Thermal energy storage: In a thermal energy storage system, thermal energy
is stored in the preface of an insulated container and converted back into
electrical energy when needed. It can also be directly used without being
converted back into electrical energy. Thermal energy storage can be further
divided into sensible thermal energy storage and latent thermal energy storage.
The heat stored in thermal energy storage can be very large, so it can be used
in renewable power generation.
Shortcomings: Thermal energy storage requires various high-temperature
chemical thermal working fluids, which are limited in application scenarios.
Chemical energy storage: using hydrogen or natural gas as a carrier for
secondary power, using the remaining electricity to produce hydrogen, hydrogen
can be directly used as an energy carrier, or it can react with carbon dioxide
to form natural gas (methane). Hydrogen may form natural gas, which can be used
not only for power generation but also for other applications such as
transportation. Germany is enthusiastic about promoting this technology and has
put demonstration projects into operation.
Shortcomings: Low full cycle power, only 40% hydrogen production power, and
less than 35% synthetic natural gas power.
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