Modeling And Sizing Of Energy Storage Devices For Wind Power Generation

Darwin Cordovilla


Variability in wind power generation prevents the electric grid from relying on this source of energy.  Coal, natural gas, and hydropower companies all schedule generators in advance. Wind turbines, however, are not predictable, making it difficult to follow a scheduling plan. Storing electricity can serve to mitigate wind fluctuations, enabling the absorption of energy during peak production and supplying energy to the grid during troughs. A pair of storage devices, which maximizes profit based on fluctuating electricity prices, has been modeled. Optimization of control actions of the storage devices to maximize profit was achieved with CVX. The simulations resulting from this study show that installing a large-rate, relatively low-storage capacity device, and a large-storage, relatively low-rate capacity device interconnected can smooth variations in wind power production much more economically than a single storage device with both large storage and rate capacities. Furthermore, this study shows that the device’s efficiencies do not have a high impact on the profit obtained with a particular device pair. Finally, these results can be used to choose a combination of storage technologies with the appropriate set of characteristics that will mitigate wind fluctuations and maximize profit.


Wind power, energy storage, optimization

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