Statnett Sf | Date: 2017-03-29
A system for fastening an elongated composite member to a column 2 extending through an opening in the elongated composite member 1. The elongated composite member 1 comprises an opening formed by a first aperture having a first peripheral edge and a second aperture having a second peripheral edge through the composite wall member. A stress distribution member 31 having a conical section 38 extends between the first and second apertures. The invention also relates to a stress distribution member 31 of a composite material having a frustum-shaped section and a pylon for power lines.
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2011.7.2-1 | Award Amount: 19.44M | Year: 2012
6 Transmission System Operators (Belgium, France, Greece, Norway, Portugal and United Kingdom) and CORESO, a TSO coordination centre, together with 13 RTD performers propose a 4 year R&D project to develop and to validate an open interoperable toolbox which will bring support, by 2015, to future operations of the pan-European electricity transmission network, thus favouring increased coordination/harmonisation of operating procedures among network operators. Under the coordination of RTE, new concepts, methods and tools are developed to define security limits of the pan European system and to quantify the distance between an operating point and its nearest security boundary: this requires building its most likely description and developing a risk based security assessment accounting for its dynamic behaviour. The chain of resulting tools meets 3 overarching functional goals: i) to provide a risk based security assessment accounting for uncertainties around the most likely state, for probabilities of contingencies and for corresponding preventive and corrective actions. ii) to construct more realistic states of any system (taking into account its dynamics) over different time frames (real-time, intraday, day ahead, etc.). iii) to assess system security using time domain simulations (with less approximation than when implementing current standard methods/tools). The prototype tool box is validated according to use cases of increasing complexity: static risk-based security approach at control zone level, dynamic security margins accounting for new power technologies (HVDC, PST, FACTS), use of data coming from off-line security screening rules into on-line security assessment, and finally security maps at pan European level. Dissemination is based on periodic workshops for a permanent user group of network operators invited to use modules to meet their own control zone needs and the ones of present or future coordination centres.
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2013.7.2.1 | Award Amount: 10.86M | Year: 2013
Power system reliability management means to take decisions under increasing uncertainty (for instance, related to renewable generation). It aims to maintain power system performance at a desired level, while minimizing the socio-economic costs of keeping the power system at that performance level. Seven TSOs (Belgium, Bulgaria, Czech Republic, Denmark, France, Iceland, Norway), together with eleven RTD performers, propose the four year GARPUR research project. GARPUR designs, develops, assesses and evaluates new system reliability criteria and management while maximizing social welfare as they are progressively implemented over the next decades at a pan-European level. The new management methodologies encompass multiple business activities (system development, asset management, power system operation) that, in turn, ensure coherent decision-making at the respective time horizons. These methodologies also involve mathematical and computational models to predict the location, duration and amount of power supply interruptions. Five alternatives to improve reliability management of the pan-European power system are studied. After practical validation by the TSOs, these alternatives are analysed with the help of a quantification platform. Pilot tests of the new proposed reliability criteria are performed by individual TSOs or (when appropriate) a group of TSOs using this quantification platform, either in a given control zone or (where appropriate) throughout the pan-European system. Reliability criteria are compared and presented to the TSO community and regulatory authorities who establish the robustness of the results. Dissemination activities of the new reliability criteria are supported by a Reference Group of TSOs and address all the key electricity market stakeholders. An implementation roadmap is delivered for the deployment of the resulting technical and regulatory solutions to keep the pan-European system reliability at optimal socio-economic levels.
