Join us for a talk from Thomas Deetjen, University of Texas at Austin on improved solar integration using cooling thermal energy storage.

Abstract

This study discusses the use of cooling thermal energy storage (CTES) in cooling-dominated climates for improving the flexibility of the electric grid, particularly in residential networks with large amounts of solar PV capacity. It focuses on Texas, USA, but its results have implications for developing regions where air conditioning demand is projected to increase dramatically in the 21st century. The study utilizes a mixed-integer linear program for choosing the capacity and dispatch of rooftop solar, cooling equipment, and CTES to minimize the total system cost. Using a residential network located in Texas as a case study and exposing the homes to real time prices, CTES can reduce peak demand, on-peak energy purchases, and operating cost. The CTES operation strategy incentivized by these price signals, however, only slightly reduces peak demand while also increasing electric demand ramp rates, making it more difficult to balance grid-level generation, solar output, and demand. This challenging behaviour can be improved using alternative market incentives or operational constraints, changing TES from a grid-balance liability into a flexibility-providing asset and a helpful resource for improving solar PV integration.

Bio

Thomas Deetjen began his graduate education after working in industry as an engineering consultant in the areas of campus utility distribution, central utility plant design, and commercial building design. During his time at the University of Texas, he is exploring the implications of integrating large amounts of renewable energy into the electric grid. He is using that understanding to evaluate how urban energy systems can utilize thermal energy storage, demand response, and other strategies to lower their costs and improve the operation of grids that contain large amounts of renewable energy generation.Thomas’ research focus areas include• Energy systems modeling, optimization, and analysis• Renewable energy integration into the electric grid• Grid services from urban energy cooperatives and demand side management• Electricity markets