Browsing by Author "Fragale, Nunziatina"

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A hybrid agent-based secondary control for microgrids with increased fault-tolerance needs
(Institution of Engineering and Technology, 2018) Bintoudi, Angelina D.; Zyglakis, Lampros; Apostolos C. Tsolakis; Ioannidis, Dimosthenis; Al-Agtash S.; Martinez-Ramos, Jose L.; Onen, Ahmet; Azzopardi, Brian; Hadjidemetriou, Lenos; Martensen, Nis; Mounir, Khiat; Borg, Nicholas; Fragale, Nunziatina; Demoulias, Charis; Tzovaras, Dimitrios; 0000-0001-7086-5112; AGÜ, Mühendislik Fakültesi, Elektrik - Elektronik Mühendisliği Bölümü; Onen, Ahmet
This paper proposes a hybrid secondary control architecture for microgrids with AC-coupled droop-controlled units, based on both centralised and distributed control principles. The proposed secondary control is based on a multi-agent system (MAS), complemented by a microgrid centralised controller (MGCC). The system is able to adjust the droop curves dynamically in order to achieve voltage/frequency restoration as well as active/reactive power optimal allocation, based on the actual status of the controllable units, in particular, the state-of-charge of batteries and maximum power point of photovoltaics. The distributed nature of the agents is also fully exploited because the proposed framework retains operability even under fault on secondary MGCC. To evaluate the proposed framework, a scenario-based performance analysis has been tested over a simulated AC islanded microgrid, where communication from the MGCC is suddenly interrupted and the MAS is required to reconfigure in order to maintain the same control objectives. MATLAB/Simulink simulations have been realised using detailed physical form models for a small-scale microgrid, while the implementation of the MGCC and MAS is accomplished through Java Agent Development (JADE) framework.
Provision of Ancillary Services by a Smart Microgrid: An OPF Approach
(IEEE, 2018) Ramos, Jose L. Mart´ınez; Marcolini, Alejandro Marano; Lopez, Francisco P. Garc´ıa; Yravedra, Fernando Almagro; Onen, Ahmet; Yoldas, Yeliz; Khiat, Mounir; Ghomri, Leila; Fragale, Nunziatina; AGÜ, Mühendislik Fakültesi, Elektrik & Elektronik Mühendisliği Bölümü;
Ancillary services are all services required by the transmission (TSO) or distribution system operator (DSO) to maintain the integrity and stability of the transmission or distribution system as well as the power quality. Ancillary services that can be provided by a microgrid in grid-connected operation are frequency control support, voltage control support, congestion management, reduction of grid losses, and improvement of power quality. This paper presents the optimization problems used in the 3DMicroGrid project to determine the set-points of the different resources present in the microgrid to provide ancillary services to the power system in grid-connected operation: frequency control, voltage control and load curtailment. Results of the optimization of the pilot microgrid used in 3DMicroGrid are presented.