Superconducting Magnetic Energy Storage System Research Articles

Enhancing the utilization of photovoltaic power generation by superconductive magnetic energy storage

The authors demonstrate that a superconductive magnetic energy storage (SMES) system can enhance large-scale utilization of photovoltaic (PV) generation. Results show that power output from a SMES system can be used to smooth out PV power fluctuations so that the combined PV/SMES output is dispatchable and free from fluctuations. Power generated from PV arrays is shown to be fully utilized under different weather conditions, and PV penetration is increased to significant levels without adversely affecting the power system. Coupled with PV generation, a SMES system is even more effective in performing diurnal load leveling. A coordinated PV/SMES operation scheme is proposed, and its demonstration under different weather conditions is discussed. >

Effects of generator model and AVR on power system stabilization by superconducting magnet energy storage system

Electrical Engineering in JapanVolume 108, Issue 5 p. 75-82 Article Effects of generator model and AVR on power system stabilization by superconducting magnet energy storage system Yasuji Ohsawa, Yasuji Ohsawa Tsukuba UniversitySearch for more papers by this author Yasuji Ohsawa, Yasuji Ohsawa Tsukuba UniversitySearch for more papers by this author First published: September/October 1988 https://doi.org/10.1002/eej.4391080509Citations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume108, Issue5September/October 1988Pages 75-82 RelatedInformation

Charging and discharging characteristics of SMES with active filter in transmission system

For SMES (Superconducting Magnet Energy Storage) composed of Superconducting Magnet (SM) and thyristor converters, the harmonic currents which are generated by SMES converter should be compensated. We have developed active filter, the output of which is adaptively controlled such that the deviation of the waveform of ac line current from the sinusoidal one can be cancelled out. SMES system composed of two sets of GTO (Gate Turn-Off) thyristor converter, 0.5 MJ pulsed SM which are controlled by a direct digital controller, and the active filter, has been developed. The SMES system has been connected to a model power transmission system together with a 10 kVA generator. The controlled characteristics of SMES in the model power transmission system and compensated characteristics of active filter have been experimentally studied. The experimental results show that harmonic currents of SMES can be successfully compensated by active filter, and simultaneous active and reactive power control of SMES can be carried out without the influence of harmonic distortion.

Stabilization of series compensated system by superconducting magnet energy storage system

Stabilization of series compensated system by superconducting magnet energy storage system

Operation of the 30 MJ superconducting magnetic energy storage system in the Bonneville Power Administration electrical grid

The 30 MJ superconducting magnetic energy storage (SMES) system was installed in the Bonneville Power Administration (BPA) Tacoma Substation in 1982-83. Operation of the unit since that time has been for over 1200 hours. Specific tests to explore the SMES system's thermal and electrical characteristics and the control functions were conducted. The coil heat load with current modulation was determined. A converter with two 6-pulse bridges interfaces the superconducting coil to the power bus. Equal bridge voltage amplitude and constant reactive power modes of operation of the system were run with computer control of the SCR bridge firing angles. Coil energy dump tests were performed. Electrical grid system response to SMES modulation was observed, and full power SMES modulation was undertaken.

Superconducting magnetic energy storage

Superconducting magnetic energy storage (SMES) is unique among the technologies proposed for diurnal energy storage for the electric utilities in that there is no conversion of the electrical energy, which is stored directly as a circulating current in a large superconducting magnet, into another energy form such as mechanical, thermal, or chemical. Thus one advantage of SMES is the inherent high storage efficiency that is possible because energy conversion processes are avoided. The actual round-trip efficiency of a large unit is expected to be 90 percent or greater. The fast response (< 100 ms) of the system to power demand means that a diurnal storage unit can also function as a swing generator or provide system stabilization. The major components of a SMES system are a large superconducting coil cooled by liquid helium, an ac-to-dc convertor, and a refrigerator that maintains the temperature of the helium coolant. This paper describes the design and functions of these and other components of an engineering reference design for a 1-GWh SMES unit. Also included is a sketch of the historical development of superconductivity, which was first discovered in 1911, and SMES, which was first proposed as a method of diurnal storage in 1969.

Inductor-converter superconductive magnetic energy storage for electric utility usage

The authors describe the first years of the development of superconductive magnetic energy storage systems and report on analytical system design, experimental component development and electric utility usage. As an example of utility usage, they hypothesise storage superimposed on actual load curves of the Wisconsin Electric Power Company, Milwaukee, WI (WEPCO)

30 MJ superconducting magnetic energy storage for BPA transmission line stabilizer

A 30 MJ Superconducting Magnetic Energy Storage system will be installed in 1982 in Tacoma, WA, to act as an alternate means of transmission line stabilization. This will be the first use of superconductivity in the electric utility industry. The conductor has been fully tested electrically and mechanically, all major components of the electrical, control, and cryogenic systems have been received, coil assembly is complete, and the epoxy-fiberglass dewar is being purchased.

An evaluation of superconducting magnetic energy storage

A Superconducting Magnetic Energy Storage (SMES) system will accept and regenerate ac electrical energy very efficiently. It can therefore compete economically with alternative advanced storage technologies if (1) the unit's cost and efficiency are within the presently expected ranges; and (2) the unit is sized so as to perform the same task as the alternatives and no more. Present conceptual SMES designs are unlikely to meet the electric utilities' needs for reliability, maintainability and system protection; and the environmental impact of the magnetic field may be large. Consequently, the uncertainties associated with the costs of an acceptable SMES system are large. Their reduction should be the principal goal of future component and system research.

The Fermilab cryogenic energy storage system

A superconductive magnetic energy storage system has been designed to smooth the pulsating power requirement of the Fermilab accelerator. The system stores 1 MWh and operates at peak power level of 200 MW on a 10 sec cycle. The magnetic system employs cryogenically stable superconductors and a flux-forcing normal secondary. The power system uses phase controlled thyristor rectifier-inverters similar to those employed in the main accelerator power supply.