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

The status of sodium sulfur batteries
Tailored Collaboration (TC) research project with American Electric Power (AEP). The NAS
unit can deliver 500 kW ac
for up to 30 seconds for power quality protection, or it can provide 30
seconds power quality protection at 300 kW ac
plus deliver 720 kWh ac
peak shaving at a maximum
power of 100kW. Figure 2-2 is a photograph of the NAS unit installed at AEP’s site.
This project evolved from an initial joint
agreement between AEP, TEPCO and
NGK. The power electronics and
system integration was supplied by
ABB. Extensive acceptance testing was
conducted at ABB’s factory in New
Berlin, WI and the AEP site. The unit
was formally commissioned in
September 2002, at AEP’s offices in
Gahanna, Ohio (near Columbus).
Performance monitoring for a period of
two years and an evaluation of the
economic potential of the project will be
conducted under the EPRI/AEP TC
project. Performance will also be
monitored and assessed via a DOE
sponsored program led by Sandia
National Laboratories.
Figure 2-1 AEP's 500 kW (PQ) / 720 kWh (PS) NAS Unit
2.2 Commercialization
As of April 2002, TEPCO and NGK formally announced the sale of commercial NAS products
in Japan, in concert with the expansion of manufacturing facilities. TEPCO will distribute NAS
systems within its service area and other utilities are expected to follow this model. NGK has
teamed with a major power electronics vendor to provide commercial systems in other Japanese
markets. NGK also plans to expand manufacturing and team with one or more power electronics
vendors to offer NAS systems in foreign markets commensurate with opportunities.
The NAS PS Module is best suited for energy management up to ~20MW, e.g., load leveling and
broad peak demand reduction, plus mitigation of power disturbances and outages for up to
several hours. The NAS PQ Module is best suited for pulse power applications up to ~100MW
such as prompt spinning reserve, voltage and frequency support, short duration power quality
protection and short peak demand reduction. The status of these product lines is characterized in
Table 2-2.
2-2