The Experts below are selected from a list of 221067 Experts worldwide ranked by ideXlab platform
G W Ault - One of the best experts on this subject based on the ideXlab platform.
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a review and analysis of renewable energy curtailment schemes and principles of access transitioning towards business as usual
Energy Policy, 2014Co-Authors: Laura Kane, G W AultAbstract:In the last decade, the EU has driven forward the development and connection of renewable power sources across Europe. This has changed the way in which distribution Networks operate, moving from a passive system, to a more Active system where generation and demand are located closer together with system states being more complex and variable. Increased penetration of renewable generation into distribution Networks is presenting a number of challenges to Distribution Network Operators (DNOs) including the provision of Network access in capacity constrained Networks. The introduction of Active Network Management (ANM) is enabling an increase in renewable generation connections through enhanced Network access in otherwise ‘full’ Networks.
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dynamic optimal power flow for Active distribution Networks
IEEE Transactions on Power Systems, 2014Co-Authors: Simon Gill, Ivana Kockar, G W AultAbstract:Active Network Management is a philosophy for the operation of distribution Networks with high penetrations of renewable distributed generation. Technologies such as energy storage and flexible demand are now beginning to be included in Active Network Management (ANM) schemes. Optimizing the operation of these schemes requires consideration of inter-temporal linkages as well as Network power flow effects. Network effects are included in optimal power flow (OPF) solutions but this only optimizes for a single point in time. Dynamic optimal power flow (DOPF) is an extension of OPF to cover multiple time periods. This paper reviews the generic formulation of DOPF before developing a framework for modeling energy technologies with inter-temporal characteristics in an ANM context. The framework includes the optimization of nonfirm connected generation, principles of access for nonfirm generators, energy storage, and flexible demand. Two objectives based on maximizing export and revenue are developed and a case study is used to illustrate the technique. Results show that DOPF is able to successfully schedule these energy technologies. DOPF schedules energy storage and flexible demand to reduce generator curtailment significantly in the case study. Finally, the role of DOPF in analyzing ANM schemes is discussed with reference to extending the optimization framework to include other technologies and objectives.
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an assessment of principles of access for wind generation curtailment in Active Network management schemes
22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 2013Co-Authors: Laura Kane, G W Ault, Simon GillAbstract:The growth of wind generation embedded in distribution Networks is leading to the development and implementation of Active Network Management (ANM) strategies. These aim to increase the capacity of Distributed Generation (DG) that can connect to a Network. One such ANM strategy is generation curtailment where DG is given a non-firm connection under which the Network can instruct a generator to reduce its output under specified conditions. Currently in the UK the Orkney distribution Network operates a curtailment scheme for wind and other renewable generation [1]and a similar scheme is being developed for the Shetland Islands [2]. The main objective of this paper is to explore the options for Principles of Access (PoA) for curtailment of wind generation on distribution Networks which employ ANM. The PoA define the commercial rules by which a DG unit obtains access to the distribution Network and under an ANM curtailment scheme the PoA defines the curtailment instructions that would be sent to different DG units when Network constraints occur. The scenarios studied in this paper are based on the Orkney distribution Network.
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northern isles new energy solutions Active Network management stability limits
IEEE PES Innovative Smart Grid Technologies Europe, 2012Co-Authors: Michael Dolan, Colin Foote, Simon Gill, G W Ault, Damien Frame, Ivana Kockar, Olimpo Anayalara, Stuart Galloway, B Oneill, A SvalovsAbstract:The Northern Isles New Energy Solutions (NINES) project is addressing the current and future energy needs of the Shetland Isles by demonstrating the integration of low carbon energy sources using smart grid technology. In so doing, NINES will facilitate a major step towards a low carbon future for Shetland whilst leading and informing the wider international low carbon energy transition. The principal objective of the NINES project is to enable more renewable connections in a geographical area that is deemed to have the richest renewable energy resources in Europe. As such, the electrically islanded Shetland power Network will see significant changes in operation as district heating schemes, domestic space and water heating systems, energy storage systems and new wind connections are developed, deployed and integrated under an Active Network management system. This paper discusses the role of inter-dependent system models in providing essential inputs to Active Network management (ANM) design and configuration. Early results from model development and testing are presented with specific focus on the stability limits for the connection of additional renewable generation when operating in conjunction with frequency responsive demand.
