Structure diagram of the clockwork energy storage device

What are the three thermodynamic electricity storage technologies?

In this paper, three thermodynamic electricity storage technologies, namely CAES, CCES and PTES, are comprehensively reviewed. For each technology, the basic principle is firstly clarified and then system structures and storage devices are summarized. Thereafter, the corresponding demonstrations and costs of different routes are sorted out.

What is thermodynamic energy storage?

Thermodynamic electricity storage adopts the thermal processes such as compression, expansion, heating and cooling to convert electrical energy into pressure energy, heat energy or cold energy for storage in the low period of power consumption, and then convert the stored energy into electrical energy at the peak of electricity consumption.

Does thermodynamic electricity storage depend on water resources?

On the contrary, thermodynamic electricity storage does not depend on water resources, and can be used as a supplement or substitute for PHES stations. Meanwhile, it should be noted that thermodynamic electricity storage is often accompanied by the storage and release of cold energy and heat energy.

Which thermodynamic electricity storage technology is most suitable for long-term storage?

Compared to other storage technologies, the thermodynamic electricity storage technology represented by CAES, CCES and PTES is more suitable for large-scale and long-term storage. In recent years, CAES, CCES and PTES technologies have been widely investigated and vigorously developed.

How does a heat storage subsystem work?

After heated and expanded, CO 2 at the turbine outlet absorbs the cold energy stored in the charging process and is condensed into a liquid state. The condensed liquid CO 2 is then stored in the low-pressure liquid CO 2 storage tank. Furthermore, the heat storage subsystem is basically the same as that of CAES.

How does a solar energy storage system work?

To store the energy, the system uses an injection/production well that extended from the ground surface to a deep aquifer. During the charging process, CO 2 is injected into the target deep aquifer through wellbore. During the discharging process, CO 2 is produced to the ground surface to complete the power generation process.