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Stojković, J. (author), Shetgaonkar, A.D. (author), Stefanov, Predrag (author), Lekić, A. (author)This paper explores the possibilities of providing fast frequency support as an emergency support service to the disturbed AC system through the MTDC grid. A two-layer hierarchical control structure of the MTDC grid is proposed to assure the minimum cost of the frequency control actions, the minimum voltage deviations, or the minimal impact...journal article 2023