What is superconducting magnetic energy storage (SMES)?

Superconducting magnetic energy storage (SMES) systems store energy in the magnetic field created by the flow of direct current in a superconducting coil that has been cryogenically cooled to a temperature below its superconducting critical temperature. This use of superconducting coils to store magnetic energy was invented by M. Ferrier in 1970.

How does a superconductor store energy?

It stores energy in the magnetic field created by the flow of direct current (DC) power in a coil of superconducting material that has been cryogenically cooled. The stored energy can be released back to the network by discharging the coil.

What is a superconducting system (SMES)?

A SMES operating as a FACT was the first superconducting application operating in a grid. In the US, the Bonneville Power Authority used a 30 MJ SMES in the 1980s to damp the low-frequency power oscillations. This SMES operated in real grid conditions during about one year, with over 1200 hours of energy transfers.

Why do superconducting materials have no energy storage loss?

Superconducting materials have zero electrical resistance when cooled below their critical temperature—this is why SMES systems have no energy storage decay or storage loss, unlike other storage methods.

What are superconductors used for?

Superconductors are being considered for SMES, in which electric energy is stored by circulating a current in a superconducting coil without resistive losses. Niobium–titanium alloys are used for storage at liquid helium temperatures (2–4 K).

What is energy storage technology?

This technology is based on three concepts that do not apply to other energy storage technologies (EPRI, 2002). First, some materials carry current with no resistive losses. Second, electric currents produce magnetic fields. Third, magnetic fields are a form of pure energy which can be stored.