DESING OF LOW COST AN EMBEDDED POWER QUALITY MONITORING SYSTEM

Öz

In this study, a low-cost monitoring system is designed which reliable determing power quality problems, making the measurement of instantaneous current and voltage values , and can perform harmonic analysis and the reactive power calculation and reporting long-term. The designed system allows processing and storage large amounts of data in real time. The mini- ITX PC motherboard is preferred for small size, low price and high performance features. Power quality monitoring software in C # programming language is designed to operate in real-time. Due to the real-time operating requirements for the operation of the software Windows 7 Embedded operating system is used . For measurements and computation sensor circuits, signal conditioners and TMS320F28069 digital signal processor is used.Using information transmitted to the embedded system with high-speed serial communication sampled by TMS320F28069, Fourier transform, total harmonic conversion, instantaneous active -reactive - apparent power calculations are performed. For an accurate measurement of the FFT, the current and voltage values are sampled according to variable sampling time proportional to the fundamental frequency of instantaneous voltage.

Anahtar Kelimeler

• Power system harmonic analysis,total hormonic distorsion,Power quality monitoring,variable timing sampling,FFT

DÜŞÜK MALİYETLİ BİR GÖMÜLÜ GÜÇ KALİTESİ İZLEME SİSTEMİ TASARIMI

Öz

Bu çalışmada, güç kalitesi problemlerinin belirlenebileceği, anlık akım ve gerilim değerlerinin ölçümünü yapan, harmonik analizlerini ve reaktif güç hesaplamalarını gerçekleştirebilen, gerektiğinde uzun dönemli raporlandıran, düşük maliyetli bir izleme sistemi tasarlanmıştır. Tasarlanan sistem, büyük miktarda verinin gerçek zamanlı işlenmesine ve depolamasına olanak sağlamaktadır. Temel donanım olarak küçük boyutları, düşük fiyat ve yüksek performans özellikleri nedeni ile mini-ITX pc anakartı tercih edilmiştir. Enerji kalitesi izleme yazılımı C# programlama dili kullanılarak gerçek zamanlı çalışabilecek şekilde hazırlanmıştır. Gerçekleştirilen yazılımın gerçek zamanlı çalıştırılabilmesi gereksiniminden dolayı Windows 7 Embedded işletim sistemi kullanılmıştır. Ölçüm ve hesaplamalar için sensör devreleri, sinyal şartlandırıcılar ve TMS320F28069 dijital sinyal işlemcisi kullanılmıştır. TMS320F28069 ile örneklenip yüksek hızlı seri iletişim ile gömülü sisteme aktarılan bilgiler kullanılarak, Fourier dönüşümü, toplam harmonik dönüşümü, anlık aktif-reaktif-görünür güç hesaplamaları yapılmaktadır. Burada doğru bir FFT ölçümü için akım ve gerilim örnekleri anlık gerilimin temel frekansıyla orantılı olarak değişken örnekleme zamanlı bir şekilde alınmıştır.

Anahtar Kelimeler

• Güç kalitesi görüntüleme,Harmonikler,Gömülü sistemler,Dijital Sinyal İşleme

Kaynakça

1. [1] D. Chapman, Introduction To Power Quality. Copper Development Association, United Kingdom, (2001).
2. [2] IEEE Recommended Practice and Requirements for Harmonics Control in Electric Power Systems, IEEE Standarts 519-1992, Piscataway, NJ, (1992).
3. [3] H. C. Lin ,“Remote Real-time Power System Harmonics Detection And Monitoring Via The Internet” , 2005 IEEE International Conference on Systems, Man and Cybernetics Volume:3, 2867-2872, (2005).
4. [4] P. Lu,S. Su., G. Liu , H. Rong , L. Zheng, “ A New Power Quality Detection Device Based on Embedded Technique” , IEEE Third International Conference On Electric Utility Deregulation And Restructuring And Power Technologies, 1635-1640, (2008).
5. [5] X. Huang, Y. Huang,L. Li, “Design Of The Power Quality Monitoring System Of Harmonic Based On DSP”, International Conference On Electronics, Communications and Control (ICECC), 1428- 1431, (2011).
6. [6] T. Atalik, I. Cadirci, T. Demirci, M. Ermis, T. Inan, A.S. Kalaycioglu, O. Salor, Multipurpose Platform for Power System Monitoring and Analysis With Sample Grid Applications, IEEE Transactions On Instrumentation and Measurment Cilt:63 Sayı:3, 566-582, (2014).
7. [7] S. Su, G. Liu, X. Luo,” A New Power Quality Monitoring and Management System Based on Embedded computer Technique”, International Conference on Intelligent Computation Technology and Automation, 957-960, (2008).
8. [8] B. Vural, A. Kızıl, M. Uunoğlu,” A power quality monitoring system based on MATLAB server pages”, Turk Journal Electrical Eng & Comp Sci, Vol.18 No.2, 313-325, (2010).

