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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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