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An integrated energy storage scheme for a dispatchable solar and wind powered energy systema)
a)Contributed paper, published as part of the Proceedings of the 23rd International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems, Lausanne, Switzerland, June 2010.
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Image of FIG. 1.
FIG. 1.

The profiles of typical wind velocities, solar radiation, and ERCOT load in West Texas have important differences. Wind is out of phase with demand, while solar availability tracks demand more closely.

Image of FIG. 2.
FIG. 2.

CAES mimics a typical natural gas power cycle with the addition of an air storage cavern and the decoupling of the compressor and turbine.

Image of FIG. 3.
FIG. 3.

A solar thermal and thermal storage system replaces the natural gas combustor © and electricity is supplied by wind turbines in order to turn the typical CAES plant into DSWiSS (LP = low pressure, IP = intermediate pressure, HP = high pressure). States 1 through 17 are indicated.13

Image of FIG. 4.
FIG. 4.

The power system energy inflows and outflows (marked on this diagram) are needed to calculate the power generation efficiency.

Image of FIG. 5.
FIG. 5.

Conceptual T-s (temperature-entropy) diagram of the DSWiSS cycle illustrates the complexity of the turbomachinery.

Image of FIG. 6.
FIG. 6.

LCOE for DSWiSS is competitive with that of current generation technologies.17,18,20 However, this LCOE does not include any of the available tax credits or any carbon costs.


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Table I.

These data, taken from the McIntosh CAES facility, are used for the thermodynamic simulation of DSWiSS (Ref. 13).

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Table II.

These specific assumptions are necessary for the simulation of the power system and were not available from McIntosh data.

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Table III.

Summary of power system components inlet and outlet states and associated equations. (ω = specific work, q = specific heat transfer).

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Table IV.

The results show that DSWiSS must use both wind and solar resources.

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Table V.

Steady state and daily output parameters.

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Table VI.

Selecting the CAPEX and OPEX costs allows for the calculation of the LCOE (Refs. 11, 17–19).

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Table VII.

Estimated LCOE for the DSWiSS using two different solar thermal technologies.


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Scitation: An integrated energy storage scheme for a dispatchable solar and wind powered energy systema)