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aura nms an autonomous regional Active Network management system for edf energy and sp energy Networks
Power and Energy Society General Meeting, 2010Co-Authors: E M Davidson, G W Ault, Michael Dolan, S D J McarthurAbstract:This paper discusses the authors' experience of developing an Active Network management system for use by two different distribution Network operators (DNOs) in the UK with differing Network management requirements. The paper describes the fundamental building blocks of AuRA-NMS (autonomous regional Active Network management system) and how their development was driven by the requirements of the partner DNOs. Practical experience of use of AI techniques to provide AuRA-NMS with its required intelligence and how that intelligence was distributed within the Network is discussed. The paper also discusses the different deployment approaches taken by the two DNOs.
Josep M Guerrero - One of the best experts on this subject based on the ideXlab platform.
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microgrids in Active Network management part ii system operation power quality and protection
Renewable & Sustainable Energy Reviews, 2014Co-Authors: Omid Palizban, Kimmo Kauhaniemi, Josep M GuerreroAbstract:Abstract The development of distribution Networks for participation in Active Network management (ANM) and smart grids is introduced using the microgrid concept. In recent years, this issue has been researched and implemented by many experts. The second part of this paper describes those developed operational concepts of microgrids that have an impact on their participation in ANM and in the requirements for achieving targets. Power quality is the most challenging task in microgrids, especially when the system switches from normal parallel operation (grid-connected mode) to island operation. Indeed, following planned or unplanned transitions to island mode, microgrids may develop instability. For this reason, the paper addresses the principles behind island-detection methods, black-start operation, fault management, and protection systems, along with a comprehensive review of power quality. Finally, island detection and the other topics are summarized with a flowchart and tables.
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microgrids in Active Network management part i hierarchical control energy storage virtual power plants and market participation
Renewable & Sustainable Energy Reviews, 2014Co-Authors: Omid Palizban, Kimmo Kauhaniemi, Josep M GuerreroAbstract:The microgrid concept has been closely investigated and implemented by numerous experts worldwide. The first part of this paper describes the principles of microgrid design, considering the operational concepts and requirements arising from participation in Active Network management. Over the last several years, efforts to standardize microgrids have been made, and it is in terms of these advances that the current paper proposes the application of IEC/ISO 62264 standards to microgrids and Virtual Power Plants, along with a comprehensive review of microgrids, including advanced control techniques, energy storage systems, and market participation in both island and grid-connection operation. Finally, control techniques and the principles of energy-storage systems are summarized in a comprehensive flowchart.
Omid Palizban - One of the best experts on this subject based on the ideXlab platform.
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microgrids in Active Network management part ii system operation power quality and protection
Renewable & Sustainable Energy Reviews, 2014Co-Authors: Omid Palizban, Kimmo Kauhaniemi, Josep M GuerreroAbstract:Abstract The development of distribution Networks for participation in Active Network management (ANM) and smart grids is introduced using the microgrid concept. In recent years, this issue has been researched and implemented by many experts. The second part of this paper describes those developed operational concepts of microgrids that have an impact on their participation in ANM and in the requirements for achieving targets. Power quality is the most challenging task in microgrids, especially when the system switches from normal parallel operation (grid-connected mode) to island operation. Indeed, following planned or unplanned transitions to island mode, microgrids may develop instability. For this reason, the paper addresses the principles behind island-detection methods, black-start operation, fault management, and protection systems, along with a comprehensive review of power quality. Finally, island detection and the other topics are summarized with a flowchart and tables.
