The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, a generic load model is presented, suitable for dynamic simulations over a wide range of loading conditions. The proposed model is based on the well-established exponential recovery load model. Contrary to the conventional first-order form of this model, the proposed formulation employs variable-order transfer functions, enabling the accurate simulation of high-order load dynamics....
Iceland is rich with geothermal and hydro energy resources in addition to unique natural conditions that attract a rapidly increasing number of tourists. All these factors will play an important role in the future economy and therefore a trade-off is needed to accommodate all aspects, that may in certain circumstances be considered mutually exclusive. The transport of electrical energy to load centers...
The adoption of electric vehicles (EVs) on a large scale can lead to significant social and economic benefits. The effort of promoting the use of EVs in road transportation is essential to meet the climate change targets and manage the ever unstable prices of perilously diminishing fossil fuels. On the other hand, there are still many uncertainties in the market regarding the acceptability of EVs...
Energy efficient lighting reduces the demand for electricity and its corresponding environmental impacts. In fact, lighting can represent a significant portion of energy and electricity consumption in public facilities. On the other hand, energy is the largest cost in owning and operating a typical lighting system. Finally, besides energy savings, energy efficient lighting often represents additional...
Thin thermochromic VO2 films grown by RF magnetron sputtering on various substrates (SnO2/glass, glass, Si) and with different deposition parameters, were studied in order to find the optimum conditions to produce thin film coatings with good thermochromic and thermoelectric characteristics as required for power line protection / switching applications. Regarding the electrical/electronic applications...
Transient overvoltages are inevitable phenomena in power systems. They occur in high voltage direct current systems for much the same as the reasons they happen in high voltage alternating current systems and could be of either internal or external origin. Moreover, the switching operation of the power electronic valves in HVDC converters add to these transient sources. The effects of such transient...
In order to identify the type and the location of fault, partial discharge diagnosis is a valuable method. Until now, a majority of the evaluation criteria used for partial discharge diagnosis is based on investigations performed at AC voltage. The increasing importance of DC transmission systems requires additional research concerning the behaviour of partial discharges at DC voltage. Especially...
Conductivity measurements are important within the area of insulating material characterization especially for HVDC transmission application. Within first investigations a derived novel test setup showed promising results regarding overall reproducibility with regard to the test specimen production and test configurations. Based on these first results, the setup is subjected to further enhancements...
Augmented Reality (AR) promises to revolution the maintenance field in general with relevant contributions to High-Voltage Systems. The value-added can came from several aspects, namely the increasing security and reducing time and costs of intervention. However there are some aspects related to AR state-of-the-art that do not permit yet to reach all of their potential, namely the necessity of use...
A photovoltaic power generation (PV) with a battery system is proposed to stabilize output power fluctuation from PV which depends on the whether condition for a power grid friendly. We propose a novel method for capacity designing of each device in the system. The optimum capacity of each device is estimated by the method which needs an annual amount of solar radiation data. A grid dependency (GD)...
This paper describes the development of a Master Programme in Electrical Power and Energy Systems at Teesside University. A brief review of learning theories and their application to the designs of the programme and its core modules is presented. The considerations of student diversity, learners needs, regulatory and licensing body guidelines and requirement, and the use of technology in assessment...
In restructured power systems, generation and commercialization activities became market activities, while transmission and distribution activities continue as regulated monopolies. As a result, the adequacy of transmission network should be evaluated independent of generation system. After introducing the constrained fuzzy power flow (CFPF) as a suitable tool to quantify the adequacy of transmission...
This paper presents an estimation of SF6 gas circuit breakers reliability in the transmission substations, considering the likely wear points identified in this device. The aging physically affects the equipment, which can make it less robust and more prone to failure. The equipment reliability can not be defined by its age, because its real condition depends on the wear and the on maintenance it...
The content of this paper will illustrate how, in the future, the power transmission system in Great Britain (GB) may be much “weaker” than it is at present, and will describe the potential impact that this could have on the voltage profiles during faults, and how the operation of backup protection system operation, if required, needs to be considered carefully to ensure system integrity in the future...
In this paper, we propose an optimal deployment of phasor measurement units (PMUs), devices that allow the measurements of voltage and current parameters in electrical power systems (EPS). We assume a geo-referenced scenery and candidate places for the location of PMU's on each system node. We consider an optimization model to minimize the number of PMU's in the electrical system under a percentage...
Materials successfully used for insulation purpose in AC transmission applications need to be investigated prior implementation in DC applications as material stresses change with transmission technology. The use of elastomeric insulating materials in HV applications has significantly increased over the last decades due to their valuable electrical and mechanical properties leading to a broad range...
This paper aims to study the sector of biomass for energy in Portugal and to analyze the logistics costs associated to the exportation of its product to international markets. The growing concern on environmental impacts associated to fossil fuels contributed to enhance the importance of exploring more sustainable sources of alternative energies. This study enhances the potential of Portugal as a...
This paper presents a new fault detection technique for the diagnosis and localization of sub-module faults that are developed due to failures in switching devices inside Modular Multilevel Converters (MMC). Unlike other fault detection strategies that have been proposed in literature, the proposed fault detection technique does not need extra sensors or special power circuits as it depends on an...
The economics of power transmission requires operators to maximise the power through the network. Increasing knowledge of the impact of environmental factors on the current carrying capabilities of bare wire overhead lines is, therefore, important. Cost savings resulting from enhancing thermal transfer capabilities of transmission lines has motivated many utilities and power systems research centres...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.