20.500.12556/DKUM-93261 Power-based concept for current injection by inverter-interfaced distributed generations during transmission-network faults This paper analyzes the influence of inverter-interfaced distributed generations’ (IIDGs) response during transmission network faults. The simplest and safest solution is to switch IIDGs off during network faults without impacting the network voltages. A more elaborate and efficient concept, required by national grid codes, is based on controlling the IIDGs’ currents, involving positive- and negative-sequence voltage measured at the connection point. In this way the magnitude and phase of the injected currents can be adjusted, although the generated power will depend on the actual line voltages at the connection point. Therefore, an improved concept is proposed to adjust IIDGs’ fault current injection through the required active and reactive power, employing the same voltage characteristics. The proposed, i.e., power-based concept, is more definite than the currentbased one, since the required power will always be generated. The discussed concepts for the fault current injection by IIDGs were tested in different 110-kV networks with loop and radial topologies, and for different short-circuit capabilities of the aggregated network supply. Based on extensive numerical calculations, the power-based concept during transmission networks faults generates more reactive power compared to the current-based concept. However, the voltage support by IIDGs during transmission networks faults, regardless of the concept being used, is influenced mainly by the short-circuit capability of the aggregated network supply. As regards distance protection operation, it is influenced additionally by the network topology, i.e., in radial network topology, the remote relay’s operation can be delayed due to a largely seen impedance. distributed generation fault current injection voltage support distance protection transmission network faults distribucijska omrežja napake distribucijskega omrežja distančna zaščita kratkostični tokovi true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/2076-3417/11/21/10437 © 2021 by the authors Članek v reviji 2025-06-16 13:53:19 2025-06-16 13:53:19 2025-06-17 03:09:18 0000-00-00 00:00:00 2021 0 0 str. 1-15 iss. 21 Vol. 11 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2021-10-02 2021-11-04 2021-11-06 621.31 84163331 10.3390/app112110437 2076-3417 applsci-11-10437.pdf applsci-11-10437.pdf 1 7CB6AF044B97C0BDB787592C57892325 3f5da2ba9ea62cd347f8fd48f28293c844f26f4c93dc301b46d4e31d9787dab3 e092f313-4aa8-11f0-a2f6-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=192274 https://www.mdpi.com/2076-3417/11/21/10437 0 e6eb677c-4aa8-11f0-a2f6-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=192275 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0