Combined cooling heating and power energy storage system and method based on liquid carbon dioxide storage

Abstract

The invention discloses a combined cooling heating and power energy storage system and method based on liquid carbon dioxide storage. The combined cooling heating and power energy storage system comprises a solar photovoltaic/wind power generation system, an energy storage subsystem, an energy release subsystem, a heat storage and supply system and a cold storage and supply system. The solar photovoltaic/wind power generation system is connected with the energy storage subsystem through a driving motor, and the energy storage subsystem is connected with the heat storage and supply system through a first heat exchanger; the energy release subsystem is connected with the energy storage subsystem through a second carbon dioxide liquid storage tank; the energy release subsystem is connected with the heat storage and supply system through the second heat exchanger; the cold storage and supply system is connected with the energy storage subsystem through the first refrigeration heat exchanger and connected with the energy release subsystem through the second refrigeration heat exchanger. Carbon dioxide serves as an energy storage medium, surplus new energy electric power of a community is stored based on liquid phase storage of carbon dioxide, meanwhile, heat energy and cold energy utilization in the energy storage and release process is optimized, the requirements for heat supply, cold supply and the like of resident life can be met while electricity storage is met, and a meaningful thought can be provided for construction and development of a community micro-grid.

Description

technical field [0001] The invention belongs to the technical field of microgrid energy storage and combined cooling, heating and power, and in particular relates to a combined cooling, heating and power energy storage system and method based on liquid carbon dioxide storage. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. It is an autonomous system that can realize self-control, protection and management. It is an important part of the smart grid, which is connected to the external grid and can also be operated in isolation. With the increasingly serious problems of energy shortage and environmental pollution, microgrids are being piloted in many communities, and energy storage technology is gradually becoming a key technology for the development of distributed energy. [0003] Exis...

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Problems solved by technology

[0003] Existing energy storage technologies can be divided into mechanical energy storage, electrochemical energy storage, electromagnetic energy storage, etc. according to the energy storage methods, among which mechanical energy storage technologies include pumped water energy storage technology, compressed air energy storage technology, flywheel energy storage, etc.; However, due to the limitation of technical level and implementation conditions, the only technologies that can realize large-scale energy storage are pumped hydro storage technology and compressed air energy storage technology.

[0004] However, both pumped hydro storage technology and compressed air energy storage technology have certain limitations in their

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