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Impact of smart transformer voltage and frequency support in a high renewable penetration system

Chen, Junru; Liu, Muyang; De Carne, Giovanni; Zhu, Rongwu; Liserre, Marco; Milano, Federico; O'Donnell, Terence

Abstract (englisch):
Increasing penetration of power electronics interfaced generation decreases the stability of the system, due to the absence of the rotational inertia in their operation. Emulation of the inertia using converter controls in combination with storages can address this issue. However, this method relies on the use of large quantities of storage to compensate power during a transient power unbalance. Instead of increasing the supply, the smart transformer (ST), with a fast response, offers the possibility to dynamically regulate the demand. This paper investigates the use of an ST to dynamically control reactive power and demand to support voltage and frequency respectively in the grid. The demand is controlled dynamically to emulate inertia. From an analysis based on a 250 kVA, 10kV/400V LV distribution network, it is shown that a demand variation in the range of 6-10% can be achieved. These results are extended to a case study based on the entire all-Island Irish Transmission system which shows that widespread use of STs with these controls could potentially facilitate a 10% increase in wind penetration without the inclusion of any other storage.

DOI: 10.1016/j.epsr.2020.106836
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2021
Sprache Englisch
Identifikator ISSN: 0378-7796
KITopen-ID: 1000123440
Erschienen in Electric power systems research
Band 190
Seiten 106836
Vorab online veröffentlicht am 04.09.2020
Schlagwörter Smart transformer, Inertia emulation, Frequency support, Voltage support, High wind penetration
Nachgewiesen in Scopus
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