Development of MVA Class HTS SMES System for Bridging Instantaneous Voltage Dips

Abstract

A SMES system of MVA class for bridging instantaneous voltage dips has been developed using Bi-2212 wire. The Bi-2212 wire has high-performance conductive characteristics that do not deteriorate at a low temperature in high magnetic fields beyond 10 T. These characteristics enable a compact design of a SMES system of the Bi-2212 wire. In addition, coils of the Bi-2212 wire can be adequately insulated due to a high temperature margin. Therefore, the SMES system designed by using the coils has advantages to enhance dielectric strength and output power of the system. In our previous study, a SMES system consisting of 4 unit coils was constructed and the various properties were examined. Up to the present, the total 18 unit coils were stacked to make a coil system (outer diameter: 700 mm, height: 554 mm, stored energy: 984 kJ) and installed into a SMES system of 1 MVA for bridging instantaneous voltage dips. Also, the cooling system of the HTS SMES has been improved. The characteristics of the conduction cooled HTS coils of 1 MJ class were investigated in the operations of 1 MVA SMES system for bridging instantaneous voltage dips. Thermal reliability was verified during each operations of exciting, standby, bridging and current damping. Moreover, the repetitive bridging operations even worked out every 5 minutes. Advantages of the conduction cooled HTS coils for SMES were verified.

Over 15 MA/cm2 of critical current density in 4.8 µm thick, Zr-doped (Gd,Y)Ba2Cu3Ox superconductor at 30 K, 3T

“…Many electric power applications like generators, motors, high energy particle accelerators, superconducting magnetic energy storage, magnetic resonance imaging and high field magnets require high engineering current densities in REBCO tapes at high magnetic fields of (2–30)T in a temperature range of (4.2–50) K 2,3 . Most of the listed applications would benefit from increase in power density, which can be achieved by increasing the engineering current density ( J e ).…”

Dynamic performance analysis of SMES for sensitive load voltage sag compensation

“…As compared to other conventional energy storage devices, superconducting magnetic energy storage (SMES) device has the outstanding characteristics of high power density and quick response speed. Recently lots of the SMES devices have been developed and applied in compensating voltage sags for various sensitive loads [2][3][4]. This paper attempts to analyze and quantify the dynamic performance of SMES for sensitive load voltage compensation under different sag depths and energy storage capacities.…”

Properties of a HTS magnet consisting of pancake windings by using the E-J method

“…A number of superconducting machines are being developed, such as, SMES (Superconducting Magnetic Energy Storage), NMR (Nuclear Magnetic Resonance), MRI (Magnetic Resonance Image) and magnetic separator [1][2][3]. Superconducting magnets are used for most of the superconducting machines.…”