A Power-Quality Measure

A power-quality (PQ) measure is introduced in this paper. The proposed measure, based on the Shannon's entropy, expresses the deviation of the examined voltage cycle from the ideal one. Two entropy concepts are introduced - the spectral and the probabilistic entropy. The two entropies, calculat...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2008-04, Vol.23 (2), p.553-561
Main Authors: Katsaprakakis, D.A., Christakis, D.G., Zervos, A., Voutsinas, S.
Format: Article
Language:English
Subjects:
Applied sciences
Area measurement
Cartesian coordinate system
Deviation
Disturbances
dynamic
Electric potential
Electric power generation
Electric variables measurement
Electrical engineering. Electrical power engineering
Electrical power engineering
Entropy
events
Exact sciences and technology
Frequency
Mathematical analysis
measure
Miscellaneous
Operation. Load control. Reliability
power
Power electronics, power supplies
Power measurement
Power networks and lines
Power quality
Power system dynamics
Power system security
quality
security
Spectra
Time measurement
variations
Voltage
Voltage measurement
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Summary:A power-quality (PQ) measure is introduced in this paper. The proposed measure, based on the Shannon's entropy, expresses the deviation of the examined voltage cycle from the ideal one. Two entropy concepts are introduced - the spectral and the probabilistic entropy. The two entropies, calculated for every voltage cycle, are properly combined to provide the PQ measure. The PQ measure is represented graphically on a 2-D Cartesian coordinate system. The PQ measure is calculated for the most common PQ disturbances. The graphical representation of the calculated PQ measurements leads to the definition of an area of acceptable PQ on the PQ measure 2-D diagram. The PQ of a power system may be evaluated by the proposed measure, by implementing voltage measurements during predetermined time periods in selected network nodes. The produced electricity price may be configured in terms of the measured PQ.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2007.915974