Comparative Study of Various Constant-Pressure Compressed Air Energy Storage Systems Based on Energy and Exergy Analysis

Abstract

The balance between supply and demand for electricity is mainly disrupted by the growing contribution of renewable energy sources to the electrical grid, since these sources are intermittent by nature. Therefore, the energy storage systems, mainly those of considerable size, become essential to restore the electricity balance. The compressed air energy storage (CAES) system is one of the mature technologies used to store electricity on a large scale. Therefore, this paper discusses the energy and exergy analysis of different configurations of a constant-pressure CAES system in order to improve its overall efficiency and energy density. The exergy efficiency of our basic adiabatic configuration using water as thermal storage medium is 56.4% and the energy density is 12.17 kWh/m3. The results show that the CAES system using a packed bed of quartzite rock as thermal storage medium has the best efficiency (67.2%) and energy density (17 kWh/m3) among adiabatic systems. The diabatic CAES systems could have a net efficiency up to 70.1%, and an energy density up to 31.95 kWh/m3 by using combustion chambers. Finally, the waste heat recovery from other installations such as a gas turbine power plant has the potential to improve the energy density to 20.53 kWh/m3 without using fossil fuel sources.

Resiliency-Constrained Placement and Sizing of Virtual Power Plants in the Distribution Network Considering Extreme Weather Events

“…( 11)-( 21) explain the balance of active and reactive power in VPPs, they also outline the operating model, the placement and size of DGs [37][38][39][40][41] and ALs positioned within the VPP, as well as other planning limits for VPPs in the distribution network. According to IEEE1547 [4], it is thought that in this work, RESs are only used for power supply and ALs, like ESSs [42][43][44][45][46] and DRPs, are only used for energy management in the VPP. The amount of active power generated by RESs is simulated using Eq.…”

Energy management of distribution network with inverter‐based renewable virtual power plant considering voltage security index

“…The average and standard deviations of the uncertain parameters are found for the amount of load, renewable power [143,144], and EVs, in which a normal probability distribution function (PDF) is used for the load. But Weibull and Beta PDFs were considered for renewable power output of WTs and PVs, and Rayleigh PDF was used for parameters of the storage [145][146][147][148][149][150][151][152][153][154] such as EVs. Then, the probability of occurrence of a scenario is equal to the product of the probability of the selected values of the uncertainties.…”

What are the key stability challenges in high-bandwidth, non-minimum phase systems with time-varying, and non-smooth delays?

“…The advantages of this study lie in its dedication to addressing an essential and often complex issue in power electronics and energy conversion. By delving into non-minimum phase systems, the research contributes to the understanding of challenging and less explored aspects of power factor correction in energy storage [ [67] , [68] , [69] , [70] , [71] , [72] ] such as battery chargers, which can lead to more efficient and stable energy conversion processes. However, the disadvantages may include the potential complexity of the analysis and control strategies required for non-minimum phase systems, which might limit the practicality of the proposed solutions and necessitate sophisticated control techniques.…”