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microgrids in Active Network management part i hierarchical control energy storage virtual power plants and market participation
Renewable & Sustainable Energy Reviews, 2014Co-Authors: Omid Palizban, Kimmo Kauhaniemi, Josep M GuerreroAbstract:The microgrid concept has been closely investigated and implemented by numerous experts worldwide. The first part of this paper describes the principles of microgrid design, considering the operational concepts and requirements arising from participation in Active Network management. Over the last several years, efforts to standardize microgrids have been made, and it is in terms of these advances that the current paper proposes the application of IEC/ISO 62264 standards to microgrids and Virtual Power Plants, along with a comprehensive review of microgrids, including advanced control techniques, energy storage systems, and market participation in both island and grid-connection operation. Finally, control techniques and the principles of energy-storage systems are summarized in a comprehensive flowchart.
Gareth Harrison - One of the best experts on this subject based on the ideXlab platform.
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smart decentralized control of dg for voltage and thermal constraint management
IEEE Transactions on Power Systems, 2012Co-Authors: Thipnatee Sansawatt, Luis F Ochoa, Gareth HarrisonAbstract:Active Network Management schemes are being developed to accommodate larger volumes of renewable generation within distribution Networks. Approaches typically manage only single technical constraints or are highly complex with extensive sensing and communications needs that bring cost, deployment, and operational risks. This work offers an alternative, decentralized approach for real-time management of local voltage and thermal constraints that avoids extensive sensing and communications. It controls generator Active and reActive power output to overcome voltage and thermal issues near the point of connection. Results from time-series analyses reveal its effectiveness in managing both constraints and allowing greater production. It represents a potentially effective and fast-to-deploy alternative to more complex, integrated solutions.
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Applying Active Network management schemes to an irish distribution Network for wind power maximisation
CIRED 2009 - The 20th International Conference and Exhibition on Electricity Distribution - Part 2, 2009Co-Authors: Luis Ochoa, Andrew Keane, Chris Dent, Gareth HarrisonAbstract:In order for governments worldwide to achieve their renewable targets, large amounts of new capacity, mainly wind power, need to be connected to power systems. A significant share is expected to be deployed at distribution levels. This paper is aimed at assessing the maximum wind power capacity a distribution Network is able to integrate based on a multi-period AC optimal power flow technique tailored to cater for Active Network management schemes such as coordinated voltage control, adaptive power factor control and energy curtailment. The methodology is applied to an Irish 38 kV circuit, considering the time-varying characteristics of demand and multiple wind generation profiles based on the coincident hours of different loading levels and wind power outputs over a year.
Delphine Arcizet - One of the best experts on this subject based on the ideXlab platform.
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temporal analysis of Active and passive transport in living cells
Physical Review Letters, 2008Co-Authors: Delphine Arcizet, Born Meier, Erich Sackmann, Joachim O Radler, Doris HeinrichAbstract:The cellular cytoskeleton is a fascinating Active Network, in which Brownian motion is intercepted by distinct phases of Active transport. We present a time-resolved statistical analysis dissecting phases of directed motion out of otherwise diffusive motion of tracer particles in living cells. The distribution of Active lifetimes is found to decay exponentially with a characteristic time tauA = 0.65 s. The velocity distribution of Active events exhibits several peaks, in agreement with a discrete number of motor proteins acting collectively.
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temporal analysis of Active and passive transport in living cells
Physical Review Letters, 2008Co-Authors: Delphine Arcizet, Born Meier, Erich Sackmann, Joachim O Radler, Doris HeinrichAbstract:The cellular cytoskeleton is a fascinating Active Network, in which Brownian motion is intercepted by distinct phases of Active transport. We present a time-resolved statistical analysis dissecting phases of directed motion out of otherwise diffusive motion of tracer particles in living cells. The distribution of Active lifetimes is found to decay exponentially with a characteristic time ${\overline{\ensuremath{\tau}}}_{A}=0.65\text{ }\text{ }\mathrm{s}$. The velocity distribution of Active events exhibits several peaks, in agreement with a discrete number of motor proteins acting collectively.
