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U of Colorado student looks at storage systems for optimizing renewable resources

From the January 10, 2014 issue of Public Power Daily

Originally published January 10, 2014

Michele Lim, a student at the University of Colorado at Boulder, recently completed a DEED scholarship project to find the optimal type, size and placement of an energy storage system that will reduce the grid frequency fluctuations that occur due to the intermittent nature of renewable energy sources. The project was supported by APPA's Demonstration of Energy & Efficiency Developments program.

Because of the increasing amounts of renewable generation displacing traditional sources of energy and because energy storage systems are expensive, finding the optimal size is important in minimizing cost while maximizing the effectiveness of the storage system. Lim's research was sponsored by the Platte River Power Authority in Fort Collins, Colo. She found that a Proportional-Integral-Derivative controller was an adequate device for controlling the storage system power output to reduce frequency fluctuations. Under the conditions used in the study, Lim also found that the cheapest energy storage system was a flooded lead-acid battery.

Lim’s final project report, "Energy Storage Sizing and Placement on a Grid," is posted in the DEED Project Database.


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