mark Halpin Glenn Wilson Team Advisor Team Leader Web Page Software Research & Design Jason Koberger True RMS meter Research & Design Hardware Testing & Simulation Melissa Wilson Documentation True RMS meter Research, Design & Simulation

  3. Need for improved data acquisition device for Southern Company Southern Company is our Co-op employer Motivation

  4. Problem • Signal Information is not Readily Available • Remotely • Nonexistent • On-site • Must have computer available

  5. Approach • On-site • 4-Channel Voltmeter • LCD Display Added • Good/Bad Signal Indicator • Button(s) to Cycle Through LCD Data

  6. Design Requirements • Accuracy:For voltage readings, the circuitry and display must begin reading at a minimum of 1 V and accurately read for low and high voltages. The RMS meter must also function as a true RMS meter.

  7. Design Requirements • Temperature: Circuitry must withstand 0 C minimum and 50 C maximum.

  8. Design Requirements • Physical Packaging: All design additions to the existing power quality device must be limited in size in order to fit in the existing box.

  9. Squared Integrated over 1 period RMS Output Signal Square Root Flow Diagram Incoming Signal

  10. Log Anti-Log x2 Miller Integrator RMS output Log Anti-Log x Flow Diagram Input Signal

  11. Analytical Calculation

  12. Circuit 1 Meter Design from Electronic Design News

  13. Simulation Results Vrms(actual) = 148.49 V Percent Error = 2.45 %

  14. Simulation Results Vrms(actual)=1.1 V Is this REALLY a true RMS meter?

  15. Peak RMS: True RMS: ≈ 0.7778 Vrms = 1.1 Vrms Proof: Simulated value: Vrms = 0.77649 V

  16. Circuit 2 Maxim RMS circuit

  17. Accuracy Results Vrms(actual) = 0.7071 V Percent Error = 0.15 %

  18. Accuracy Results Vrms(actual) = 148.49 V Percent Error = 0.15 %

  19. Accuracy Results Vrms(actual) = 1.1 V Percent Error = 0.18 %

  20. Temperature Results All simulation values between 147.95 V and 148.64 V. Less than 1% error!!!

  21. Temperature Results From 0º C to 50º C the % error is <1%

  22. Physical Packaging Results

  23. 6.3356 0.7093 3.7256 LCD Display 0.9379 3.5598 1 2 3 4 5 6 7 8 Note: All dimensions are in inches Physical Packaging Results

  24. Conclusions • Our circuit functions as a true RMS circuit. • The true RMS circuit can accurately read low and high voltages, as well as non-sinusoidal waveforms. • It operates properly throughout the required temperature range of 0º C to 50º C. • All circuitry can conform to the existing device.

  25. Future Work • Implement this circuit design in hardware form • Add display circuitry and current reading functionality • Implement remote interface

  26. Questions?

  27. References [1] “Home Power Quality,” http://energyoutlet.com/res/powerqual/index.html, Energy Outlet, Iris Communications, Inc, USA, 1996. [2] R. C. Dugan, M. F. McGranaghan, and H. W. Beaty, Electrical Power Systems Quality, McGraw-Hill, New York, New York, USA, p. 1-3, 1996. [3] W. M. Grady and A. H. Noyola, “End User and Electric Utility Perspectives,” Results of Power Quality Surveys in the United States, University of Texas at Austin, Austin, Texas, USA, 1995. [4] C. Peacock, “Interfacing the PC, ” http://www.beyondlogic.org/serial/serial3.htm, USA, February 28, 2000.

  28. References [5] T. Cambra, “Developing a Visual Basic Component for IIS/MTS,” http://msdn.microsoft.com/workshop/server/components/vbmtsiis.asp, Microsoft Development Network, USA, June 19, 1998. [6] D. Adair, J. Ball, and M. Pawlan, “Trail: 2D Graphics,” http://web2.java.sun.com/ docs/books/tutorial/2d/index.html, Sun Microsystems, USA. [7] P. Coleman and M. Halpin, “Long Term Monitoring”, 1999 Southeastern Meter School & Conference, pp. 2-3, Birmingham, Alabama, USA, 1999. [8] W. Berry, “COM Objects and ASP,” http://msdn.microsoft.com/workshop/server/ asp/comtutorial.asp, Microsoft Development Network, USA, January 12, 1998.

  29. References [9] “LCD Products,” http://www.eio.com/lcdprodt.htm, Electronics Information Online, USA, August 23, 2000. [10] “Newark Electronics” http://www.newark.com, Newark Electronics, USA, 2000. [11] R. Moffat, “ElectronicsCooling”, http://www.electronics-cooling.com/Resources/ECArticles/JAN97/jan97-01.htm, Stanford University, Stanford, California, USA, January 1997. [12] “California Instruments: Programmable AC Power Sources”, http://www.ixpres.com/calinst/acpower.htm, California Instruments, San Diego, California, USA, September 2000.

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