Results 1 - 10 of 248
Results 1 - 10 of 248. Search took: 0.025 seconds
|Sort by: date | relevance|
[en] SMES (Superconducting Magnetic Energy Storage) is an emerging technology offering tremendous potential benefits to the utility industry. San Diego Gas ampersand Electric (SDG ampersand E) and Bechtel are leading a team of companies and national laboratories working towards design and construction of the world's first demonstration facility for large, commercial SMES for enhancing transmission stability in the Southwestern United States
[en] The evaluation of investments in longer term research and development in emerging technologies, because of the nature of such subjects, must address inherent uncertainties. Most notably, future cash flow forecasts include substantial uncertainties. Conventional present value methodology, when applied to emerging technologies severely penalizes cash flow forecasts, and strategic investment opportunities are at risk of being neglected. Use of options valuation methodology adapted from the financial arena has been introduced as having applicability in such technology evaluations. Indeed, characteristics of superconducting magnetic energy storage technology suggest that it is a candidate for the use of options methodology when investment decisions are being contemplated
[en] The present study focuses on the relationship between the structural features and reversible shape memory effect (SME) including the related martensitic transformation (MT) in porous TiNi-based compounds fabricated by self-propagating high-temperature synthesis (SHS) at various ignition temperatures. Exploring the as-synthesized samples (S-1 and S-2) ignited at T 1 = 400 and T 2 = 600 °C, respectively, using a set of research instruments has revealed a key feature that modulates the resultant porous structure and SME parameters. Evidently, the one-step B2 ↔ B19′ MT in both samples is considered to be diffuse within a broad temperature gap, where the hysteresis loop width excels 70 degrees. The fine-porous S-1 indicated the well-developed macrostructure having a rough surface pattern of pore walls, whereas the high-porous S-2 did a dissimilar macrostructure having an even pore surface topology. From a phase-chemical point of view, the metal matrix of S-2 was found to be more homogeneous as compared to that of S-1, that in turn has led to the distinctive SME performance in terms of ε-T upon thermocycling. The extremely heterogeneous S-1 featured by more uniform pore shape and distribution has demonstrated the feasible strain behavior despite the fewer TiNi volume fraction and depressed MT was observed. Conversely, the SME performance for S-2 was shown to be impaired because of the discrepancy in the deformation behavior of small and large pore walls, even though the redundant TiNi volume fraction facilitated the MT. (paper)
[en] Superconducting magnetic energy storage (SMES) systems offering flexible, reliable, and fast acting power compensation are applicable to power systems to improve power system stabilities and to advance power qualities. The authors have summarized researches on SMES applications to power systems. Furthermore, various SMES applications to power systems have been described briefly and some crucial schematic diagrams and equations are given. In addition, this study presents valuable suggestions for future studies of SMES applications to power systems. Hence, this paper is helpful for co-researchers who want to know about the status of SMES applications to power systems. (topical review)
[en] This article presents the thermal model of a small scale superconducting magnetic energy storage system with the closed cycle helium cryocooler. The authors propose the use of contact-cooled coils with maintaining the possibility of the system reconfiguring. The model assumes the use of the second generation superconducting tapes to make the windings in the form of flat discs (pancakes). The paper presents results for a field model of the single pancake coil and the winding system consisting of several coils.
[en] The development of energy storage devices has been gaining in significance in the last few years. Advances made in this area of research and development might induce changes in the technical design concepts of electrical power supply systems, which eventually might lead to cost savings, among other things, in electricity supply. The technical requirements to be met by energy storage devices vary according to intended application. General goals of development work are: high loading/discharging efficiency; high energy and power output density; rapid controllability; favorable investment and operating costs. The paper addresses applications of interest to electric utility operators, as well as superconducting magnetic energy storage devices (SMES) for applications in a superconducting system environment. (orig.)
