Heat pump energy storage system based on indirect cold and heat storage

Abstract

The invention discloses a heat pump energy storage system based on indirect cold and heat storage. The system comprises a heat pump heating and refrigerating energy storage loop, a cold and heat energy heat engine power generation loop, an indirect heat storage loop and an indirect cold storage loop. A power station off-peak (low-price) electric driven heat pump heating and refrigerating circulation loop is adopted for preparing high-temperature heat energy and low-temperature cold energy, and the high-temperature heat energy and the low-temperature cold energy are exchanged to the indirect heat storage loop and the indirect cold storage loop through a heat exchanger and stored in a heat storage unit and a cold storage unit. At the peak of power utilization, gas of the cold and hot energyheat engine power generation loop exchanges heat with the indirect heat storage loop and the indirect cold storage loop through the heat exchanger, stored high-temperature heat energy and low-temperature cold energy are absorbed, and a generator is driven to generate power through heat engine circulation. The heat pump energy storage system based on indirect cold and heat storage has the advantages of being simple in structure, low in cost, high in energy storage density, high in efficiency, suitable for power grid peak regulation and various renewable energy power stations, free of greenhousegases and the like.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to an energy storage system, in particular to a heat pump energy storage system based on indirect cold storage and heat storage, which is an energy storage system based on heat pump cycle storage energy and using the stored energy to generate electric energy . Background technique [0002] In recent years, renewable energy is gradually becoming an important source of new electricity, and major changes have taken place in the grid structure and operation mode. With the increasing popularity of renewable energy (wind energy, solar energy, etc.), and the urgent need for grid peak regulation, improving grid reliability, and improving power quality, the importance of power energy storage systems has become increasingly prominent. Energy storage is an important component and key supporting technology of smart grids, energy systems with a high proportion of renewable energy, and "Int...

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Problems solved by technology

However, the energy storage density of compressed air energy storage technology is low, and the difficulty lies in the need for suitable places where compressed air can be stored, such as sealed caves or abandoned mines, etc.

Moreover, the compressed air energy storage system still relies on the burning of fossil fuels to provide heat sources. On the one hand, it faces the threat of the gradual depletion of fossil fuels and rising prices; Zero emissions), renewable energy development requirements

[0006] In order to solve the main problems faced by tra

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