A peak-shaving energy storage device using carbon dioxide as a working medium and its control method

Abstract

The invention discloses a peak regulation energy storage device with carbon dioxide as a working medium and a control method thereof. The peak regulation energy storage device comprises an energy storage system and an energy release system. The energy storage system comprises a carbon dioxide energy storage cycle subsystem, a first energy storage subsystem and a second energy storage subsystem, wherein the carbon dioxide energy storage cycle subsystem is used for achieving the energy storage thermodynamic cycle of the carbon dioxide, the first energy storage subsystem is used for achieving basic energy storage of cold and heat, the second energy storage subsystem is used for achieving multistage storage of energy, and the energy release system comprises a carbon dioxide energy release cycle subsystem, a first energy release subsystem and a second energy release subsystem. The carbon dioxide energy release cycle subsystem is used for achieving the energy release thermodynamic cycle of the carbon dioxide, the first energy release subsystem is used for achieving basic energy release of cold and heat, and the second energy release subsystem is used for achieving multistage release of energy. Through the peak regulation energy storage device with the carbon dioxide as the working medium and the control method thereof, multistage energy storage and release can be achieved, and peak load shifting is conducted flexibly.

Description

technical field [0001] The invention belongs to the technical field of peak regulation energy storage devices and their control, in particular to a peak regulation energy storage device using carbon dioxide as a working medium and a control method thereof. Background technique [0002] Traditional energy sources are increasingly scarce and environmental protection pressures are becoming more and more serious. More attention has been paid to new energy sources, posing challenges to the safe and stable operation of the power grid. Energy storage technology can solve problems such as shifting peaks and filling valleys to a greater extent. [0003] At present, traditional energy storage technologies include pumped hydro storage, compressed air energy storage and electrochemical energy storage. Pumped hydro storage technology relies on specific geological conditions and requires sufficient water sources; compressed air energy storage has low energy storage efficiency and low energ...

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Problems solved by technology

[0004] However, the currently used energy storage system using carbon dioxide as the working fluid has problems such as inflexible energy storage scale. When user needs change, multiple systems need to be deployed, resulting in increased costs and other issues.

For example, an electrothermal energy storage system (201610872927.3), because the energy storage unit and the energy release unit of the system have a single component, and the energy storage and supply scale is fixed, the fluctuation range is small and the flexibility is low, and it cannot adapt to changes in user needs.

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