Piotr Łukaszewski
supervisor: Łukasz Nogal
The aim of my work is to develop an algorithm for the detection and identification of travelling waves resulting from short-circuits in medium-voltage grids. In the future, such an algorithm could be used in fault locators and in protection relays responsible for elimination of faults.
In the case of medium-voltage (MV) grids, the issue of travelling wave detection is more difficult than in the case of high-voltage (HV) grids because the instrument transformers used in the automation of these grids are mainly located in HV/MV substations and they are the only measurement points. Furthermore, MV grids, due to their shorter lines, are characterised by shorter wave propagation times and therefore require more precise detection methods in order to avoid mistakes caused by short time intervals between arriving waves and their interference. Greater precision is also a requirement resulting from the need to keep the relative error of locating faults small.
A novelty in the field of detection of travelling waves in electrical power system is the matrix pencil method, which has already been proposed for use in HV grids. This method can meet the requirements set out earlier. Unfortunately, the applications of this technique in protective relaying so far lack the automation aspect of its operation and are limited to theoretical considerations only. This presentation aims to propose automation of the use of the matrix pencil method for the detection of traveling waves in MV grids.