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Smart transformer-based medium voltage grid support by means of active power control

Giacomuzzi, Stefano; Langwasser, Marius; De Carne, Giovanni; Buja, Giuseppe; Liserre, Marco

Abstract (englisch):
In the last decades the voltage regulation has been challenged by the increase of power variability in the electric grid, due to the spread of non-dispatchable generation sources. This paper introduces a Smart Transformer (ST)-based Medium Voltage (MV) grid support by means of active power control in the ST-fed Low Voltage (LV) grid. The aim of the proposed strategy is to improve the voltage profile in MV grids before the operation of On-Load Tap Changer in the primary substation transformer, which needs tens of seconds. This is realized through reactive power injection by the AC/DC MV converter and simultaneous decrease of the active power consumption of voltage-dependent loads in ST-fed LV grid, controlling the ST output voltage. The last feature has two main effects: the first is to reduce the active power withdrawn from MV grid, and consequently the MV voltage drop caused by the active current component. At the same time, higher reactive power injection capability in the MV converter is unlocked, due to the lower active power demand. As result, the ST increases the voltage support in MV grid. The analysis and simulation results carried out in this paper show improvements compared to similar solutions, i.e. ... mehr

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Postprint §
DOI: 10.5445/IR/1000129431
Veröffentlicht am 09.02.2021
DOI: 10.30941/CESTEMS.2020.00035
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2096-3564
KITopen-ID: 1000129431
HGF-Programm 37.06.01 (POF III, LK 01) Networks and Storage Integration
Weitere HGF-Programme 37.12.03 (POF IV, LK 01) Smart Areas and Research Platforms
Erschienen in CES Transactions on Electrical Machines and Systems
Band 4
Heft 4
Seiten 285–294
Schlagwörter Smart Transformer, Solid State Transformers, Load Control, Voltage Support
Nachgewiesen in Dimensions
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