Performance evaluation of wideband binary identification of grid impedance using grid-connected inverters

Nabil Mohammed*, Mihai Ciobotaru, Graham Town

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

3 Citations (Scopus)

Abstract

The application of the pseudo random binary sequence (PRBS) estimation technique for wideband grid impedance estimation using grid-connected inverters has gained more attention recently because of its several advantages. This includes its simple implementation in the control loop of the inverters and the small disturbance amplitude produced. In this context, this paper aims to evaluate the performance influences of the PRBS design parameters bit length, frequency resolution, and disturbance amplitude. This goal is achieved by exploring their effects on the grid impedance estimation accuracy and the produced total distortion (THD%+PRBS noise) of the inverter output current. A 3-phase balanced inverter system is simulated and investigated using MATLAB/Simulink based on a discrete-time model to show the trade-off of a real implementation such as the PRBS disturbance amplitude and the sampling frequency of the analog-to-digital converters. Simulation results show the trade-off between the investigated PRBS parameters and the accuracy and frequency range of the estimated grid impedance as well as the total distortion.

Original languageEnglish
Title of host publication2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-10
Number of pages10
ISBN (Electronic)9789075815313, 9789075815306
ISBN (Print)9781728123615
DOIs
Publication statusPublished - 2019
Event21st European Conference on Power Electronics and Applications - Genova, Italy
Duration: 3 Sep 20195 Sep 2019
Conference number: 21st

Conference

Conference21st European Conference on Power Electronics and Applications
Abbreviated titleEPE '19 ECCE Europe
CountryItaly
CityGenova
Period3/09/195/09/19

Keywords

  • Estimation technique
  • Impedance measurement
  • Voltage Source Inverters (VSI)

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