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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
EPRI Proprietary Licensed Material Table 2-2. The Status of NAS Commercial Product Lines Technology Variants/ Product Line Status Target Markets, Funding Organizations Power Electronics Vendors Major Demonstrations Lessons Learned Major Development Trends Unresolved Issues Peak Shaving (NAS PS Module) Commercial (in Japan) Utility and large Comm’l/Ind’l >500kW to ~20MW TEPCO, NGK Teaming arrangements in progress See Table 2-1 especially, TEPCO S/S at Ohito and Tsunashima 6MW, 48MWh Confirmed comm’l scale manufacturing of large cells and modules Confirmed utility scale operations Mass production scale-up Competitiveness, certification (outside Japan) Multiple functional value accrual Power Quality (NAS PQ Module) Early Commercial (in Japan, demo in US) Utility and large Comm’l/Ind’l >2MW to ~100MW TEPCO, NGK Teaming arrangements in progress See Table 2-1, namely: Fujitsu, 3MW (Pulse Factor: 3) AEP, 500kW (Pulse Factor: 5) Value of prompt battery response PCS integration for combined PS and PQ Mass production scale-up Competitiveness, certification (outside Japan) Multiple functional value accrual 2-3
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