(335g) Integrating Energy Storage Systems into Renewable Grids – a Model Based Approach

Accurate and economical sizing of stand-alone power system components, including batteries, has been an active area of research in microgrid applications, but current approaches to integrating batteries into the entire microgrid components do not make them economically feasible. Typically, batteries are treated as a black box that does not account for their internal states in current microgrid simulations.^1-4 This might lead to under-utilization and over-stacking of batteries. In contrast, detailed physics-based battery models, accounting for internal states, can save a significant amount of energy and cost, utilizing batteries with maximized life and usability.^5-6 It is important to identify how efficient physics-based models of batteries can be included and addressed in grid control strategies.⁷ In this talk, we present simple examples for microgrids and the direct simulation of the same including physics-based battery models. A representative microgrid example, which integrates stand-alone PV arrays, a maximum power point tracking controller, batteries, and power electronics, is illustrated. The results of the proposed approach are compared with the conventional approaches and improvements in performance and speed are reported.⁵

Acknowledgements This work was supported by the Clean Energy Institute located in University of Washington, Seattle and Washington Research Foundation. The battery modeling work has been supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U. S. Department of Energy through the Advanced Battery Material Research (BMR) Program (Battery500 Consortium).

References

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