Co2 refrigeration system with automated control optimization

A refrigeration system comprising:

• a receiver configured to collect a gas refrigerant produced by the refrigeration system and comprising an outlet through which the gas refrigerant exits the receiver;
• a gas bypass valve fluidly coupled to the outlet of the receiver and operable to control a pressure of the gas refrigerant in the receiver by controlling a first flow of the gas refrigerant from the receiver through the gas bypass valve;
• a parallel compressor fluidly coupled to the outlet of the receiver in parallel with the gas bypass valve and operable to control the pressure of the gas refrigerant in the receiver by compressing a second flow of the gas refrigerant from the receiver and discharging the compressed gas refrigerant into a discharge line;
• and
• a controller configured to:
• switch from operating the gas bypass valve to operating the parallel compressor to control the pressure of the gas refrigerant in the receiver in response to a value of a process variable crossing a switchover setpoint, the value of the process variable depending on an amount of the gas refrigerant produced by the refrigeration system;
• and
• automatically adjust the switchover setpoint in response to the amount of the gas refrigerant produced by the refrigeration system being insufficient to sustain operation of the parallel compressor.