Course detail

The power quality and EMC

FEKT-LPQ1Acad. year: 2012/2013

The power quality is characterized by the steady-state nominal frequency sine wave of voltage, which is symmetrical in the three-phase supply network. The power quality depends on a quality of the electrical power generation, the quality of the transmission and the distribution and on the quality of electrical power consumption as well. Backward disturbing influences of the individual power system components and their compatibility and cooperation in an industrial and distribution supply networks are the content of this course. The principles of the disturbance are demonstrated at practical examples.

Language of instruction

Czech

Number of ECTS credits

5

Mode of study

Not applicable.

Guarantor

prof. Ing. Jiří Drápela, Ph.D.

Department

Department of Electrical Power Engineering (UEEN)

Learning outcomes of the course unit

Student gets acquainted with conditions of power quality supply, with mechanisms and sources of connected disturbances and with electromagnetic compatibility of power systems assurance principles and techniques.

Prerequisites

The subject knowledge on the Bachelor´s degree level is requested.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

Assesment methods and criteria linked to learning outcomes

Evaluation of laboratory exercises records and exercises on PC. Spot assessment written and oral examination according to rules of FEEC.

Course curriculum

Electromagnetic compatibility of power systems. Definition and relevance of EMC; compatibility levels; power quality.
Distribution of the disturbance types; summary of backward disturbing influences of electrical appliances to the supply network.
The fundamental Czech, Europe and international legislative on EMC.
The harmonic distortion of current wave shape. Definition; sources; calculations and measurements.
Harmonic components propagation; frequency response characteristics of power networks.
Influence of harmonic distortion of the current on power lines and power transformers loading and sizing, as well as on circuit protection and measurement devices function.
The voltage distortion. Origin; contribution of a series and parallel resonance; voltage distortion propagation and its affect.
Voltage events. Voltage dips, overvoltages and supply interruptions. Definition; classification; origin and propagation.
Voltage events measurement and evaluation; appliances immunity to voltage dips and interruptions.
Voltage fluctuations and rapid changes. Definition; origin and propagation.
Disturbing impact of the voltage variation; flickering of light sources; measurement and evaluation.
Voltage asymmetry. Definition; origin and sources; voltage asymmetry measurement and impact on electrical appliances operation.
Voltage characteristics of electricity supplied by public distribution networks.
Power network analyzers and power quality monitors. Measurement of low-frequency conducted disturbances; voltage and current transducers.

Work placements

Not applicable.

Aims

Program of the course is to apprise students of power systems electromagnetic compatibility, disturbance types and sources with their backward disturbing influences to power systems and measurement of low frequency connected electromagnetic disturbances and related power quality.

Specification of controlled education, way of implementation and compensation for absences

The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible of the course and are updated for every academic year.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

KORENC, V., HOLOUBEK, J. Kompenzace jalového výkonu v praxi. IN-EL, Praha 1999, 123 stran, ISBN 80-86230-07-4 (CS)
Kůs, V. Vliv polovodičových měničů na napájecí soustavu. BEN, Praha 2002, 184 stran, ISBN 80-7300-062-8 (CS)
Tlustý, J. a kol. Návrh a rozvoj elektroenergetických sítí. ČVUT v Praze: Praha 2011, ISBN 978-80-01-04939-6 (CS)

Recommended reading

Vaculíková, P. a kol. Elektromagnetická kompatibilita elektrotechnických systémů. Grada Publishing, Praha 1998, 504 stran. (CS)

Classification of course in study plans

  • Programme EEKR-ML Master's

    branch ML-EEN , 1 year of study, summer semester, elective specialised

  • Programme EEKR-ML Master's

    branch ML-EEN , 1 year of study, summer semester, elective specialised

  • Programme EEKR-CZV lifelong learning

    branch EE-FLE , 1 year of study, summer semester, elective specialised

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

prof. Ing. Jiří Drápela, Ph.D.

Syllabus

Electromagnetic compatibility of power systems. Definition and relevance of EMC; compatibility levels; power quality.
Distribution of the disturbance types; summary of backward disturbing influences of electrical appliances to the supply network.
The fundamental Czech, Europe and international legislative on EMC.
The harmonic distortion of current wave shape. Definition; sources; calculations and measurements.
Harmonic components propagation; frequency response characteristics of power networks.
Influence of harmonic distortion of the current on power lines and power transformers loading and sizing, as well as on circuit protection and measurement devices function.
The voltage distortion. Origin; contribution of a series and parallel resonance; voltage distortion propagation and its affect.
Voltage events. Voltage dips, overvoltages and supply interruptions. Definition; classification; origin and propagation.
Voltage events measurement and evaluation; appliances immunity to voltage dips and interruptions.
Voltage fluctuations and rapid changes. Definition; origin and propagation. Disturbing impact of the voltage variation; flickering of light sources; measurement and evaluation.
Voltage asymmetry. Definition; origin and sources; voltage asymmetry measurement and impact on electrical appliances operation.
Voltage characteristics of electricity supplied by public distribution networks.
Power network analyzers and power quality monitors. Measurement of low-frequency conducted disturbances; voltage and current transducers.

Fundamentals seminar

2 hod., optionally

Teacher / Lecturer

prof. Ing. Jiří Drápela, Ph.D.

Syllabus

Definition of the nonlinear electrical appliance; harmonic components of different wave shapes; calculation of harmonic components propagation; sizing of power transformers and power lines loaded by harmonics; design of passive and active filters.

Exercise in computer lab

4 hod., compulsory

Teacher / Lecturer

prof. Ing. Jiří Drápela, Ph.D.

Syllabus

Modeling of disturbance sources.
Comprehensive power networks simulation.

Laboratory exercise

20 hod., compulsory

Teacher / Lecturer

prof. Ing. Jiří Drápela, Ph.D.

Syllabus

Accuracy of a RMS value measurement.
Power consumption characteristics measurement.
Test of harmonic components summation.
Summation of distorted currents in a neutral wire.
Measurement on a LC power factor correction bank.
Load sensitivity to voltage dips and short supply interruptions.
Lamps flickering caused by voltage fluctuation.
Voltage unbalance and harmonic distortion influence on induction machine operation.
Voltage magnitude and distortion in a three phase unbalanced power system.
Voltage characteristics measurement and evaluation.