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Xu W.,RMIT University | Zhang Y.,North China University of Technology | Xin Y.,Innopower Superconductor Cable
2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013 | Year: 2013

In this paper, a new bridge-type chopper having power electronic switches is proposed for low-voltage superconducting magnetic energy storage (SMES) applications. The energy charge and discharge characteristics of a high temperature superconducting (HTS) SMES device, including transient current through the HTS coil, maximum discharge time duration for the load, effective energy utilization factor, are numerically studied using the circuit analysis and iterative calculation methods, and finally verified by measurements on the developed chopper device. One new theoretical modeling in corporation with a simple digital control method is presented. Experimental and numerical comparisons of the bridge-type and conventional choppers show that the new developed bridge-type chopper is favorable for long-time power compensation with very high operation efficiency in the low-voltage power applications. © 2013 IEEE.

Sun Y.,Tianjin University | Sun Y.,Innopower Superconductor Cable | Gong W.,Innopower Superconductor Cable | Wang J.,Innopower Superconductor Cable | And 3 more authors.
Cryogenics | Year: 2011

Saturated iron core superconducting fault current limiter (SIC-SFCL) is a promising fault current limiting device for high or extra-high voltage power grids. It has low impedance in normal power transmission and turns high impedance when a short-circuit takes place. The dc bias system of a saturated iron core superconducting fault current limiter plays a key role in realizing these features. Our 35 kV/90 MVA SIC-SFCL has been running live-grid since January 2008 at Puji substation in Yunnan, China. In this paper, the working principle of the dc bias system will be introduced and results of artificially imposed short-circuit tests will be provided, which verifies the validity of this system. © 2010 Elsevier Ltd. All rights reserved.

Jin J.-X.,University of Electronic Science and Technology of China | Chen X.-Y.,University of Electronic Science and Technology of China | Xin Y.,Innopower Superconductor Cable | Sun Y.-W.,Innopower Superconductor Cable
Proceedings of the 29th Chinese Control Conference, CCC'10 | Year: 2010

The energy charging, storing and discharging characteristics of magnetic energy storage (MES) system have been theoretically analyzed in the paper to develop an integrated MES mathematical model and to provide a method to link superconductivity to conventional power electronics for design and control of practical superconducting magnetic energy storage (SMES) systems. The developed model has been verified with practical simulation results.

Feng F.,Tsinghua University | Qu T.-M.,Tsinghua University | Gu C.,Tsinghua University | Xin Y.,Innopower Superconductor Cable | And 3 more authors.
Physica C: Superconductivity and its Applications | Year: 2011

A comparative study on the critical current performance of Bi-2223/Ag and YBCO coated conductor wires in low magnetic fields at liquid nitrogen temperature was carried out in this work. Five commercial high temperature superconductor wires from different manufacturers were collected. Their critical currents were measured in magnetic fields, ranging from 0 to 0.4 T. On contrary to the common conception, the Bi-2223/Ag samples had better performance than YBCO coated conductor samples in the magnetic fields parallel to the wide surface of superconducting wires within the experimental scope. We also found similar results by collecting the concerned datum from the published literatures to confirm our measurement results. At the present stage, this fact made that the Bi-2223/Ag wires might be the preferred choice for the applications with mainly low parallel fields involved, unless other considerations were prioritized. © 2011 Elsevier B.V. All rights reserved.

Xiao H.,Xian Jiaotong University | Qiu J.,Xian Jiaotong University | Wang S.,Xian Jiaotong University | Zhang Q.,Xian Jiaotong University | And 4 more authors.
IEEE Transactions on Magnetics | Year: 2011

Saturated Core High Temperature Superconducting (HTS) Fault Current Limiter (FCL) is one kind of limiters that can work effectively on short-circuit current limitation. In this paper, an equivalent circuit model depending on ac coil of HTS FCL is built for voltage distribution analysis under transient overvoltage. The equivalent circuit components, such as the capacitances and inductances, are calculated by using finite element method. The voltage distribution and oscillation analysis of ac coil may benefit to the insulation design of HTS FCL. © 2011 IEEE.

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