Reproducibility of Network Impedance Measurements Using Single-Frequency and Broadband Signal Injection

Research output: Contribution to book/conference proceedings/anthology/reportConference contributionContributedpeer-review



Characterization of frequency-dependent network impedance is vital for harmonic emission evaluation, stability studies as well as for the optimum design of power-line communication technologies. This work presents a simulation-based performance comparison of three techniques that are used to obtain the network harmonic impedance. Two broadband methods, the passive pseudo-random binary sequence and the active pseudo-random impulse sequence, and the single-frequency injection are investigated. The methods are first applied to a passive network and then extended to a network with nonlinear equipment such as power electronic converters. The methods' performance is evaluated in terms of mean impedance and sub-cycle impedance. While the results of all three methods are comparable for the passive network, it differs in the presence of nonlinear devices, especially for the sub-cycle impedance, with the single-frequency injection method demonstrating superior results. The passive-pseudo-random binary sequence method is inferior in the characterization of both average and sub-cycle impedance due to the absence of perturbations around the zero-crossings of the recorded line voltage. These results point to the need to carefully evaluate the perturbation techniques for accurate measurement of network impedance.


Original languageEnglish
Title of host publication2023 IEEE 13th International Workshop on Applied Measurements for Power Systems (AMPS)
Number of pages6
ISBN (print)979-8-3503-1241-6
Publication statusPublished - 29 Sept 2023


Title2023 IEEE 13th International Workshop on Applied Measurements for Power Systems (AMPS)
Duration27 - 29 September 2023
LocationBern, Switzerland

External IDs

ORCID /0000-0002-9052-3838/work/146167223
Scopus 85178068978



  • Performance evaluation, Passive networks, Impedance measurement, Power measurement, Power system harmonics, Harmonic analysis, Frequency measurement