Compressed gas energy storage and recovery system having pressure control

A compressed gas energy storage and recovery system comprising:

• a gas compression line (1) with at least one compression stage (3), each compression stage (3) comprising a compression means (100, 101, 102) and a heat storage and recovery means (200, 201, 202) downstream, in the direction of circulation of the gas, of said compression means (100, 101, 102),
• at least one compressed-gas storage means (1000) for storing the compressed gas,
• an expansion line (2) for expanding the compressed gas stored in the compressed-gas storage means (1000), the expansion line (2) comprising at least one expansion stage (4), each expansion stage (4) comprising pipes and an expansion means (700, 701, 702), the pipes being configured to circulate the compressed gas into at least one of the heat storage and recovery means (200, 201, 202) so as to warm the compressed gas before the expansion means (700, 701, 702), characterized in that the compressed gas energy storage and recovery system comprises a first pressure-regulating means (2000) positioned between the last compression stage of the compression line and the compressed-gas storage means (1000), and preferably a second pressure-regulating means (2001) positioned between the compressed-gas storage means (1000) and the first expansion stage of the expansion line.