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.
A hybrid high temperature superconducting (HTS) linear synchronous propulsion system composed of a HTS linear synchronous motor (HTSLSM) in the middle and HTS magnetic suspension sub-systems on both sides has been proposed for a high-speed maglev train. Four carriages have been made up for the proposed maglev, and each carriage consists of four HTSLSM modules, which weight 45 tons. The maglev train...
The high temperature superconducting (HTS) cable has a wide application prospect in the future power grid because of its low loss, large capacity and friendly environment. Since without AC loss, the HTS DC cable has a longer cooling distance, and is more suitable for large capacity and long distance transmission. In the near future, with large-scale application of renewable energy, HTS DC cable is...
In this paper, a step-shaped field coil for large capacity superconducting motors application is investigated. As compared to a conventional rectangular cross-sectional shaped field coil, the step-shaped one can obtain the same air gap magnetic field intensity at a target point located at symmetry axis of field coil with reduced HTS tape consumption, and it also improves the critical current significantly...
HTS materials have potential applications in building HTS linear generators (HTSLG) which generate substantial advantages over conventional ones. A HTS linear synchronous generator (HTSLSGs) with HTS coils as a direct-drive wave energy converter (DWEC) is proposed and designed. The characteristics, structures, advantages of the HTSLSGs with HTS coils are analyzed and presented.
A conceptual cryogenic system for a 10 MW superconducting wind generator (SWG) is proposed. The proposed configuration eliminates the cryogenic rotary joints for transmitting the coolant, by which the reliability of the cryogenic system is improved. The design considerations and characteristic analysis under different conditions are conducted. The characteristic analysis provides a base for practical...
Based on the diode-based bridge type superconducting fault current limiters (SFCL) and the SCR-based bridge type SFCLs, a fully controlled hybrid bridge type SFCL without bias power supply and using fast-response power electronic switches IGBT is presented. By controlling the IGBTs, the current limiter circuit will have different state to limit fault currents. Compared to the traditional bridge type...
A HTS linear synchronous generator (HTSLSG) as a direct-drive wave energy converter (DWEC) has been proposed and designed, including structure design and operation mode. Advantages of the DWEC system using HTSLSG have also been verified.
A measurement instrument used for evaluating the superconducting properties of high temperature superconductors is proposed. Due to its special design, it can readily measure the properties with user-friend operation. Its flexible structure can also be adapted to different parameters measurement only by modifying the input initial parameters.
In this paper, a novel arrangement of field coil is proposed to decrease the additional iron loss caused by magnetic flux sag between the adjacent field coil sides with the same current direction. The comparison of iron loss between the novel and traditional arrangement of field coils at different conditions are discussed. The novel arrangement can decrease the iron loss from the analytic results.
Superconducting magnetic energy storage (SMES) becomes an enabling and emerging technology for power system application. The increasing demand for conventional energy sources and the green house effect are driving societies toward the development of electric vehicles (EVs) and alternate energy sources. This paper aims at investigating the effects of SMES on the smart grid incorporated with EVs.
The DC coil, AC coil, and the iron core are key components for a saturated iron core superconducting fault current limiter (SI-SFCL), which determine the device performance in fault current limiting as well as in normal power transmission. They are also have great impact on the size of the device, which are considerable factors influencing the utility's acceptance for the device. We have investigated...
Polyimide film has been used as an insulation material in the excitation winding of the high temperature superconducting motors. The existence of surface charge has a great influence on the breakdown characteristic. Direct fluorination is an effective method of polymers surface modification which can improve the electrical properties of original material. Therefore, it is necessary that the surface...
With the blooming deployment of renewable resources, more and more renewable energy are used in the power system, especially in the island smart grid. As the power generation is variable, the smart grid integrated renewable energy, such as photovoltaic (PV) or wind energy, may cause large system frequency fluctuations. In this paper, it studies the adaptive on-line frequency control in the island...
A single-sided high-temperature superconducting (HTS) linear synchronous motor (HTSLSM) with an HTS bulk magnet array as its secondary has been developed in our previous work. This work presents multiobjective design optimization for this HTSLSM for its broad industry applications. Moreover, a new topology is presented for the primary of this HTSLSM. The finite element model used for the performance...
High temperature superconducting (HTS) transformer is favored to reduce the energy loss by replacing normal conductor windings with superconducting windings. In order to reduce perpendicular field component around the HTS windings, the air gaps insider the windings are optimized and discussed to suit practical HTS transformer development.
High temperature superconducting (HTS) DC cable shows wide application prospect in the field of power transmissions. Compared with the conventional cables, a HTS cable shows no Joule heating during operation. Moreover, a DC superconducting power transmission system is more efficient contrast to an AC one, because it is free from AC loss. In near future, high current-carrying capacity and long distance...
Wind power production as an important renewable energy form has been developed substantially in recent decades. According to the increase in population density along with lack of land for installation onshore wind turbines, it leads to build wind farms with larger power production and more and more offshore wind farms developed. Therefore, having a few large-scale wind turbine generators (WTGs) instead...
Ethylene-propylene-diene terpolymer (EPDM) has been an important material in high voltage cable accessories which are connected to the superconducting power system. The dielectric properties are a great concern for the cable accessories. Doping of carbon black (CB) nanoparticles into EPDM has the effects of improving the insulating properties compared with undoped material. However, the effect of...
With the emergence of superconductor technology, high temperature superconducting (HTS) power devices are quickly being developed. Among them, the HTS cable is receiving considerable attention and application in power systems due to high capacity and low loss. To develop a HTS power cable system, the terminal technology is essential component. The HTS cable terminations must withstand a temperature...
The surface charge behavior of polypropylene film processed with liquid nitrogen was discussed in this paper. And it was focused on the comprehensive influences on the accumulation and decay of surface charge by applying DC and pulse voltage in sequence. The DC voltage is constant in both amplitude and stressing time, while the pulse voltage varies in amplitude from 0 kV to 3.5 kV. By measuring the...
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.