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Amaratunga G.,Center for Advanced Photonics and Electronics
Proceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010 | Year: 2010

Current work on using nanostructured carbon surfaces in supercapacitors and batteries to enable enhanced performance is discussed. The emphasis is on solid electrolyte based batteries and supercapacitors which can be flexible and change form factor. This is a new concept for energy storage systems driven by the requirements of next generation mobile communication devices which will be designed to supplement regular battery power with power from harvested energy. It will be shown that a new class of flexible supercapacitors and batteries can be realised through use of carbon electrodes with enhanced nanostructure. © 2010 IEEE. Source


Zhu J.,China Electric Power Research Institute | Cheng Q.,Beijing Jiaotong University | Yang B.,Beijing Jiaotong University | Yuan W.,Center for Advanced Photonics and Electronics | And 2 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

A high temperature superconducting magnetic energy storage system (HT-SMES) is constructed using YBCO coated conductor and is integrated with a cryogenic system using sub-cooled LN2. A closed loop control algorithm, based on the digital signal processor (DSP) TMS320F2812, is proposed using the 2G HT-SMES to compensate dynamic voltage sag in power systems. A dynamic simulation experiment for compensation of instantaneous voltage sag is achieved. The experiment circuit is built using a signal conditioning circuit, a DSP controlling circuit, a power conversion circuit and a SMES unit. Analysis of the voltage waveforms before and after compensation validates that this SMES system is able to compensate instantaneous voltage sag. © 2010 IEEE. Source


Yuan W.,Center for Advanced Photonics and Electronics | Xian W.,Center for Advanced Photonics and Electronics | Ainslie M.,Center for Advanced Photonics and Electronics | Hong Z.,Center for Advanced Photonics and Electronics | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2010

This paper presents an SMES coil which has been designed and tested by University of Cambridge. The design gives the maximum stored energy in the coil which has been wound by a certain length of second-generation high-temperature superconductors (2G HTS). A numerical model has been developed to analyse the current density and magnetic field distribution and calculate the AC losses during the charge and discharge process of the coil. A cryostat has been designed and a test of the I-V curve measurement of the coil has been accomplished. In addition, the power electronics control of the SMES coil has been simulated. © 2006 IEEE. Source


Yuan W.,Center for Advanced Photonics and Electronics | Ainslie M.D.,Center for Advanced Photonics and Electronics | Xian W.,Center for Advanced Photonics and Electronics | Hong Z.,Center for Advanced Photonics and Electronics | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

This paper begins with introducing the winding techniques of two superconducting double-pancake coils wound using 2G coated conductors. These winding techniques are able to guarantee a good performance for the superconducting coils. Then the coil critical currents were measured and compared with a simulation model. The results were consistent. Finally the coil AC losses were measured using an experimental circuit including a compensation coil. The simulation results are close to the experiment results. © 2010 IEEE. Source

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