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2013.7.2.3 | Award Amount: 62.80M | Year: 2014
A group of eight Transmission System Operators with a generator company, manufacturers and research organisations, propose 5 demonstration projects to remove, in 4 years, several barriers which prevent large-scale penetration of renewable electricity production in the European transmission network. The full scale demonstrations led by industry aim at proving the benefits of novel technologies coupled with innovative system integration approaches: - A scaled down model of generators connected to a HVDC link is used within a new testing facility to validate novel control strategies to improve the interaction between HVDC links and wind turbine generators - The implementation of a full scale, hardware-in-the-loop test setup in collaboration with worldwide market leaders of HVDC-VSC technology explores the interactions of HVDC VSC multiterminal control systems to validate their interoperable operations - Strategies to upgrade existing HVDC interconnectors are validated with the help of innovative components, architecture and system integration performances, to ensure higher RES penetration and more efficient cross border exchanges. - Full scale experiments and pilot projects at real life scale of both installation and operation of AC overhead line repowering technologies are carried out to show how existing corridors can see their existing capacity increase within affordable investments. - The technical feasibility of integrating DC superconducting links within an AC meshed network (using MgB2 as the critical material) will be tested at prototype scale, thus proving that significant performance improvements have been reached to enable commercialization before 2030 The experimental results will be integrated into European impact analyses to show the scalability of the solutions: routes for replication will be provided with benefits for the pan European transmission network and the European electricity market as soon as 2018, in line with the SET plan objectives
Karimi-Ghartemani M.,Mississippi State University |
Mojiri M.,Isfahan University of Technology |
Safaee A.,Queen's University |
Walseth J.A.,Statnett SF |
And 3 more authors.
IEEE Transactions on Power Electronics | Year: 2013
This paper presents a new three-phase phase-locked loop (PLL) system that primarily estimates the phase angles, frequency, and magnitudes of the a three-phase input signal and also provides a filtered version of the input. It is then extended to the estimation of sequence components, their magnitudes, and phase angles. As compared with the conventional three-phase PLL, this method does not suffer from errors that are caused by signal unbalance and dc offset. It also provides estimate for several other variables which are not included in the conventional three-phase PLL. As compared with the method of using three independent single-phase enhanced PLLs, the proposed method offers a simpler structure. Moreover, the estimated frequency is more accurate and smoother because it uses the information from all three phases to estimate a single value for frequency. The paper also presents a modification that makes the PLL parameters independent from the input signal amplitude. The same modification is applicable to existing methods such as conventional three-phase PLL. Simulation and experimental results are presented to confirm desirable performance of the proposed method. © 2012 IEEE.
Agency: European Commission | Branch: FP7 | Program: MC-IAPP | Phase: FP7-PEOPLE-2009-IAPP | Award Amount: 1.09M | Year: 2010
Power transmission in Europe is entering a period of significant renewal and technological change because the electrical transmission grids face increases in new and variable energy sources, especially from large scale wind power generators. They therefore face future challenges of operation and control. Changes happening in the process industries will also have an impact on electrical supply because electric motors are taking over from traditional gas turbine drivers for large-scale process equipment such as compressors. On the other hand, new measurement and data acquisition methods such as phasor measurement units are allowing greatly improved observation of the transmission grid. In the light of these changes, there is a need for a new action to give Europe a significant lead in methods for enhanced power transmission system operation using emerging measurement technologies. The REAL-SMART proposal presents a balanced programme of applied R-and-D to address measurement-based monitoring and management of the high voltage transmission grid. It involves electrical transmission system operators, companies that supply technologies and components, and universities. The REAL-SMART consortium is interdisciplinary with experts in electrical power systems, modelling, instrumentation, signal analysis, equipment condition monitoring, and automation of oil & gas processes. The consortium will conduct research and undertake secondments to transfer experience and knowledge both ways between Academia and Industry. The project integrates in-depth understanding of the power system operational issues with analysis of state-of-the-art measurements and first-principles physical knowledge. It will invent and develop state-of-the-art tools that will be deployed by the transmission system operators, and will produce trained and experienced personnel. We aim to take a pivotal role in the creation of technology for intelligent operation of the wide-area transmission grids of the future
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2013.7.2.4 | Award Amount: 3.50M | Year: 2013
The basic assumption of the project is that the difficult public acceptance of Electric Power System (EPS) infrastructures are due to several reasons: i) the lack of trustworthiness in the relationship between Transmission System Operators (TSOs) and the stakeholders and general public; ii) the difficulty in comparing the new EPS infrastructures benefits, which are on a global, with the impacts , which are mostly local; iii) the perception of risks, threats and problems for the stakeholders, often neglected or scarcely recognized and understood by TSOs; iv) the lack of tools to facilitate the stakeholders and public participation to decision processes; v) the fragility or the complexity of the participatory processes, with the consequent very low effectiveness. The project idea, therefore, includes: 1. the analysis of the needs, concerns, wants and expectations of the stakeholders and general public 2. the development or adaptation of methodologies to assess impacts and benefits 3. the development of suitable processes for an effective communication and real participation of the stakeholders and general public 4. a series of case studies (taking into account geographical location, size of the infrastructure and stage of completion of the scheme), with a double aim: to give elements to the methodological activities and to allow a proper testing 5. a synthesis of the project results and a series of recommendations about the stakeholders and general public engagement 6. the dissemination of the project results and output The overarching goal of this proposal is to develop a methodology to manage the consultation in order to engage the stakeholders in the decision making process and to improve support of development of future grid infrastructure. Based on multidisciplinary approach, it is proposed to design and develop a European good practice guide lead by experts in the field of development of grid infrastructure, environmental and social acceptance issues.
