Energy Storage System

Source: American Superconductor

Energy Storage System
In a Superconducting Magnetic Energy Storage (SMES) system, energy is stored within a magnet that is capable of
American Superconductoronducting Magnetic Energy Storage (SMES) system, energy is stored within a magnet that is capable of releasing megawatts of power within a fraction of a cycle to replace a sudden loss in line power. The ASC SMES units use liquid helium to keep the coil of niobium-titanium at 4.2K, the temperature required for its material to become superconducting. While in the superconducting state, the conductor material has practically no electrical resistance, which enables the coil to carry large currents with very little loss for long periods of time.

In standby mode the current continually circulates through the normally closed switch of the voltage regulator and power supply, and back to the magnet. The power supply provides a small trickle charge to replace the power lost in the non-superconducting part of the circuit. When a voltage disturbance is sensed, the controller directs real and reactive power from the inverter to the load, while automatically opening the solid-state isolation switch within two milliseconds. When the voltage across the capacitor bank reaches a pre-set level, the switch closes. This sequence repeats until normal voltage from the utility feeder is restored. This systematic transfer of energy from the magnet to the load keeps the load interruption free for optimum performance of your critical processes. The system recharges within minutes and can repeat the charge/discharge sequence thousands of times without degradation of the magnet. Recharge time can be accelerated to meet user requirements, depending on system capacity.

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