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Cryogenic operation of power electronics provides many promising benefits for power conversions compared to their ambient-temperature counterparts. This paper presents a cryogenic boost-buck chopper integrated with cryogenic MOSFETs and high temperature superconducting (HTS) inductor. The results obtained show that the proposed boost-buck chopper has much higher operational efficiency than the conventional...
An inductive coupled power transfer (ICPT) scheme using high temperature superconducting (HTS) primary is presented, with its resonant current, transfer power and transfer efficiency characteristics calculated and discussed to identify this promising method to suit to develop practical low-frequency high-current ICPT devices and systems.
This paper presents a combined topology based on switched-capacitor converter. This topology can adjust output voltage. It eliminates inrush current and has high power density. Through parallel connection, the topology can output high power.
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.
This paper presents an intelligent test platform based on the Laboratory Virtual Instrument Engineering Workbench (LabVIEW). The proposed test platform mainly consists of a control module and a measurement module. The control module has the functions of current control, field control and temperature control. The measurement module has functions of current-voltage (I-V) measurement, temperature measurement...
A new digital prediction method by integrating circuit computation and linear estimation is proposed to achieve high-precision energy charge and discharge operations of a superconducting magnet. The principle and implementation processes are presented by considering a bridge-type chopper circuit. The simulation results verify the feasibility of the proposed method to achieve high-precision energy...
Applications of superconducting magnetic energy storage (SMES) technology have been progressed actively. Principal application schemes of sole SMES, hybrid energy storage system (HESS) consisting of small-scale SMES and other energy storage systems (ESSs), distributed SMES (DSMES), and distributed HESS (DHESS) have been presented and compared to develop smart energy managements. The results obtained...
This paper presents a VI based measurement and protection system for HTS device applications. The subsequent protection system has also been designed for the safe operation of HTS devices. The whole system has been tested and verified in superconducting magnetic energy storage (SMES) device. The results obtained prove that the VI measurement and protection system is easy to build and convenient to...
Currently a controlled SCR-based bridge type solid state fault current limiter (SSFCL) without a DC bias needs up to ten millisecond acting time to limit a fault current. An improved model of high temperature superconducting (HTS) FCL for a single phase system was proposed and analyzed in this paper. The proposed SSFCL system has a rectifying bridge connected with a HTS coil without a bias voltage...
This paper presents a controlled discharge method and its characteristics of a liquid nitrogen cooled high temperature superconducting (HTS) coil in a small-scale superconducting magnetic energy storage (SMES) device. The maximum discharge time duration for the load and effective energy utilization factor of the SMES device itself are theoretically studied using an iterative calculation method. The...
A new bridge-type chopper topology using MOSFETs is proposed and studied for superconducting magnetic energy storage (SMES) applications for use in low-voltage end-user sides. Both the bridge-type and conventional choppers are theoretically analyzed and experimentally compared. The dynamic energy exchange characteristics of SMES for solving the voltage swell and voltage sag problems are presented...
A simplified DC superconducting magnetic energy storage (SMES) model is presented in this paper. The theoretical modeling and application topology are introduced with a new digital time-delay control method proposed to achieve required energy exchange. The theoretical analysis and simulation results of the steady and dynamic power and exchange processes verify its feasibility for the design, optimization...
Successful performance of power grid needs to deal with the balancing of supply and demand in real time. In order to improve the quality of electric grid, a significant amount of power is necessary to be injected into the grid to solve the power system failures, such as voltage dip, reactive power rush and so on. These electric accidents can be well improved by energy storage systems (ESS), which...
The superconducting magnetic energy system (SMES) is introduced to form new hybrid energy storage systems (ESSs). The results obtained verify that the SMES-based hybrid ESSs suit to achieve ms-level fast power compensation and MW-level large power compensation in power system. The SMES-based hybrid ESSs can also reduce the total capital cost and improve the operation efficiency, which make the large-scale...
A new improved SMES chopper circuit is proposed for improving the energy storage and discharge efficiencies. The results obtained verify that the improved SMES circuit has longer energy storage time and lower control demand for the whole SMES system, and further results in longer energy discharge time with higher discharge efficiency.
Application development of high temperature superconductors (HTSs) has gone through from prospective enthusiasm to today's realistic realization since the HTS was discovered in 1986. Depending on the special characteristics of superconducting materials, with high power electronic devices, an experimental system for HTS coil has been developed. The experimental results obtained verify that the HTS...
The introduction of the superconducting technology to the resonant circuits results in various advantages, e.g., very large resonant current, very low operation energy loss, very low input power demand, thus makes low-frequency contactless power transfer (CPT) available. A novel CPT scheme is proposed, with the transfer power, transfer efficiency and electromagnetic field discussed to identify this...
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