Karimi-Ghartemani M.,Mississippi State University |
Walseth J.A.,Statnett SF
2012 11th International Conference on Information Science, Signal Processing and their Applications, ISSPA 2012 | Year: 2012
This paper presents a method for fault analysis in power system which uses the concept of enhanced phase-locked loop (EPLL). The proposed method uses an edge detection strategy to properly re-adjust the system state variables in order to achieve fast and smooth behavior during the initial periods after the inception and/or clearance of a fault. Digital implementation of the algorithm is discussed and simulation results obtained by applying the proposed method to experimental data are presented. © 2012 IEEE.
Seppanen J.M.,Aalto University |
Turunen J.,Statnett SF |
Koivisto M.,Aalto University |
Kishor N.,Aalto University |
Haarla L.C.,Aalto University
IEEE Transactions on Power Systems | Year: 2014
The analysis of electromechanical oscillatory modes offers essential information on the stability of power systems. This paper investigates the use of the natural excitation technique (NExT) in conjunction with the eigensystem realization algorithm (ERA) for the modal analysis of power systems. The NExT-ERA is a multivariate method utilizing data that are measured from several locations in the power grid. The method is capable of utilizing synchronously measured data from a wide area monitoring system (WAMS) as well as unsynchronized measurements, such as measurements of individual relays' recorders. The performance of the NExT-ERA method is analyzed by applying it to data generated with test systems. The method is also applied to actual measurements received from the Nordic power system. The results indicate that the frequencies and damping ratios of electromechanical oscillatory modes can be analyzed by using the NExT-ERA method. Thus, the method is a promising identification technique for wide-area monitoring of electromechanical oscillations. © 2014 IEEE.
News Article | September 26, 2016
Being delivered for a joint venture between the UK National Grid and Norwegian transmission system operator Statnett SF, the 1.4GW high voltage direct current (HVDC) interconnector will be the longest subsea line ever laid and a key artery in the construction of a future European supergrid. "This project's moving ahead is a clear signal that similar offshore projects in Europe have robust business cases and more credibility now that we are progressing towards an interconnected single market," Raul Gil, chief operating officer of Prysmian Powerlink, tells Recharge. "This is one of the largest, most challenging projects we have ever undertaken. The technology is already proven but the laying of such a long transmission line will be a first. We are confident of completing the NSL without major difficulties." The first length of the NSL line is in the "initial stage of manufacturing" at Prysmian's Arco Felice factory, adds Gil. Prysmian, which has previously laid the Skagerrak link between Norway and Denmark and the Montenegro-Italy interconnector, both of which use HVDC technology, will sail out its Giulio Verne vessel for NSL. The Giulio Verne, which has a 7,000-tonne capacity cable-table, will carry out the NSL job in eight trips, six of 135km and two of 65km, in water depths down to 200 metres. Commissioning of the HVDC system, which will connect converter stations in Kvilldal, Norway and Blyth, northeast England with twin armoured 525kV single-core cables, is scheduled to be complete by September 2021. The NSL, first discussed in the early 2000s, will play a central role in Europe's electricity network "reinforcement strategy", which aims to cut energy prices, providing clean energy and replace ageing power plants in the UK that are in line to be taken out of service.