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Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland
Department of Electrical Engineering, Eindhoven University of Technology, 5600 Eindhoven, The Netherlands
DNV-GL, 6812 Arnhem, The Netherlands
Authors to whom correspondence should be addressed.
Energies 2019, 12(14), 2674;
Received: 14 June 2019 / Revised: 27 June 2019 / Accepted: 8 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Modern Power System Dynamics, Stability and Control)
PDF [3898 KB, uploaded 12 July 2019]


Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab. View Full-Text
Keywords: DC–AC power converters; grid impedance identification; power hardware-in-the-loop DC–AC power converters; grid impedance identification; power hardware-in-the-loop

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Luhtala, R.; Messo, T.; Roinila, T.; Alenius, H.; de Jong, E.; Burstein, A.; Fabian, A. Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters. Energies 2019, 12, 2674.

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