Carbon dioxide energy storage system, lubricating oil supply device thereof, and control method therefor

A control method for a carbon dioxide energy storage system, wherein the carbon dioxide energy storage system comprises a gas storage unit, an energy storage component, a liquid storage unit, and an energy release component sequentially connected in a closed loop;

• and the carbon dioxide energy storage system further comprises a lubricating oil supply device;
• the liquid storage unit is configured to store liquid carbon dioxide, and high-pressure carbon dioxide gas is contained in the liquid storage unit;
• wherein the lubricating oil supply device comprises a first oil supply unit and a second oil supply unit respectively connected among a lubricating oil tank, the energy storage component, and the energy release component;
• the first oil supply unit is configured to supply a first oil amount of lubricating oil to the energy storage component and the energy release component, and the second oil supply unit is configured to supply a second oil amount of the lubricating oil to the energy storage component and the energy release component;
• the second oil supply unit is connected to the liquid storage unit and driven by taking the high-pressure carbon dioxide gas contained in the liquid storage unit as a power source to supply the lubricating oil;
• and
• wherein the second oil amount is smaller than the first oil amount, and the control method comprises:
• controlling the first oil supply unit to supply the lubricating oil to the energy storage component and controlling the second oil supply unit to supply the lubricating oil to the energy release component, when the carbon dioxide energy storage system is in normal operation, the energy storage component is in an energy storage operation condition and the energy release component is in a turning operation condition;
• controlling the first oil supply unit to supply the lubricating oil to the energy release component and controlling the second oil supply unit to supply the lubricating oil to the energy storage component, when the carbon dioxide energy storage system is in the normal operation, the energy release component is in an energy release operation condition, and the energy storage component is in the turning operation condition;
• controlling the second oil supply unit to simultaneously supply the lubricating oil to the energy storage component and the energy release component when the carbon dioxide energy storage system is in a failing state to cause the first oil supply unit unable to supply the lubricating oil.