Power Quality

Subject description

Introduction to power quality, basic terms and definitions, overview of power quality standards. Transient phenomena, long term voltage deviations, short term voltage deviations, voltage unbalance. Waveform distortions; dc components, harmonics, interharmonics. Voltage fluctuations – flicker. Voltage sags and interruptions. Supply interruption indices.

Measurements of power quality parameters, permanent monitoring systems. Modelling of parts of power networks and loads for power quality analysis; system impedance characteristics. Methods of sharing responsibility for power quality distortion between network and customer side. Spreading disturbances across the network.

Measures for power quality improvement.

The subject is taught in programs

Objectives and competences

The student will acquire the knowledge of basic power quality terms and supply voltage characteristics and will also improve their knowledge of measurement performance, analysis of measurement results of power quality parameters, and possible measures to improve power quality.

Teaching and learning methods

Predavanja, avditorne vaje, laboratorijske vaje. Del pedagoškega procesa bo izveden s pomočjo IKT tehnologij in možnosti, ki jih ponujajo.

Expected study results

After successful completion of the course, students should be able to:

– explain the importance of power quality for the operation of power networks and customer supply,

– distinguish between the main parameters of voltage quality and compensation methods,

– analyze simple cases of harmonic distortion and flicker spreading,

– use the knowledge for practical application of measurements and power quality analysis,

– make the connection between the quality of supply, compensation planning and consequences of poor quality of supply,

– use the knowledge of measurement procedure and analysis of measurement results in the frame of other measurements.

Basic sources and literature

Dougan, R.C., McGranaghan, M.F., Wayne Beaty, H., Electrical Power Systems Quality, McGraw-Hill, 1996.

Blume, D., Schlabbach, J., Stephanblome, T., Spannungsqualität in elektrischen Netzen, VDE-Verlag, 1999.

Bollen, M.H.J., Understanding Power Quality Problems – Voltage Sags and Interruptions, IEEE, 2000.

Arrillaga, J., Smith, B.C., Watson, N.R., Wood, A.R., Power System Harmonic Analysis, Wiley, 2000.

Arrillaga, J., Watson, N.R., Chen, S., Power System Quality Assessment, Wiley, 2001.

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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana

E:  dekanat@fe.uni-lj.si T:  01 4768 411