Browsing NTNU Open by Author "Garcia Rosa, Paula Bastos"
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Comparative Evaluation of Virtual Inertia and Fast Frequency Reserve Provided by HVDC Terminals
Garcia Rosa, Paula Bastos; D'Arco, Salvatore; Suul, Jon Are Wold (Chapter, 2022)This paper compares the impact on power system frequency transients from virtual inertia and Fast Frequency Reserve (FFR) provided by HVDC converters. Specifically, frequency nadir, Rate-of-Change-of-Frequency (RoCoF), and ... -
Discussion on the mode mixing in wave energy control systems using the Hilbert-Huang transform
Garcia Rosa, Paula Bastos; Molinas Cabrera, Maria Marta; Fosso, Olav B (Peer reviewed; Journal article, 2019)A great improvement in the absorption of energy of a wave energy converter (WEC) is obtained with a time-varying power take-off (PTO) damping over a constant damping. In a passive control scheme based on the Hilbert-Huang ... -
Effect of non-ideal power take-off on the electric output power of a wave energy converter under suboptimal control
Pettersen, Martine F.; Fosso, Olav B; Garcia Rosa, Paula Bastos; Molinas Cabrera, Maria Marta (Chapter, 2021)This work investigates how the physical limitations and losses of an electric power takeoff (PTO) system affect the production of power for a wave energy converter (WEC) under suboptimal control strategies. The damping of ... -
Evaluation of wave-frequency motions extraction from dynamic positioning measurements using the empirical mode decomposition
Garcia Rosa, Paula Bastos; Brodtkorb, Astrid H.; Sørensen, Asgeir Johan; Molinas Cabrera, Maria Marta (Chapter, 2019)For dynamic positioning operations, high-frequency wave induced motions cause excessive control action, and consequently additional power consumption and wear of actuators in the propulsion system. Thus, such operations ... -
Frequency support by wave farms in low inertia power systems
Garcia Rosa, Paula Bastos; Fosso, Olav Bjarte (Peer reviewed; Journal article, 2023)New ancillary services and additional requirements for the grid integration of variable renewable energy (VRE) are being defined worldwide, in response to the technical challenges caused by increasing levels of VRE utilization ... -
A Hierarchical Wind Power Plant Supervisory Controller
Merz, Karl Otto; Kölle, Konstanze; Garcia Rosa, Paula Bastos; Chabaud, Valentin Bruno (SINTEF Rapport;, Research report, 2020) -
Placement of virtual inertia from HVDC terminals based on a frequency deviation index
Garcia Rosa, Paula Bastos; D'Arco, Salvatore; Suul, Jon Are Wold (Chapter, 2021)This paper presents an approach for assessing the most suitable locations to provide virtual inertia by HVDC converters. A frequency deviation index quantifying the maximum distance in Hz from each bus in the power system ... -
Stabilizing Control of an Unmanned Surface Vehicle Pushing a Floating Load
Rosario, Rafael Vida Castro; Cunha, Jose Paulo V.S.; Garcia Rosa, Paula Bastos (Peer reviewed; Journal article, 2020)In this paper, the automatic control of a single unmanned surface vehicle (USV) pushing a floating load is developed and theoretically analyzed. This represents a challenging control problem, since the manipulated load is ... -
Switching sequences for non-predictive declutching control of wave energy converters
Garcia Rosa, Paula Bastos; Fosso, Olav B; Molinas Cabrera, Maria Marta (Peer reviewed; Journal article, 2021)Aiming at improving the energy absorption from waves, a number of studies have considered declutching control - a phase-control method that consists of disengaging the power take-off (PTO) system from the oscillating body ... -
The impact of time-frequency estimation methods on the performance of wave energy converters under passive and reactive control
Garcia Rosa, Paula Bastos; Ringwood, John V.; Fosso, Olav B; Molinas Cabrera, Maria Marta (Journal article; Peer reviewed, 2018)A number of wave energy controllers tune the power take-off (PTO) system to the frequency of incident waves. Since real ocean waves are non-stationary by nature and not defined by a single frequency component, the PTO can ...