Two-shaft gas turbine power generation equipment

Two-shaft gas turbine power generation equipment comprising:

• a compressor having a compressor rotor and configured to compress air to produce compressed air by rotation of the compressor rotor;
• a combustor configured to burn a fuel in the compressed air to produce a combustion gas;
• a high-pressure turbine having a high-pressure turbine rotor that is mechanically coupled with the compressor rotor and in which the high-pressure turbine rotor is rotated by the combustion gas;
• a low-pressure turbine having a low-pressure turbine rotor that is not coupled to the high-pressure turbine rotor and in which the low-pressure turbine rotor is rotated by the combustion gas exhausted from the high-pressure turbine;
• a power generator configured to generate power in rotation of the low-pressure turbine rotor and electrically connected to a power system to which alternating current power flows;
• an induction motor being electrically connected to the power system in parallel with the power generator and configured to receive/transmit power from/to the power system;
• a frequency converter being provided between the induction motor and the power system in an electrical connection relationship, configured to control reception/transmission of power between the induction motor and the power system, convert a frequency of the power from the induction motor into a frequency of the power system when the power from the induction motor is transmitted toward the power system, and convert a frequency of the power from the power system to a frequency of the induction motor when the power from the vicinity of the power system is received and supplied to the induction motor;
• and
• a speed reducer configured to make a rotational speed of the motor rotor of the induction motor slower than a rotation speed of the compressor rotor,
• wherein the speed reducer has:
• a compressor-side shaft that is mechanically coupled with the compressor rotor;
• a motor-side shaft that is disposed parallel to the compressor-side shaft at an interval and is mechanically coupled with the motor rotor;
• a first compressor-side helical gear that is mounted on the compressor-side shaft and is rotated integrally with the compressor-side shaft;
• a first motor-side helical gear that is mounted on the motor-side shaft, is rotated integrally with the motor-side shaft, and meshes with the first compressor-side helical gear;
• a second compressor-side helical gear that is mounted on the compressor-side shaft and is rotated integrally with the compressor-side shaft;
• and
• a second motor-side helical gear that is mounted on the motor-side shaft, is rotated integrally with the motor-side shaft, and meshes with the second compressor-side helical gear.