Methodology for Tuning MTDC Supervisory and Frequency-Response Control Systems at Terminal Level under Over-Frequency Events

Marta Haro-Larrode, Maider Santos-Mugica, Agurtzane Etxegarai and Pablo Eguia
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Marta Haro-Larrode: Department of Electrical Engineering, University of the Basque Country (Spain), 48013 Bilbao, Spain
Maider Santos-Mugica: Tecnalia Research and Innovation (Spain), 48160 Derio, Spain
Agurtzane Etxegarai: Department of Electrical Engineering, University of the Basque Country (Spain), 48013 Bilbao, Spain
Pablo Eguia: Department of Electrical Engineering, University of the Basque Country (Spain), 48013 Bilbao, Spain

Energies, 2020, vol. 13, issue 11, 1-20

Abstract: This paper proposes a methodology for tuning a supervisory and frequency-response outer loop control system of a multi-terminal direct current (MTDC) grid designed to transmit offshore wind energy to an onshore AC grid, and to provide frequency support during over-frequency events. The control structure is based on a master–slave scheme and ensures the achievement of frequency response, with specific implementation of the UK national grid code limited-frequency sensitive (LFSM) and frequency-sensitive (FSM) modes. The onshore AC grid is modelled with an equivalent frequency-response model to simulate the onshore AC grid dynamics under frequency deviations. The main innovation of this paper is the development of a methodology for tuning simultaneously two hierarchical levels of a MTDC coordinated control structure, i.e., the MTDC supervisor, given by the active power set point for slave terminal, and the slope of frequency-response functions at onshore terminals. Based on these two hierarchical levels, different strategies are evaluated in terms of frequency peak reductions and change of the frequency order type. Moreover, tuning guidance is given when a different MTDC control structure or different synchronous generator characteristics of the onshore AC grid are considered.

Keywords: multi-terminal HVDC grids; ancillary services; coordinated frequency control; grid code; frequency response; outer loop; master–slave; synchronous characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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