20.500.12556/RUL-133787 Proving a concept of flexible under-frequency load shedding with hardware-in-the-loop testing It is widely recognized that in the transition from conventional electrical power systems (EPSs) towards smart grids, electrical voltage frequency will be greatly affected. This is why this research is extremely valuable, especially since rate-of-change-of-frequency (RoCoF) is often considered as a potential means of resolving newly arisen problems, but is often challenged in practice due to the noise and its oscillating character. In this paper, the authors further developed and tested one of the new technologies related to under-frequency load shedding (UFLS) protection. Since the basic idea was to enhance the selected technology’s readiness level, a hardware-in-the-loop (HIL) setup with an RTDS was assembled. The under-frequency technology was implemented in an intelligent electronic device (IED) and included in the HIL setup. The IED acted as one of several protection devices, representing a last-resort system protection scheme. All main contributions of this research deal with using RoCoF in an innovative UFLS scheme under test: (i) appropriate selection and parameterization of RoCoF filtering techniques does not worsen under-frequency load shedding during fast-occurring events, (ii) locally measured RoCoF can be effectively used for bringing a high level of flexibility to a system-wide scheme, and (iii) diversity of relays and RoCoF-measuring techniques is an advantage, not a drawback. under-frequency load shedding intelligent electronic device proof of concept hardware-in-the-loop testing real-time digital simulator frequency stability margin rate-of-change-of-frequency podfrekvenčno razbremenjevanje pametne elektronske naprave potrditev koncepta preizkušanje v zaprti zanki simulator za dinamičlne izračune v realnem času rezerva true false true Angleški jezik Slovenski jezik Članek v reviji 2021-12-15 10:26:07 2021-12-15 10:26:09 2022-09-13 03:52:38 0000-00-00 00:00:00 2020 0 0 17 str. iss. 14, art. 3607 Vol. 13 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 537 1996-1073 10.3390/en13143607 24709891 RAZ_Sodin_Denis_2020.pdf RAZ_Sodin_Denis_2020.pdf 1 00859B5FD15D4FA860BC21AA03690D70 4b5ddbdfeb9b7a7ad76dda673e952374f4ad6bea10823e27bacb375e11bb8379 e25d0247-5d89-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152122 https://www.mdpi.com/1996-1073/13/14/3607 1 eae6f00a-5d88-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152121 Fakulteta za elektrotehniko 0 0 0