Does insufficient charging/discharging affect energy storage performance?
The evaluations of the energy storage density, system efficiency and power output, under the effects of insufficient charging/discharging, are presented in Fig. 8, Fig. 10, Fig. 12. The results demonstrate that the actual performance of density and power, except for the system efficiency, could highly deviate from the targets at design conditions.
Does insufficient charging and discharging affect energy density?
However, the effects of insufficient charging and discharging, due to the variability of renewable energy have not been investigated before. The output power and the energy density evaluated in the present work could be incorporated with future work of techno-economic analysis.
What is a sufficient charging/discharging at design conditions?
A clearly defined sufficient charging/discharging at design conditions is a point in the phase space (noted by the star in green), while the rest of the space can be referred to as “off-design conditions”. For example, two dashed curves are given for off-design charging and discharging.
What are the four scenarios for insufficient charging and discharging?
Therefore, all the scenarios for insufficient charging and discharging can be classified into four categories, which are charge begin, discharge end, charge midway and discharge midway as shown in Fig. 4. These processes will be rearranged in Sec. 4 for further analysis.
What is the insufficiency extent of charging/discharging?
Sufficient charging/discharging only occurs on the second day, and the insufficiency extent on the first day and the third day could be about 75 and 50%, respectively. Here, the insufficiency extent of charging/discharging is evaluated by the normalized pressure at the high-pressure tank. Fig. 1.
Should energy storage systems be treated seriously?
Remarkable reductions in density and power should be considered seriously. If not well treated, it would bring some uncertainty and insecurity to larger-scale electricity grids. More importantly, this could fundamentally deteriorate the economic performance of an energy storage system over a long period.
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