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Publications

Publications by Nuno José Gil

2008

Exploiting Automated Demand Response, Generation and Storage Capabilities for Hierarchical Frequency Control in Islanded Multi-Microgrids

Authors
Nuno Gil; Peças Lopes

Publication
Proceedings of PSCC2008 - 16th Power Systems Computation Conference, Glasgow, Scotland

Abstract
This paper presents a hierarchical approach to deal with the problem of frequency control in a medium voltage network comprising several microgrids and distributed generation sources operated in islanded mode. The role of automated load control and the possible contribution of local storage devices and grid-connected electrical or hybrid vehicles with onboard storage systems are some of the main developments assessed in this paper. The hierarchical approach described here proves to be capable of dealing with large numbers of distributed microsources when performing tasks related to coordinated frequency control.

2011

Hierarchical Frequency Control in Multi-MicroGrids: The Participation of Electric Vehicles

Authors
Nuno Gil; Diego Issicaba; Pedro Rocha Almeida; João Peças Lopes

Publication
CIGRÉ SYMPOSIUM - Cigrè International Symposium , Bologna, Italy

Abstract
The operation and planning of Low Voltage (LV) and Medium Voltage (MV) distribution networks have been changing over the last decade. Due to the presence of Distributed Generation (DG) and microgeneration, an active role has been attributed to these networks in grid operation. For this accomplishment, different conceptual approaches were developed. In [1], a hierarchical control structure was defined, considering that DG units, onload tap changer transformers, static var compensators and loads can be controlled by a hierarchically higher entity, the Central Autonomous Management Unit (CAMC). The CAMC is also responsible for the management of specific LV networks, the MicroGrids (MG), which in turn have autonomy to manage their loads and microgeneration units through an entity called MicroGrid Central Controller (MGCC). A MV grid with these characteristics plus some storage devices would then be called a Multi-MicroGrid (MMG), being, among other functionalities, able to operate isolated from the upstream network. The recent appearance of a new type of load to the system, the Electric Vehicle (EV), expected to be largely integrated in the electricity grids in the upcoming years, has a great potential for adding controllability to the MMG. In this paper, an EV control droop (see [2]) will be introduced to improve the MMG performance when EVs operate as active elements. EV controllers are then able to receive setpoints from the CAMC and also actively update the droop settings in

2007

Hierarchical Frequency Control Scheme for Islanded Multi-Microgrids Operation

Authors
Nuno Gil; Peças Lopes

Publication
Proceedings of PowerTech2007 - IEEE Lausanne Power Tech 2007, Lausanne, Switzerland

Abstract
This paper presents a new hierarchical approach to deal with the problem of controlling frequency and active power generation of a medium voltage network comprising several microgrids and distributed generation sources operated in islanded mode. The hierarchical approach described here should be cost effec-tive and capable of dealing with large numbers of distributed microsources and performing tasks related to coordinated fre-quency control.

2010

Identificação de condições de Operação em Modo Isolado e Procedimentos de Controlo de Emergência para Multi-micro-redes

Authors
Nuno José Gil

Publication
PhD Thesisvol.0

Abstract

2011

Impact of Multi-Microgrid Communication Systems in Islanded Operation

Authors
David Emanuel Rua; Luís Filipe Pereira; Nuno José Gil; João Peças Lopes

Publication
ISGT 2011 - IEEE PES ISGT 2011 Europe , Manchester, UK

Abstract

2010

Islanding Operation of Active Distribution Grids using an Agent-based Architecture

Authors
Diego Issicaba; Nuno José Gil; João Peças Lopes

Publication
ISGT - IEEE PES Conference on Innovative Smart Grid Technologies Europe, Gothenburg, Sweden

Abstract

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