Handbook of Energy Storage for Transmission or ... - W2agz.com

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Figure 14
Block Diagram And Electrical Schematic Of Stabilizer Application In Distribution
Flywheel Energy Storage Solution for Serving Fluctuating Loads (NYPA Case)
In many ways the flywheel-based dynamic controller is a natural for this application.
Flywheels are a proven technology for fast response and excellent dynamic damping
characteristics. When designed for power, the kW output rating can be quite high relative
to their size and weight. When several flywheel modules are required to match the
fluctuating load, paralleling is straightforward.
Electric service to light rail, subway trains, or trolley systems is an interesting application
of this energy storage solution. Load fluctuations are related to electric trains starting up
and stopping, with opportunity of demand reduction and energy recovery via regenerative
braking. A practical case in point is a prototype installation in New York City, where
NYPA is financing a flywheel energy storage system connected to the subway. The site is
on New York City Transit (NYCT) premises. The installation is on Broad Channel, near
the recently constructed bay equalizer site at the Far Rockaway Test Track, see Figure 15.
Figure 15
Two 6-MW Substations (NYPA) and 1MW Storage (NYCT) Service Far Rockaway Line
Flywheels Page 30