Two-stage enthalpy-increasing compressor control method

The invention discloses a two-stage enthalpy-increasing compressor control method, belongs to the field of heat pump unit control methods and solves problems that an existing control method leads to the fact that an enthalpy-increasing pipeline carries liquid and the like. The method includes that an enthalpy-increasing electromagnetic valve is closed after a unit is started, and the enthalpy-increasing electromagnetic valve is started when start-up conditions are satisfied; the start-up conditions lie in that the volume of liquid in an economizer is less than or equal to 40% of that of the economizer, or superheat degree of a water-side heat exchange outlet is greater than a set value of A1, and the holding time is greater than a set value of A2. The enthalpy-increasing electromagnetic valve is closed after the unit is started and is started after the start-up conditions are satisfied, in other words, the enthalpy-increasing electromagnetic valve is started after running safety is ensured, problems that the enthalpy-increasing pipeline carries the liquid resulting in breaking of compressor parts are solved, and service life of the compressor is prolonged.