Compressed air energy storage and power generation method and apparatus

A compressed air energy storage and power generation device comprising;

• a first compressor configured to be driven by fluctuating input power and to compress air;
• a first pressure accumulation tank configured to be fluidly connected to the first compressor and to store the air compressed by the first compressor;
• a first expander configured to be fluidly connected to the first pressure accumulation tank and to be driven by the compressed air supplied from the first pressure accumulation tank;
• a first generator configured to be mechanically connected to the first expander and to generate power;
• a first heat exchanger configured to perform heat exchange between the air compressed by the first compressor and a heat medium to heat the heat medium;
• a heat medium tank configured to store the heat medium heated by the first heat exchanger;
• a second heat exchanger configured to perform heat exchange between the compressed air supplied from the first pressure accumulation tank and the heat medium supplied from the heat medium tank to heat the compressed air;
• a detector configured to detect the amount of compressed air stored in the first pressure accumulation tank;
• an inlet valve provided between the first compressor and the first pressure accumulation tank;
• an air release valve adapted to be connected at an upstream side of the first pressure accumulation tank to discharge the air compressed by the first compressor to an outside;
• and
• a control device configured to, when the control device determines that the amount of compressed air stored in the first pressure accumulation tank has exceeded a predefined amount, control the inlet valve to close and the air release valve to open so that the compressed air is discharged to the outside.