NEW INSTRUMENT FOR HARMONICS AND INTERHARMONICS MEASUREMENT FOR POWER SUPPLY SYSTEMS AND EQUIPMENT CONNECTED THERETO |
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| Massimo Aiello, Antonio Cataliotti, Salvatore Nuccio |
- Abstract:
- In the last years the increased interest about power quality, forced international working groups to define new standards for testing and measurement techniques applied to power systems. A particular attention has been paid to harmonic and interharmonic measurements for the well-known problems related to different power equipments. Considering the actual state of instrumentation technology, these standards assumes that only instruments using the Discrete Fourier Transform (DFT) are likely to be designed. Moreover, also if strictly speaking the concepts for distortion analysis can be applied only to steady state signals, draft and revision standards introduce a simplified procedure to evaluate general non stationary harmonic components and in particular interharmonics. These procedures are based on a hard limit for signal synchronous sampling and on different groupings and smoothings applied to the obtained spectrum. This allows assuring a complete and standardized interpretation of harmonic and interharmonic signal pollution. In this work, Authors present a software instrument developed in accordance with all in force, draft and under revision standards and international documents (IEC 61000 Part.3, Draft IEC 61000-4-30 Ed. 2000, Draft revision IEC 61000-4-7 Ed. 2000, Draft Guide IEEE P1159.1 ed. 2000, able to perform an on line voltage or current distortion analysis. The instrument has been tested and the result is that it can be used as a reference performance instrument, then where precise measurements are necessary, e.g. verifying compliance with standards, resolving disputes or for accurate emission measurements.
- Keywords:
- power quality, draft revision IEC 61000-4-7 ed 2000, harmonic and interharmonic analysis
- Download:
- IMEKO-TC4-2002-161.pdf
- DOI:
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