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 superco...
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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 100 kJ/100 kW 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.
A stator earth fault protection scheme based on fault current is presented in this paper. It trips out the faulted generator only if the fault current following the breakdown channel exceeds the tolerance capacity of ...
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ISBN:
(纸本)9781479932559
A stator earth fault protection scheme based on fault current is presented in this paper. It trips out the faulted generator only if the fault current following the breakdown channel exceeds the tolerance capacity of the generator. Otherwise, it will just emit alarm signals. This protection scheme can avoid unnecessary trip-out of large generator, which influences the safe operation of power system, while ensuring the generator security. To achieve the scheme, methods of calculating fault current in real time are provided for three common generator neutral earthing methods basing on the zero-sequence equivalent circuits. An implementation scheme is given on the basis of the sub-harmonic injection protection device. The protection algorithm flow and protection criterion are discussed as well. Simulation results show the accuracy of the fault current calculation method and the validity of the protection scheme.
Monolayer graphene was deposited on a Si wafer substrate decorated with SiO2 nanoparticles (NPs) and then exposed to aryl radicals that were generated in situ from their diazonium precursors. Using micro-Raman mapping...
In the application of megawatt(MW) rated railway traction drives, as switching frequency is only several hundred hertz, the bandwidth of current loop is usually limited. Instead of instantaneous current feedback contr...
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The authors wish to retract the article because several figures (Figure 2 and parts of Figure 3) were reproduced from two previously published papers without pr
The authors wish to retract the article because several figures (Figure 2 and parts of Figure 3) were reproduced from two previously published papers without pr
The tunability,high power and flexible picoseconds-pulse time structure of terahertz(THz)radiation make the THz free-electron laser(FEL)a very attractive THz source of coherent *** paper focuses on the development and...
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The tunability,high power and flexible picoseconds-pulse time structure of terahertz(THz)radiation make the THz free-electron laser(FEL)a very attractive THz source of coherent *** paper focuses on the development and perspectives of THz radiation sources based on the *** principles of the low gain THz FEL oscillator,the SASE THz FEL amplifier and the supperradiant THz FEL are reviewed briefly,and the key technologies of THz FEL,such as injector,accelerator,undulator and optical cavity,are discussed,*** current status of and future prospects for THz radiation sources based on the FEL are emphasized in this *** research and development have shown bright future in free-electron laser(FEL)THz radiation *** potential applications can be carried out in the field of imaging,material research,biology medicine,communication,diagnostics and many others.
This paper discusses influences of using current transformer (CT) as feedback element in a cascade multilevel converter. First, a simplified transfer function model of CT is built by small signal test and the model pa...
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This paper proposes a new single-switch (SS) three-port converter (TPC) family. The attractive features of the proposed SS-TPCs are: (1) only one switch, two inductors and several diodes are required, the power stage ...
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ISBN:
(纸本)9781467343541
This paper proposes a new single-switch (SS) three-port converter (TPC) family. The attractive features of the proposed SS-TPCs are: (1) only one switch, two inductors and several diodes are required, the power stage is compact;(2) the duty cycle and switching frequency are utilized for energy management, the control circuit is simple;and (3) the redundant charging and discharging processes of the battery are alleviated because a direct current path from source to load is built, the lifespan of battery can be prolonged. The derivation law, circuit analysis, design process, energy management method and design example will be discussed in this paper. Analysis and experiments show that the proposed SS-TPC family can compromise several critical issues such as size, cost and lifespan of battery, and could be the potential candidates for low-power stand-alone renewable system.
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