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Design, Fabrication, and Test of a 5 kWh Flywheel Energy Storage System Utilizing a High Temperature Superconducting Magnetic Bearing
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hull, John Ralph Mittleider, John A. Gonder, J. F. McCrary, K. E. McIver, C. R. |
| Copyright Year | 2011 |
| Abstract | The Boeing team has designed, fabricated, and is currently testing a 5 kWh / 100 kW Flywheel Energy Storage System (FESS) utilizing the Boeing patented high temperature superconducting (HTS) bearing suspension system. The Boeing FESS is designed to provide 100 kW of continuous power for one minute, as well as provide lower power for longer periods, dependant on demand. The passive HTS magnetic bearing allows the rotor to spin freely without energy absorbing mechanical connections to the stationary structure. This combination creates a mechanical energy storage device featuring very low standby losses within the passive bearing suspension system and it eliminates the complex control systems of active magnetic bearing systems. Introduction A flywheel energy storage system typically works by combining a high-strength, high-momentum rotor with a shaft-mounted motor/generator. This assembly is contained inside a vacuum / containment vessel and operates normally in a non-contact fashion with magnetic bearings acting as a suspension system. Once up to a high speed (typically 10,000 rpm or higher) the rotor’s momentum can drive the generator on demand for a sustained period. The power draw starts whenever the generator’s stator windings are switched into a load, and the discharge time available depends on the ratio of power drawn out to total kinetic energy of rotation. At some point the load is removed from the system, after which the flywheel will coast until it is convenient to recharge it. Recharging can be done with essentially the same power switching electronics that are used for the discharge, except that the timing of currents in the motor/generator stator windings is adjusted to push the flywheel back up to high speeds. Once at high speed, the flywheel system can idle thus storing energy and acting as a battery. The basic concept of a flywheel electrical system is noted in figure 1. Other common power electronic circuits invert power from the motor/generator to line voltages and frequencies. 1 Funded in part by the Energy Storage Systems Program of the U.S. Department Of Energy (DOE/ESS) through Sandia National |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.sandia.gov/ess-ssl/EESAT/2005_papers/Johnson.pdf |
| Alternate Webpage(s) | https://www.sandia.gov/ess-ssl/docs/pr_conferences/2011/5-strasik_superconducting.pdf |
| Alternate Webpage(s) | https://www.energy.gov/sites/prod/files/ESS%202010%20Update%20Conference%20-%20Developing%20a%20Flywheel%20ESS%20Utilizing%20a%20Superconducting%20Magnetic%20Bearing%20-%20Mike%20Strasik,%20Boeing.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
