Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear.

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Presentation transcript:

Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL SAND P Hawaii Energy Storage Seminar: Lanai La Ola Case Study Abbas Akhil Sandia National Laboratories Distributed Generation and Energy Storage (505) June 16, 2010

Lanai Grid

Lanai Grid with La Ola PV

Miki Basin Power Station (6) 1.0 MW EMD Diesel Generators (2) 2.2 MW Caterpillar Diesel

La Ola PV

kW 1.2 MW 5.5 MW 4.3 MW Energy Storage for Ramp Rate Support (Simplified Example)

La Ola Battery Specification Battery type and size specified in Power Purchase Agreement Battery type: Flow battery manufactured by VRB 250 kW power with 3 hours of energy storage; 750 kWh PPA required mostly grid support functions

Evolution of La Ola Battery Design VRB ceased commercial operations in late hours of storage was excessive for ramp rate control Need power, not energy Flow batteries are “energy” batteries La Ola’s return to investor is maximized if every kWh generated is sold immediately Energy storage has a roundtrip efficiency “overhead” Battery charging energy comes from PV or purchased from MECO

Transition Concepts Re-Evaluated battery size: Need power, not energy Suitable sizes ranged between 450 kW – 750 kW; 1 hour storage Evaluated other battery technologies: Lead-acid, Sodium/Sulfur and Lithium Ion At year end 2008: Lead-acid battery system 405 kW; 1 to 3 hours of storage Air conditioned building to house battery system Identified turnkey system supplier and obtained firm price quotations

In-Depth Analysis Battery sizing analysis by SunPower, Sandia Labs and NREL in early second power and irradiance data from similar-sized PV farm 10 months field-recorded data Three independent approaches using common input data set Battery sizing considerations: Ramp rates, duration and frequency of ramps Challenges: Vast amount of data; random ramp rate pattern; uncertainty that all “events” are captured Battery size: 450 – 700 kW; 250 – 500 kWh energy required to meet ramp rate support requirements

Irradiance and Power Output Source: SunPower Corp

1 Second Ramps in Plant Output Source: SunPower Corp

Final Lanai Battery Outcome Castle and Cooke selected Xtreme Power: a turnkey battery system supplier Contract negotiations underway Battery system size: MW; 500 kWh storage capacity

Need for Energy Storage with Renewables (in Hawaii) Need for energy storage to support renewable penetration: Ramp rate control “Time Shift” Store “spilled” renewable generation Note: Energy storage, not exclusively battery energy storage

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