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Events at Department of Energy Technology

Industrial/PhD Course: Electromagnetic Transients in Power Systems

Time

21.10.2020 kl. 08.30 - 23.10.2020 kl. 16.00

Description

Organizer

Filipe Faria da Silva

Lecturer

Filipe Faria da Silva

ECTS: 3

Description

Power systems are constantly subjected to disturbances and switching actions. These actions can go from a normal connection/disconnection of a load or line, to the opening of a faulted line after a short circuit or the incidence of lightning strokes, among others. These events are known as electromagnetic transients and have a short duration in the range of microseconds/milliseconds, typically.

Even being short duration phenomena, electromagnetic transients are of fundamental importance, as the system is subjected to high currents, voltages and frequencies during those micro/milliseconds, which may damage the electrical equipment. As a result, extensive investigations are made when installing new high voltage equipment, in order to assure that the equipment is not subjected to high stresses.

The participants in the course will learn how to analyse electromagnetic transients and different transient phenomena will be explored through the use of examples and real-life examples. When relevant, the respective countermeasures will be explained and examples given on how to do their respective selection.

The course will also focus in the use of software tools for the simulation of the transients, more specifically EMTDC/PSCAD, which will be introduced and explained during the course. The importance of having a proper modelling of the equipment (e.g., overhead lines, underground cables, transformers, …) in function of the phenomena will be demonstrated and guidelines will be provided on how to define the modelling requirements for different transient phenomena.

Phenomena that will be studied in the course are:

  • Energisation and de-energisation of capacitor banks, shunt reactors, lines, transformers, …;
  • Travelling waves and switching phenomena;
  • Particularities of switching in HVAC cables (zero-missing, influence of bonding, etc…);
  • Energisation of transformers (inrush currents and other resonances);
  • Lightning simulation and back flashover;
  • Fault transients;
  • Impact of resonance points;
  • Guidelines for network modelling:
    • Network size;
    • Modelling precision;
    • Model validation;

Day 1: Basic concepts; Introduction to PSCAD; Basic switching operations (capacitor banks, shunt reactor); Travelling waves and modal domain;

Day 2: Underground cables; Transformers; Lightning; Resonances;

Day 3: Faults; Interruption of inductive currents; Network modelling (guidelines); Presentation of exercises for evaluation

Prerequisites

Master degree in Electric Power Systems or similar

Form of evaluation

Several exercises consisting in the simulation and analysis of different phenomena in an EMTP-type software must be done after the course. The attendees are expected to do a proper simulation of the phenomena, to comment the results and to propose solutions to the main issues, in a manner similar to an insulation co-ordination study.

Registration

https://phd.moodle.aau.dk

Price

6000 DKK for PhD students outside of Denmark and 8000 DKK for the Industry.

Host

Department of Energy Technology

Address

Aalborg University, Pontoppidanstræde 101, room 1.015, 9220 Aalborg East