140 - Proceedings of the International Multiconference on...

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Fig. 1. Traditional instruments (left) and software based virtual instruments (right) share the same architectural components, but radically different philosophies Proceedings of the International Multiconference on ISBN 978-83-60810-14-9 Computer Science and Information Technology, pp. 577 – 580 ISSN 1896-7094 CompactRIO Embedded System in Power Quality Analysis Petr Bilik Dpt. of Electrical Measurement VSB-Technical University Ostrava, Czech Republic Email: [email protected] Ludvik Koval Dpt. of Electrical Measurement VSB-Technical University Ostrava, Czech Republic Email: [email protected] Jiri Hajduk student VSB-Technical University Ostrava, Czech Republic Email: [email protected] Abstract― Electrical measurement department of VSB- Technical University has been involved for more than 14 years in research and development of Power Quality Analyzer built on Virtual Instrumentation Technology. PC-based power quality analyzer with National Instruments data acquisition board was designed and developed in this time frame. National Instruments LabVIEW is used as the development environment for all parts of power quality analyzer software running under MS Windows OS. Proved PC-based firmware was ported to new hardware platform for virtual instrumentation – National Instruments CompactRIO at the end of 2007. Platform change from PC to CompactRIO is not just code recompilation, but it brings up many needs for specific software redesigns. Paper describes how the monolithic executable for PC-based instruments was divided into three software layers to be ported on CompactRIO platform. The code for different parts of CompactRIO instrument is developed in a unified development environment no matter if the code is intended for FPGA, real- time processor or PC running Windows OS. Keywords― CompactRIO, FPGA, VxWorks, LabVIEW, Power Quality I. I NTRODUCTION HE MEMBERS of the Electrical Measurements Department have been involved into the research and development in the area of electrical power quality for more than fourteen years. During this period the PC-based power quality analyzer has been developed. T The basis of the solution is the software application designed and developed in the graphical development environment LabVIEW and running on a PC. The core of the application is the data acquisition process with adaptive sampling frequency. The sampling frequency and the length of the time window are chosen to follow the requirements of elemental standards for power quality area: IEC 61000-4-30 and IEC 61000-4-7. The software provides so called „gap free“ measurement by continuous data acquisition. The algorithm in conjunction with the 16-bit plug-in data acquisition board allows change of the sampling frequency on the fly. This eliminates measurement errors in frequency domain caused by the leakage that normally appears when the frequency of the measured signal is changing during the measurement period. Under this data acquisition core the software modules
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140 - Proceedings of the International Multiconference on...

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