Power Quality

Course: Power Quality

Code: 3ФЕИТ09004

ECTS points: 6 ECTS

Number of classes per week: 3+0+0+3

Lecturer: Asst. Prof. Dr. Jovica Vuletikj

Course Goals (acquired competencies): Introduction to basic concepts, principles and theories for power quality assessment. Measures and techniques for improving the quality of supply. Study of the causes and consequences of various types of disturbances: variation of frequency, harmonics, slow and rapid voltage variations, flickers etc. Measures for problem mitigation and training for design of electrical networks for the purpose of improving the quality of supply. Use of commercial software for various power quality analysis.

Course Syllabus: Introduction to power quality. Basic terms and definitions, importance and suitability of the subject matter, type of studies. Voltage variations during normal operating modes – over-voltage and under-voltage and voltage flicker. Definitions, sources and consequences. Voltage sags. Definitions, characteristics and types of voltage sags, voltage sag propagation and representation, consequences, voltage sag simulation, procedure review for performance assessment, effects of transformation and connection of consumers to the propagation of the voltage sag and features. Voltage sag testing and comparison. Equipment sensitivity to voltage variations. Expected financial losses from voltage sags. Harmonics. Definitions, sources and consequences. Fourier analysis, harmonic resonance, design of harmonic filters. Transients caused by atmospheric discharges and by various commutations in the network. Characteristics, occurrence and mitigation. Voltage unbalance. Sources of unbalance. Consequences from voltage unbalance. Methods for analyzing unbalanced operating modes. Unbalance due to network operation in unbalanced mode. Recommended measures that are used to solve the problem of quality of supply, device types and their basic characteristics. Review of international norms and standards.

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