Power Quality

Course 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.

Course is carried out on study programme

Elektrotehnika 2. stopnja

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.

Learning and teaching methods

Lectures, tutorials and laboratory practice. Part of the pedagogical process will be carried out with the help of ICT technologies and the opportunities they offer.

Intended learning outcomes

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.

Reference nosilca

1. HERMAN, Leopold, PAPIČ, Igor, BLAŽIČ, Boštjan. A proportional-resonant current controller for selective harmonic compensation in a hybrid active power filter. IEEE transactions on power delivery, Oct. 2014, vol. 29, no. 5, str. 2055-2065.

2. MAKSIĆ, Miloš, PAPIČ, Igor. Calculating flicker propagation in a meshed high voltage network with interharmonics and representative voltage samples. International journal of electrical power & energy systems, Nov. 2012, vol. 42, no. 1, str. 179-187.

3. BOŽIČEK, Ambrož, BLAŽIČ, Boštjan, PAPIČ, Igor. Performance evaluation of a time-optimal current controller for a voltage-source converter and comparison with a hysteresis controller. IEEE transactions on power delivery, 2011, vol. 26, no. 2, str. 859-868.

4. BOŽIČEK, Ambrož, BLAŽIČ, Boštjan, PAPIČ, Igor. Time optimal current control with constant switching frequency for STATCOM. Electric power systems research, 2010, vol. 80, no. 8, str. 925-934.

5. MAKSIĆ, Miloš, PAPIČ, Igor. The calculation of flicker propagation in part of the Slovenian transmission network. International journal of electrical power&energy systems, 2010, vol. 32, no. 9, str. 1037-1048.

Study materials

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.

Bodi na tekočem

Univerza v Ljubljani, Fakulteta za elektrotehniko, Tržaška cesta 25, 1000 Ljubljana

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