9. [9] Y. Ling, W. Jia, W. Qin, “The Research and Design of Power Quality Monitoring System Based on ARM and DSP”, Third International Conference on Instrumentation, Measurement, Computer Communication and Control, 686- 689, (2013).
10. [10] International electrotechnical Commision, “IEC 61000-3-2:2005”, (2009).
11. [11] H. Akagi , Y. Kanazawa, A. Nabae, “Generalized Theory of the Instantaneous Reactive Power in Three-Phase Circuits”, Proc. of IEEJ International Power Electronics, s. 293-297, (1983).
12. [12] M.T. Haque , T. Ise, “Implementation Of Single-Phase PQ Theory” , Power Conversion Conference PCC – Osaka Volume:2, s.761-765, (2002).
13. [13] B. Dobrucky, H. Kim, V. Racek, M. Roch, M. Pokorny, “Single-phase Power Active Filter and Compensator Using Instantaneous Reactive Power Method”, IEEE Power Conversion Conference Volume:1, Osaka, 167-171, (2002).
14. [14] K. Vardar, T. Surgevil, E. Akpinar,” Evaluation of Reference Current Extraction Methods for DSP Implementation in Active Power Filters”. Electric Power Systems Research, Volume 79, 1342- 1352, (2009).
15. [15] S. Rechka, E. Ngandui, J. Xu, P. Sicard, “A Comparative Study of Harmonic Detection Algorithms for Active Filters and Hybrid Active Filters”. IEEE PESC, s. 357–363, (2002).
16. [16] A.J. Roscoe, R. Carter, A. Cruden, G.M. Burt, “Fast-Responding Measurements Of Power System Harmonics Using Discrete And Fast Fourier Transforms Wıth Low Spectral Leakage”, Renewable Power Generation, Edinburg, 1-6, (2011).
17. [17] Adaptive Real-Time DSP Architecture to Monitor Harmonic Components and Various Power Quality Factors in Electric Power Grids By Gabriel Antonesei, Analog Devices Inc., (2011).
18. [18] İnternet: http://en.wikipedia.org/wiki/Goertzel_algorithm, Erişim tarihi: 07.02.2015.
19. [19] Novel Harmonic Analysis Method Improves Accuracy, Reduces Computation Overhead in Smart meters by Petre Minciunescu and Gabriel Antonesei, Analog Devices Inc, (2011).
20. [20] Texas Instruments Inc , “C28x Solar Library V1.2 Module User’s Guide”, C28x Foundation Software, (2014).
21. [21] Texas Instruments, TDMX320F28069USB Control Stick Datasheet, USA, (2009).
22. [22] Intel Corporation, Product Brief Intel Desktop Board D2500hn Innovation Series, USA, (2011).
23. [23] A. Troelsen, Pro C# 2010 and the .NET 4 Platform, Apress, E-Book, (2010).
24. [24] Y. Shafranovich, Common Format and MIME Type For Comma-Separated Values (CSV) Files, SolidMatrix Technologies Inc, (2005).
25. [25] M. Topuz, “Gömülü Sistemler ile Enerji Kalitesi İzleme Sistemi Tasarımı”, Yüksek Lisans Tezi, Ağustos 2015.