08-16-2017, 08:49 PM
SMES is a grid-enabling device that stores and discharges large quantities of power almost instantaneously. The system is capable of releasing high levels of power within a fraction of a cycle to replace a sudden loss or dip in line power. Strategic injection of brief bursts of power can play a crucial role in maintaining grid reliability especially with today s increasingly congested power lines and the high penetration of renewable energy sources, such as wind and solar.
A typical SMES consists of two parts cryogenically cooled superconducting coil and power conditioning system which are motionless and result in higher reliability than many other power storage devices. Ideally, once the superconducting coil is charged, the current will not decay and the magnetic energy can be stored indefinitely.
Benefits of SMES
Improves power quality for critical loads and provides carryover energy during momentary voltage sags and power outages
Improves load leveling between renewable energy sources (wind, solar) and the transmission and distribution network
Environmentally beneficial as compared to batteries; superconductivity does not rely on a chemical reaction and no toxins are produced in the process
Enhances transmission line capacity and performance SMES features a high dynamic range, an almost infinite cycling capability, and an energy recovery rate close to 100%
Ultra-high field operation enables long-term storage SMES systems in a compact device with cost advantages in material and system costs
Relevance
Modular units can address both long term (hours) and short term (seconds) storage requirements to help load leveling on the grid being fed by variable renewable sources such as solar and wind. Exceeding roundtrip efficiency requirements at 85%, SMES can have both energy storage and dynamic compensation capabilities thanks to the nearly instantaneous dynamic response of the superconducting coil.
