Online Network Impedance Identification with Wave-Package and Inter-Harmonic Signals

Research output: Contributions to collected editions/worksArticle in conference proceedingsResearchpeer-review


In power system analysis the main supply at apoint of common coupling (PCC) is often presented by its Thévenin or Norton equivalent. In most cases these models adequately define the electrical characteristics of a PCC and are commonly used for power flow evaluations, fault estimations, as well as stability and power quality assessments. To determine the equivalent impedance of a PCC through analytical calculation or simulation precisely
may be challenging due to the complexity and time varying nature of power supply systems. Especially in medium- and low-voltage distribution networks with a high share of fluctuating consumers and generators a measurement may
be required to exactly capture the equivalent impedance over time. This contribution presents a method, which can be used to identify varying equivalent parameters of an AC power system with high accuracy and time resolution. To identify the network impedance the system is excited with
short sequences of current signals while measuring the corresponding voltage and current characteristics. The method is evaluated in a simulation model. Further on, impedance measurements on the low-voltage level are presented and discussed.
Original languageEnglish
Title of host publicationXII International School on Nonsinusoidal Currents and Compensation
Number of pages7
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Publication date31.07.2015
Article number7174700
ISBN (Electronic)978-1-4799-8415-2 (DVD), 978-1-4799-8416-9
Publication statusPublished - 31.07.2015
EventInternational Symposium on Networks, Computers and Communications - ISNCC 2015 - Łagów , Poland
Duration: 15.06.201518.06.2015

    Research areas

  • Energy research - AC power system modeling, impedance measurement, R/X ratio, Thevenin equivalent