Method for coupling a steam turbine and a gas turbine at a desired differential angle using a setpoint acceleration

An arrangement having a shaft device, and a rotating device, having a clutch for coupling the shaft device and rotating device, comprising:

• a device for detecting a differential angle between the shaft device and rotating device;
• a device for detecting a differential speed between the shaft device and rotating device;
• a device for accelerating the rotating device with an acceleration value;
• a prediction module that predicts, from the detected differential angle, the detected differential speed and a known acceleration, a coupling angle which would occur if the rotating device were accelerated with the known acceleration up to a start of the coupling;
• and
• an acceleration module which compares the predicted coupling angle with a target coupling angle and calculates therefrom a setpoint acceleration such that the predicted coupling angle corresponds to the target coupling angle are present.