DESING OF LOW COST AN EMBEDDED POWER QUALITY MONITORING SYSTEM

Year 2016, Issue: 036, 25 - 38, 15.06.2016

Mustafa Topuz Kadir Vardar

Abstract

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.

Keywords

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

DÜŞÜK MALİYETLİ BİR GÖMÜLÜ GÜÇ KALİTESİ İZLEME SİSTEMİ TASARIMI

Abstract

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.

Keywords

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

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