Summary

This course addresses all the dimensions of Power Quality PQ issues including mitigation strategies. The focus is mainly on qualitative concepts and comprehensive coverage. This course introduces PQ definitions, limitations, related international standards and mathematical techniques for PQ analysis of Power Systems. Different identification, localization and classification techniques for PQ problems will be investigated. The various kinds of PQ problems and their effect on the load/system equipment will be looked at in detail. The mitigation strategies like passive filtering, active and hybrid power filtering, static VAR compensation, DVR, UPQC, etc will be investigated. Areas covered include voltage sags, interruptions, transients, flickers, harmonics and modeling and simulation of utility systems. The grounding imperfection as a major cause for PQ problems will be addressed in detail. Moreover, the requirements and impacts of distributed generation DG on the network power quality will be studied in detail. Effects of DG on voltage regulation, relaying, losses, islanding and standards will be examined.

Objectives

  1. Review the available definitions and standards of common power quality phenomena.
  2. Understand the different power quality monitoring, identification and classification techniques.
  3. Modeling and simulation of power distribution systems to investigate different PQ phenomena causes and effects.
  4. Understand and implement different techniques for power quality problems mitigation.

Course prerequisites

Basic understanding of modeling of power system elements and analysis techniques is required. Familiarity with a programming language and/or a simulation package such as EMTDC/PSCAD and MATLAB is desirable.

Main topics and delivery plan

  1. Review of power quality definitions and standards
  2. Exploring different identification, classification and localization techniques of PQ problems
  3. Harmonic analysis methodology, mitigation techniques and case studies
  4. Short and long duration voltage variation phenomena; cause, effects, mitigation, case studies
  5. Typical wiring and grounding problems affecting power quality and its solution
  6. Distributed generation and power quality; operating conflicts and network interfacing
Lectures Topic Sub-Topics
3 PQ Definitions and Standards
  • General Classification of PQ Phenomena
  • IEEE and IEC PQ Standards
3 PQ Monitoring and Measuring
  • Available monitoring techniques and their drawbacks
  • Commercial power quality monitors
  • Power quality monitors sensitivity
6 PQ Problems Identification, PQ Phenomena Classification
  • Identification and localization of PQ problems
  • Different PQ classification techniques and case studies
6 Harmonic Sources, Effects, Analysis, and Modeling Harmonic Distortion Mitigation
  • Voltage vs. Current Distortion
  • Harmonics vs. Transients
  • Harmonic Sources from Commercial and Industrial Loads
  • Time domain versus frequency domain
  • Different Harmonic filters (passive, active and hybrid); and case studies
6 Voltage Sag, Swell and Interruptions, Transient Over-voltages
  • Sources of Sags and Interruptions
  • Fundamental Principles of Protection
  • Motor-Starting Sags, Utility System Fault-Clearing Issues, and case studies
  • Sources of Transient Overvoltages; Principles of Overvoltage Protection and Switching Transient Problems with Loads
6 Voltage Flicker, Voltage Unbalance, Voltage Regulation
  • Sources of voltage flicker; Effects and mitigation techniques
  • Sources of voltage unbalance; Effects and mitigation techniques
  • Devices for Voltage Regulation; Utility Voltage Regulator Application and End-User Capacitor Application
6 Wiring and Grounding Practice in Distribution Systems
  • Typical Wiring and Grounding Problems
  • Solutions to Wiring and Grounding Problems
3 Distributed Generation Technology, DG Interfacing
  • DG Technologies; Regulating Utility Voltage with Distributed Resources; Power Quality Issues and Operating Conflicts
  • Interface to the Utility System and Interconnection Standards

References

  1. R. Dugan, M. McGranaghan, S. Santoso and H. Beaty, Electrical Power System Quality, Second Edition, McGraw-Hill, 2002, ISBN 0-07-138622-X.
  2. A. Ghosh and G. Ledwich, Power Quality Enhancement Using Custom Power Devices, Kluwer Academic Publications, 2002, ISBN 1-4020-7180-9
  3. J. Arrillaga, B. Smith, N. Watson and A. Wood, Power System Harmonic Analysis, John Wiley, 1997, ISBN 0-471-97548-6.
  4. E. Acha, V. Agelidis, O. Anaya-Lara and T.J. Miller, Power Electronics Control in Electrical Systems, Newnes, 2002, ISBN 0-7506-5126-1.

Contact

For more information, please contact directly the course coordinator Prof Ehab F. El-Saadany.