Wind generator behaviour in a pay-as-bid curtailment market

A pay-as-bid curtailment market, where Wind Power Plants (WPPs) may offer prices to have their output reduced in the event of network balancing or stability constraints, is one approach towards the market integration of a high proportion of wind energy onto a power system. Such a market aims to procure curtailment at a cost close to the marginal value of the electricity plus renewable subsidies and incentives, reducing risks for WPPs while minimising costs to the Independent System Operator (ISO). Through the use of game theory and market modelling, a key set of bidding strategies are identified that may evolve within such a market, which may act in opposition to the goals of the ISO. These are applied to a variety of network conditions in order to determine their likely impact and the resulting bidding signals provided to market participants. Bidding behaviours and market fluidity may also be affected by factors particular to wind power plants. Through analysis of both ex ante and ex post case studies, the existence of these behaviours is demonstrated, illustrating that a pay-as-bid curtailment market may not be efficient at price discovery in practice

Releasing wind farm equity via post-construction yield analysis

During pre-construction yield analysis, an extrapolated site wind regime is applied to a site model in order to produce estimated yield figures. However, once the site has been operational, many of the uncertainties involved in this modelling, such as electrical losses, wake losses, turbulence and power performance, may be resolved into measured operational parameters. This means that off-site anemometry may be directly related to power production on the site. In a post-construction yield analysis, the pre-construction figures are refined using actual operational data. This allows: a) The initial yield report figures to be reassessed in the light of wind farm performance, and b) The uncertainties associated with annual yield figures to be reduced and understood more fully. This increasing reduction in uncertainty allows improvements in financial modelling to take place over the operational life of the wind farm, releasing equity from the wind farm investmen

Anatomy of an organizational change effort at the Lewis Research Center

By 1979, after a long decline following the end of the Apollo program, the Lewis Research Center found its very existence endangered because it was not doing the kind of research that could attract funding at the time. New management under Andrew J. Stofan applied a program of strategic planning, participative management, and consensus decision making. A corporate-cultural change was effected which enabled Lewis to commit itself to four fundable research and development projects. Morale-building and training programs which were essential to this change are described

Barrows in the cultural imagination of later Medieval England

When history has gone beyond memory, and where there is little or no written record, then objects in the landscape are used and interpreted in order both to understand the past, and to tie the past to the present. This thesis explores the places of barrows in the cultural imagination of later medieval England, following the interdisciplinary approaches of Sarah Semple (Perceptions of the Prehistoric in Anglo-Saxon England: Religion, Ritual, and Rulership in the Landscape, 2013) and Anwen Cooper (Other Types of Meaning: Relationships between Round Barrows and Landscapes from 1500 BC-AC 1086, 2016). This thesis identifies and examines a range of historical sources to explore an area of research which has not previously been studied in depth. Whilst it is the case that barrows appear in texts relatively infrequently during the later medieval period, this thesis argues that these references were included specifically because they had significance and meaning both for the writer and the intended audience. Those writers who included barrows in their work anticipated that their intended audience would be able to recognise them, and to be aware of their significance. The intended audience for many of the texts discussed in this thesis was primarily aristocratic elites and the clergy, and therefore the texts speak to their interests and concerns, with barrows often being connected to themes of exemplary kingship. The past is also used to talk about the present; here barrows become symbols of the past, both ‘historic’, and at times mythical, having links to the supernatural. They act as focal points through which wider, contemporary issues can be explored, thus allowing authors access to the past and to a landscape onto which they can project the concerns of the present, and therefore talk about them more freel

Commercial integration of storage and responsive demand to facilitate wind energy on the Shetland Islands

The Northern Isles New Energy Solutions (NINES) project seeks to implement Active Network Management (ANM) on the Shetland Islands in a manner which reduces customers’ energy consumption, lowers peak demand and facilitates an increase in the proportion of electricity from wind, in order to take advantage of the unique wind resource of the islands. This presentation focuses on the commercial frameworks and trading arrangements necessary to permit additional wind capacity onto the islanded network through the active use of storage and responsive demand technologies. The network is modelled using a Dynamic Optimal Power Flow (DOPF) framework, which allows the unit scheduling of different combinations of generation, storage and demand to be optimised according to different optimisation goals. This is used as a foundation to explore the value of wind energy and storage in meeting the long-term goals of the network, the forms of trading and markets which may be used to contract services, and the potential for responsive demand to facilitate different forms of connection agreements and curtailment strategies for new wind farms. In modelling the Shetland network using Dynamic Optimal Power Flow (DOPF), the optimum unit commitment schedule is determined across a daily horizon for different network topologies, including variable levels of wind generation, storage and demand-side response - primarily storage heaters and water tanks controllable by the Distribution System Operator via Active Network Management. This informs the level of wind generation which may be accepted onto the network, and allows the creation and testing of commercial agreements both for wind generators keen to utilise the unique resource of the islands, as well as allowing third-party operation of storage, and reducing the peak energy demand of domestic consumers. This allows a greater level of demand to be supplied by non-thermal sources through the time-shifting of demand against the availability of the wind resource. Support of the grid through reserve and response is considered in the context of maintaining system stability, with the aim of procuring services through third-party contractual arrangements. Data collected from the operational history of the islands and technology trials demonstrate the feasibility of these approaches and their potential applicability to other constrained distribution networks with the potential for high levels of wind generation. The data from trials of domestic storage equipment and modelling of wind curtailment demonstrate quantitatively the ways in which commercial integration of modern storage and responsive demand can be used to increase the utilisation of wind energy on islanded networks, which may often have increased renewable resources but limited grid capacity. It is shown that there are a number of trading and connection agreements which can be used to contract for generation and ancillary services to meet these goals

Session B-5: Planetary Science and the NGSS

The goal of this session is to use what we understand about other planets and moons in our Solar System in order to get a better understanding of the Earth

Session B-1: Model building in Planetary Science and the NGSS

In this session I will guide teachers through the steps my students take in Planetary Science to develop a conceptual model of how planetary interiors work. Teachers will then create concept maps from their conceptual models, and then use their models and maps to understand planetary systems other than Earth

The Interaction Between Nurses and Patients' Relatives

During the course of a span of duty the nurse in hospital has to relate to a number of different people including other occupational groups, other nurses, patients and patients' relatives. The present study has been designed to examine one of these role-relationships, that between the nurse and the patients' relatives

Exploring Other Worlds: a Project in Planetary Science Class

Planetary science is a highly interdisciplinary field, it often requires knowledge of physics, chemistry, geology, biology, and atmospheric science. In addition much of what we know of planets and moons come from missions that are exemplars of good engineering practices. In order to give my students a very basic understanding of what a planetary scientist does, they do a project that simulates the process of designing, proposing, operating, and analyzing the data from a robotic mission to a planet or moon. In this workshop, participants will work in groups to go through the steps of this project