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

Roni Luhtala, Tuomas Messo, Tomi Roinila, Henrik Alenius, Erik de Jong, Andrew Burstein and Alejandra Fabian
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Roni Luhtala: Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland
Tuomas Messo: Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland
Tomi Roinila: Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland
Henrik Alenius: Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland
Erik de Jong: Department of Electrical Engineering, Eindhoven University of Technology, 5600 Eindhoven, The Netherlands
Andrew Burstein: DNV-GL, 6812 Arnhem, The Netherlands
Alejandra Fabian: DNV-GL, 6812 Arnhem, The Netherlands

Energies, 2019, vol. 12, issue 14, 1-15

Abstract: 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.

Keywords: DC–AC power converters; grid impedance identification; power hardware-in-the-loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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