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Market Evaluation of Energy Storage Systems Incorporating Technology-Specific Nonlinear Models

IEEE Transactions on Power Systems

Nguyen, Tu A.; Copp, David C.; Byrne, Raymond H.; Chalamala, Babu C.

A generic constant-efficiency energy flow model is commonly used in techno-economic analyses of grid energy storage systems. In practice, charge and discharge efficiencies of energy storage systems depend on state of charge, temperature, and charge/discharge powers. Furthermore, the operating characteristics of energy storage devices are technology specific. Therefore, generic constant-efficiency energy flow models do not accurately capture the system performance. In this work, we propose to use technology-specific nonlinear energy flow models based on nonlinear operating characteristics of the storage devices. These models are incorporated into an optimization problem to find the optimal market participation of energy storage systems. We develop a dynamic programming method to solve the optimization problem and perform two case studies for maximizing the revenue of a vanadium redox flow battery (VRFB) and a Li-ion battery system in Pennsylvania New Jersey Maryland (PJM) interconnection's energy and frequency regulation markets.

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TYPE Journal Article YEAR 2019
DOIOSTIScopus

Open data, models, and codes for vanadium redox batch cell systems: A systems approach using zero-dimensional models

Journal of Electrochemical Energy Conversion and Storage

Lee, Seong B.; Mitra, Kishalay; Laros, James H.; Anderson, Travis M.; Ramadesigan, Venkatasailanathan; Chalamala, Babu C.

In this paper, we study, analyze, and validate some important zero-dimensional physics-based models for vanadium redox batch cell (VRBC) systems and formulate an adequate physics-based model that can predict the battery performance accurately. In the model formulation process, a systems approach to multiple parameters estimation has been conducted using VRBC systems at low C-rates (∼C/30). In this batch cell system, the effect of ions’ crossover through the membrane is dominant, and therefore, the capacity loss phenomena can be explicitly observed. Paradoxically, this means that using the batch system might be a better approach for identifying a more suitable model describing the effect of ions transport. Next, we propose an efficient systems approach, which enables to help understand the battery performance quickly by estimating all parameters of the battery system. Finally, open source codes, executable files, and experimental data are provided to enable people’s access to robust and accurate models and optimizers. In battery simulations, different models and optimizers describing the same systems produce different values of the estimated parameters. Providing an open access platform can accelerate the process to arrive at robust models and optimizers by continuous modification from the users’ side.

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TYPE Journal Article YEAR 2019
DOIOSTIScopus
Results 51–75 of 137
Results 51–75 of 137