Object oriented simulation of hybrid renewable energy systems focused on supervisor control

EFTA 2009

The Sustainability of `Sustainable´ Energy Use: Historical Evidence on the Relationship between Economic Growth and Renewable Energy

20 p.

The Green Paradox and Learning-by-doing in the Renewable Energy Sector

21 p.

Essays on the effect of renewable energy production in the spanish electricity market.

172

Performance of an Ocean Energy Conversion System with DFIG Sensorless Control

The 2009/28/EC Directive requires Member States of the European Union to adopt a National Action Plan for Renewable Energy. In this context, the Basque Energy Board, EVE, is committed to research activities such as the Mutriku Oscillating Water Column plant, OWC. This is an experimental facility whose concept consists of a turbine located in a pneumatic energy collection chamber and a doubly fed induction generator that converts energy extracted by the turbine into a form that can be returned to the network. The turbo-generator control requires a precise knowledge of system parameters and of the rotor angular velocity in particular. Thus, to remove the rotor speed sensor implies a simplification of the hardware that is always convenient in rough working conditions. In this particular case, a Luenberger based observer is considered and the effectiveness of the proposed control is shown by numerical simulations. Comparing these results with those obtained using a traditional speed sensor, it is shown that the proposed solution provides better performance since it increases power extraction in the sense that it allows a more reliable and robust performance of the plant, which is even more relevant in a hostile environment as the ocean.

Agent based modeling of energy networks

Attempts to model any present or future power grid face a huge challenge because a power grid is a complex system, with feedback and multi-agent behaviors, integrated by generation, distribution, storage and consumption systems, using various control and automation computing systems to manage electricity flows. Our approach to modeling is to build upon an established model of the low voltage electricity network which is tested and proven, by extending it to a generalized energy model. But, in order to address the crucial issues of energy efficiency, additional processes like energy conversion and storage, and further energy carriers, such as gas, heat, etc., besides the traditional electrical one, must be considered. Therefore a more powerful model, provided with enhanced nodes or conversion points, able to deal with multidimensional flows, is being required. This article addresses the issue of modeling a local multi-carrier energy network. This problem can be considered as an extension of modeling a low voltage distribution network located at some urban or rural geographic area. But instead of using an external power flow analysis package to do the power flow calculations, as used in electric networks, in this work we integrate a multiagent algorithm to perform the task, in a concurrent way to the other simulation tasks, and not only for the electric fluid but also for a number of additional energy carriers. As the model is mainly focused in system operation, generation and load models are not developed.

An austerity-driven energy reform

In July 2013, the government approved a major overhaul of the Spanish electricity sector to correct existing imbalances that have led to an exponential increase of regulated electricity costs and a huge tariff deficit. The reform addresses the problem of financial sustainability of the sector, severely affected by weak demand and overcapacity. Previous regulation introduced in 2012 and early 2013, also aimed at restoring financial stability of the sector, failed to correct the tariff shortfall and new regulatory measures were needed to reduce the 4.5 billion euros forecasted deficit for 2013. The frequent change of the rules of the game in the sector has created regulatory uncertainty, more so as it is not clear that the present reform will be sufficient to eliminate the deficit. Moreover, the government has left the door open to new regulation that would deal with the price formation system. In general, short run financial criteria have prevailed, while efficiency principles and a long run perspective have little weight in the reform.

Compliance verification methodology for renewable generation integration. Application to island power grids

261 p.

Understanding Tariff Deficit and its Challenges

Regulators and market participants have become increasingly concerned about the Spanish electricity tariff deficit due to its size and the difficulties to control its growth. The deficit can be traced to inefficiencies in market organization and solutions should be designed to mitigate those inefficiencies. Tariff deficits have allowed for the transfer of part of the present costs of electricity services to future consumers, but this situation has reached a limit and a deep revision of regulation in this market cannot be postponed. In general, solutions that interfere with market prices and signals are not appropriate.

Multi-agent modelling for the simulation of a simple smart microgrid

The smart grid is a highly complex system that is being formed from the traditional power grid, adding new and sophisticated communication and control devices. This will enable integrating new elements for distributed power generation and also achieving an increasingly automated operation so for actions of the utilities as for customers. In order to model such systems a bottom-up method is followed, using only a few basic elements which are structured into two layers: a physical layer for the electrical power transmission, and one logical layer for element communication. A simple case study is presented to analyse the possibilities of simulation. It shows a microgrid model with dynamic load management and an integrated approach that can process both electrical and communication flows.

Modeling smart grids as complex systems through the implementation of intelligent hubs

ICINCO 2010

A complex systems modelling approach for decentralized simulation of electrical microgrids

ICECCS 2010

Complete agent based simulation of mini-grids

EuroPES 2009

Is the current EU climate instrument mix adequate?

4 p.

Proyecto de instalación eléctrica para el abastecimiento de una vivienda mediante energías renovables

El proyecto se centra en abastecer la demanda eléctrica del Centro Canino Berquier (Añorbe – Zona Media de Navarra), que cuenta una residencia canina, una consulta veterinaria y una vivienda, mediante un sistema aislado de la red y el uso de energías renovables. El abastecimiento de energía eléctrica mediante energías renovables, contará con un sistema de generación, almacenamiento y distribución, para garantizar un suministro en cantidad y calidad suficiente, del Centro Canino Berquier, Entre las opciones de abastecimiento doméstico renovable, tras un análisis preliminar de los recursos existentes en el emplazamiento del Centro Canino Berquier, se opta por una instalación híbrida eólica fotovoltaica autónoma, respaldada por un grupo electrógeno. Para el correcto dimensionado del mismo, se han seguido los siguientes pasos: - Estimación de los consumos del Centro Canino Berquier. - Caracterización del potencial eólico, evaluación y selección de la turbina eólica. - Radiación solar disponible, dimensionado, inclinación y orientación del generador FV. - Determinación de la capacidad de las baterías y del resto de componentes del sistema. - Cálculo del cableado y elementos de protección. - Esquema de conexiones. Si bien el proyecto, aparentemente, no aporta valor añadido en cuanto a la solución adoptada, (se ha empleado una tecnología técnicamente evaluada y económicamente viable), resulta recomendable como guía a la hora de afrontar proyectos de abastecimiento similares al nuestro.