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Jiao F.,Huazhong University of Science and Technology | Tang Y.,Huazhong University of Science and Technology | Dou J.,Huazhong University of Science and Technology | Sun Q.,Huazhong University of Science and Technology | And 5 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2012

The anisotropy of electromagnetic performance of high temperature superconducting (HTS) tapes is significant. The performance of BSCCO and YBCO, both of which have been employed in industry already, is varied when they stand different orientations of magnetic field. In HTS magnet design, adopting optimization can directly affect the performance of magnet and the amount of the tapes employed in the magnet, namely affects the economy of magnets. Considering both the measurement results of magnetic field characteristics of the HTS tapes in the critical current and the technical requirement of the diminutive superconductor magnetic energy system(SMES) which is laboratory scale, this paper puts forward the technical scheme of making hybrid HTS magnet which employs both BSCCO and YBCO, then fulfills the optimization design of the hybrid HTS magnet by means of finite element analysis, which considers the performance of energy storing as constraint condition and the economical efficiency as destination. This paper verifies the superiority of employing two types of tape to make a HTS magnet. © 2002-2011 IEEE.


Xu Y.,Huazhong University of Science and Technology | Tang Y.,Huazhong University of Science and Technology | Ren L.,Huazhong University of Science and Technology | Dai Q.,Huazhong University of Science and Technology | And 7 more authors.
Cryogenics | Year: 2015

The current flowing through a SMES is subjected to variations at a rate ranging from 0.1 A/s to 300 A/s under the influence of the power grid. The duration of power exchange varies from milliseconds to minutes, even to hours. When operating, the impact of AC losses in HTS tapes on the cryogenic cooling system should be considered. If the cryogenic cooling system fails to take away the generated heat effectively, this may lead to the temperature rise of the magnet and its possible damage. Therefore, it is essential to evaluate the technical and economical characteristic of cryogenic cooling system. Thus, a 5 MJ SMES model is built to calculate the temperature characteristic. A new factor δ is defined to assess the technological and economical validity of the chosen cryogenic scheme. The suitable capacity of the cryogenic cooling system is evaluated for different applications. The effect of the operating temperature on the technical and economical factor is also discussed. © 2015 Elsevier Ltd.


Su L.S.,Huazhong University of Science and Technology | He Q.,Electrical Testing and Research Institute of HBEPC | Shi J.,Huazhong University of Science and Technology | Ren L.,Huazhong University of Science and Technology | And 3 more authors.
Applied Mechanics and Materials | Year: 2014

Due to the high JC of the superconductor, the volume and the weight of the generator can be significantly reduced if the superconducting coils are used. This paper has designed a 40-pole racetrack excitation winding for the 12MW offshore wind turbines generator. The excitation winding are wound by Nb-Ti superconductor, running at the temperature of 4.2K. In order to ensure the stability and reliability of the magnetic field, some optimizers for the design of the excitation winding are adopted. As a result, the fundamental magnetic field at the air-gap center of the armature winding could reach 2.1T, thereby the 12MW power generation could be achieved. © (2014) Trans Tech Publications, Switzerland.


Ge T.,Huazhong University of Science and Technology | Ren L.,Huazhong University of Science and Technology | He Q.,Electrical Testing and Research Institute of HBEPC | Jiao F.,Huazhong University of Science and Technology | And 3 more authors.
Physics Procedia | Year: 2013

In application of Superconducting magnetic energy storage device (SMES), current lead represents a key development component. This paper will focus on parameters and structure design of hybrid high-temperature superconductor (HTS) current lead in a SMES with 100kJ/100kW class. Based on the theoretical analysis, finite element simulation (FEA) has been used. It studies the thermal influence of variable cross-sectional area, HTS material and the connection between current lead and cryocooler. Some improvements have been proposed to reduce heat losses. At the end of this paper, a whole procedure about hybrid current lead design is given. © 2013 The Authors.


Jiao F.,Huazhong University of Science and Technology | Tang Y.,Huazhong University of Science and Technology | Jin T.,Electrical Testing and Research Institute of HBEPC | Zhou S.,Electrical Testing and Research Institute of HBEPC | And 5 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

Owing to the application of high-temperature superconductor (HTS) tapes, superconducting magnetic energy storage (SMES) magnets can be economical to run at temperatures around 20 K. The conduction-cooled SMES magnet has become a reality with the rapid development of cryocooler technology. In China, a 150 kJ/100 kW conduction-cooled SMES employed for power quality is now being developed by Huazhong University of Science and Technology (HUST) and Hubei Electric Power Company (HBEPC). In electromagnetic design, a hybrid structure that uses two kinds of HTS tapes is employed to increase the critical current, Ic, of the SMES magnet. This paper presents an electromagnetic and thermal design of the conduction-cooling system for the magnet. The relationship between Ic and temperature is analyzed, and the target parameters of the conduction cooling system are finalized. The design scheme of the cooling system is developed by analyzing thermal conductivity characteristics of HTS double-pancakes, thermal loads, thermal resistance, and cooling demands. Finite element analysis results show that the design scheme meets the requirements well in static conditions. © 2002-2011 IEEE.


Ren L.,Huazhong University of Science and Technology | Tang Y.,Huazhong University of Science and Technology | Shi J.,Huazhong University of Science and Technology | Dou J.,Huazhong University of Science and Technology | And 2 more authors.
Physica C: Superconductivity and its Applications | Year: 2013

Huazhong University of Science and Technology is planning to establish a hybrid solar-wind generation dynamic simulation laboratory. Energy storage technologies will be vital to this system for load leveling, power quality control and stable output. In this paper, the technical feasibility of energy storage technologies for renewable intermittent sources like wind and solar generation is analyzed. Furthermore, the different combination modes of energy storage technologies are proposed. The involved energy storage technologies include superconducting magnetic energy storage systems (SMESs), flywheels (FWs), electrochemical super-capacitors (SCs) and redox flow batteries (RFBs). Based on that, the economic analysis of hybrid energy storage technologies is conducted.

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