The invention relates to a multi-shaft compressor unit and a control method thereof, in particular to a steam-
electricity double-drive multi-shaft compressor unit connected with double clutches and a control method of the steam-
electricity double-drive multi-shaft compressor unit. The technical problems that in the prior art, a pure
electricity mode, a pure steam mode and a steam-electricity double-drive mode cannot be switched on line, and when steam is sufficient, a motor cannot be disengaged, so that energy is wasted are solved. The
system comprises a multi-shaft compressor, a
steam turbine, a motor, a first
clutch, a second
clutch, a steam flow sensor, a controller and a rotating speed sensor. The multi-shaft compressor comprises a driving shaft; the driving shaft is provided with two driving ends which are respectively a first driving end and a second driving end; the output shaft of the
steam turbine is coaxially connected with the first driving end through a first
clutch; an output shaft of the motor is coaxially connected with the second driving end through the second clutch; and rotating speed sensors are arranged on the first driving end, the second driving end, the
steam turbine and the output shaft of the motor.