Control Method and Apparatus for Water Pumps in Air Conditioning System, and Air Conditioning System

A control apparatus for a water pump in an air conditioning system, wherein the air conditioning system comprises a plurality of water pumps in parallel, and the control apparatus comprises:

• an acquisition module, configured to acquire a number of the plurality of water pumps currently running in the air conditioning system, and a current rotation speed ratio and a current running lift of the water pumps;
• a calculation module, configured to calculate a control range of a rotation speed ratio according to the number and the current running lift;
• a determination module, configured to determine whether the current rotation speed ratio is in the control range of the rotation speed ratio;
• and
• a control module, configured to switch the number of the plurality of water pumps to enable the rotation speed ratio of the water pumps to fall within the control range of the rotation speed ratio if the current rotation speed ratio is not in the control range of the rotation speed ratio, and to control the water pumps currently running to continue synchronous frequency conversion and speed regulation if the current rotation speed ratio is in the control range of the rotation speed ratio.