Abstract
The development of new technologies for large-scale electricity storage is a key element in future flexible electricity transmission systems. Electricity storage in adiabatic compressed air energy storage (A-CAES) power plants offers the prospect of making a substantial contribution to reach this goal. This concept allows efficient, local zero-emission electricity storage on the basis of compressed air in underground caverns. The compression and expansion of air in turbomachinery help to balance power generation peaks that are not demand-driven on the one hand and consumption-induced load peaks on the other. For further improvements in cost efficiencies and flexibility, system modifications are necessary. Therefore, a novel concept regarding the integration of an electrical heating component is investigated. This modification allows increased power plant flexibilities and decreasing component sizes due to the generated high temperature heat with simultaneously decreasing total round trip efficiencies. For an exemplarily A-CAES case simulation studies regarding the electrical heating power and thermal energy storage sizes were conducted to identify the potentials in cost reduction of the central power plant components and the loss in round trip efficiency.
Highlights
The proportion of electrical energy generated from wind and other renewable sources is set to rise significantly in manyThe discrepancy in load and generation require a flexibilisation of the electrical energy system that can be achieved using energy storage systems (ESS) [1]
A promising adiabatic compressed air energy storage (A-Compressed Air Energy Storages (CAES)) power plant is based on a two-stage system with one thermal energy storage systems in the lowpressure (LP) and one in the high pressure range (HP)
The electrical heating option is modelled in a simple way by assuming an ideal transformation of electrical (PHeating) to thermal power (Qth ), which results in a temperature difference (ΔTF) for a given mass flow rate (m F ) and specific heat capacity of the fluid (F)
Summary
The discrepancy in load and generation require a flexibilisation of the electrical energy system that can be achieved using energy storage systems (ESS) [1]. High storage capacities and system power respectively are provided by pumped storage power plants (PSPP) This technology is an adequate solution for the large-scale integration of wind energy due to their excellent characteristics for balancing by both extracting from, and supplying electrical energy to the grid. In periods of low grid load they store electrical energy from base-load power plants or wind farms by means of compressed air. Adiabatic compressed air energy storages (A-CAES) already obtain efficiency at 70% [9] and can already compete with PPSPs. The basic idea of the A-CAES concept is to use heat storages as a central element of the plant. System modifications regarding the integration of an electrical heating component are investigated This novel concept allows decreasing component sizes due to the generated high temperature heat and increased power plant flexibilities with minimal intervention in the power plant configuration
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