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

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 struc...

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Bibliographic Details
Published in:Energies (Basel) 2020-06, Vol.13 (11), p.2807
Main Authors: Haro-Larrode, Marta, Santos-Mugica, Maider, Etxegarai, Agurtzane, Eguia, Pablo
Format: Article
Language:English
Subjects:
Alternative energy sources
ancillary services
Codes
Compliance
Computer simulation
Control systems
coordinated frequency control
Design
Direct current
Frequency dependence
frequency response
Frequency response functions
grid code
Levels
Methodology
multi-terminal HVDC grids
Offshore operations
outer loop
Systems stability
Wind power
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13112807