A control system for controlling a subsea gas compression system

Control system for controlling a subsea gas compression system including a compressor (1), an electric motor (2) driving the compressor, and at least one valve (3) for controlling a flow through the compressor. The control system includes a subsea control system (6') comprising a plurality of process sensors (8, 9, 10) for measuring process parameters of the compression system, a compressor controller (22) configured to generate control commands for controlling the motor and the valve based on measurements of the process parameters from the sensors, and an electric device (12') including hardware and software for influencing a part of the gas compression system. The electric device is arranged to receive measurements from the process sensors and the compressor controller is integrated in the electric device. The electric device is any of an actuator (12') for controlling the position of the valve, a variable speed drive (14') for controlling the speed of the motor (2) driving the compressor by adjusting the frequency of the power supplied to the motor, a switchgear (16') connected to the variable speed drive for turning on and off the variable speed drive, or an uninterruptible power supply for providing emergency power to the control system.