A compressed air energy storage power station comprises a first shafting ( 1 ) and a second shafting ( 2 ). A gas turbo group ( 11 ), an electrical machine ( 12 ) and a compressor ( 13 ) are arranged on the first shafting ( 1 ). Switchable clutch elements ( 14, 15 ) are arranged between the electrical machine and the gas turbo group or the compressor. The clutch elements allow a connection to be selectively made between the electrical machine and the gas turbo group ( 11 ) or the compressor ( 13 ). An expansion machine ( 21 ) for the power generating expansion of a pressurized storage fluid, an electrical machine ( 22 ) and a compressor ( 23 ) are arranged on the second shafting ( 2 ). Switchable clutch elements ( 24, 25 ) are arranged between the electrical machine and the expansion machine or the compressor and allow the electrical machine to be optionally connected to the expansion machine and to the compressor. The electrical machines are operable both as generators and as electric motors.
1. A compressed air energy storage power station having a compressor power consumption capacity and a power generation capacity, the power station comprising:
a gas turbo group;
a storage fluid expansion machine for a pressurized storage fluid, wherein the gas turbo group and the expansion machine provide the power generation capacity;
a first electrical machine;
a first shafting, wherein the gas turbo group is arranged together with the first electrical machine on the first shafting;
a second electrical machine;
a second shafting, wherein the expansion machine is arranged together with the second electrical machine on the second shafting;
a first compressor and a second compressor, the compressor power consumption capacity being split between the first compressor and the second compressor, the first compressor being arranged on the first shafting, and the second compressor being arranged on the second shafting.
2. The power station as claimed in claim 1 , further comprising:
an exhaust gas heat exchanger in the gas turbo group having a primary side and a secondary side, arranged and adapted for flowing expanded hot gas from the gas turbo group through the primary side of the exhaust gas heat exchanger, and arranged and adapted for flowing storage fluid through the secondary side before supplying it to said storage fluid expansion machine.
3. The power station as claimed in claim 1 , further comprising:
a common storage volume; and
wherein the first compressor and the second compressor are fluidly connected in parallel, such that each of the first compressor and the second compressor sucks in ambient air and both of the first and second compressors feed into the common storage volume.
4. The power station as claimed in claim 1 , further comprising:
a storage volume; and
wherein the first and second compressors are fluidly connected in series, such that one of the first compressor and the second compressor sucks in ambient air and passes compressed air to the other of the first compressor and the second compressor, and said other compressor feeds further-compressed air to the storage volume.
5. The power station as claimed in claim 4 , further comprising:
a cooler for the compressed fluid arranged fluidly between the first and second compressors.
6. The power station as claimed in claim 1 , further comprising:
a heat supply device arranged and adapted to flow storage fluid therethrough before supplying the storage fluid to the storage fluid expansion machine.
7. The power station as claimed in claim 1 , wherein the first and second electrical machines are configured and arranged to be operable as electric motors and as generators.
8. The power station as claimed in claim 1 , wherein the maximum power output of the gas turbo group is greater than or equal to the maximum power consumption of the first compressor, and the maximum power output of the expansion machine is greater than or equal to the maximum power consumption of the second compressor.
9. The power station as claimed in claim 1 , wherein the maximum pressure ratio of compression is greater than 50.
10. The power station as claimed in claim 9 , wherein the pressure ratio of compression is greater than 100.
11. The power station as claimed in claim 1 , wherein the total combined compressor power of the first compressor and of the second compressor is greater than 100 MW.
12. The power station as claimed in claim 11 , wherein the total combined compressor power of the first compressor and of the second compressor is greater than 120 MW.