[de]Die Entwicklung von Energiespeichern gewann in den letzten Jahren stark an Bedeutung. Fortschitte koennten Aenderungen in den technischen Konzepten der elektrischen Energieversorgungssysteme bewirken, die nicht zuletzt auch eine kostenguenstigere Bereitstellung des Stromes zur Folge haben koennten. Die technischen Anforderungen unterscheiden sich je nach Einsatzgebiet. Generelle Entwicklungsziele sind - hoher Lade-/Entladewirkungsgrad; - grosse Energie- und Leistungsdichte; - schnelle Regelbarkeit; - guenstige Investitionen- und Betriebskosten. Im folgenden werden interessante Anwendungsmoeglichkeiten fuer Energiespeicher im EVU-Bereich naeher beleuchtet. Bei Anwendung der Supraleitung kommt als hier der Supraleitende Magnetische Energiespeicher (SMES) in Betracht. (orig.)
[en] This paper proposes a new optimal fuzzy logic-based-proportional-integral-derivative (FLPID) controller for load frequency control (LFC) including superconducting magnetic energy storage (SMES) units. Conventionally, the membership functions and control rules of fuzzy logic control are obtained by trial and error method or experiences of designers. To overcome this problem, the multiple tabu search (MTS) algorithm is applied to simultaneously tune PID gains, membership functions and control rules of FLPID controller to minimize frequency deviations of the system against load disturbances. The MTS algorithm introduces additional techniques for improvement of search process such as initialization, adaptive search, multiple searches, crossover and restarting process. Simulation results explicitly show that the performance of the optimum FLPID controller is superior to the conventional PID controller and the non-optimum FLPID controller in terms of the overshoot, settling time and robustness against variations of system parameters
[en] Electric energy is basic to heat and light our homes, to power our businesses and to transport people and goods. Powerful storage techniques like SMES, Flywheel, Super Capacitor, and Redox - Flow batteries are needed to increase the overall efficiency, stability and quality of electrical grids. High-Tc superconductors (HTS) possess superior physical and technical properties and can contribute in reducing the dissipation and losses in electric machines as motors and generators, in electric grids and transportation. The renewable energy sources as solar, wind energy and biomass will require energy storage systems even more as a key technology. We survey the physics and the technology status of superconducting flywheel energy storage (FESS) and magnetic energy storage systems (SMES) for their potential of large-scale commercialization. We report about a 10 kWh / 250 kW flywheel with magnetic stabilization of the rotor. The progress of HTS conductor science and technological engineering are basic for larger SMES developments. The performance of superconducting storage systems is reviewed and compared. We conclude that a broad range of intensive research and development in energy storage is urgently needed to produce technological options that can allow both climate stabilization and economic development.
[en] To maximize the benefits of globalization and increase their revenues, many small and medium-sized businesses (SMEs) would like to join a global supply chain. Meeting the quality requirements set by the multinationals that head these value chains is often tough for SMEs operating on shoestring budgets. The country’s nuclear agency, Nuklear Malaysia, is doing its bit to help. Thanks to the support of Nuklear Malaysia, Wonderful Ebeam Cable Sdn Bhd has become the first SME in the country to supply cables to Malaysia’s booming automotive sector. “By using radiation technology, we have been able to improve our product line and meet the requirements of the car manufacturers,” said Managing Director Ir Chan Chang Choy. “This has allowed me to grow my business and increase the workforce.”
[en] The different activities in the field of applied superconductivity carried out in Spain under the auspices of the MIDAS program are reported. Applications using both low- and high-temperature superconductors are considered. In the low temperature superconductors case, the design and construction of a 1 mega joule SMES (Superconducting Magnetic Energy Storage) unit, as well as the fabrication of voltage and resistance standards, are reviewed. Developments involving the design and fabrication of an inductive current fault limited and mono- and multi-filamentary wires and tapes using high-temperature superconductors are discussed. Finally, the prospects for the application of superconductivity technology to electric power systems for the electric utilities is considered. (author)