Control system and method for cooling water system of water-cooled central air conditioner

The invention discloses a control system and method for a cooling water system of a water-cooled central air conditioner, and the method comprises the following steps: T1, opening a preset water chilling unit inlet electric valve and a cooling tower inlet electric valve, then opening a corresponding cooling water pump, and operating to an initial value of the total flow L of cooling water; t2, the starting number X of the cooling towers is adjusted according to the relation between the initial value of the total flow L of the cooling water and the lowest uniform water distribution flow of the cooling towers, and the corresponding water chilling units are started; t3, gradually reducing the frequency of the cooling water pump, and judging the frequency reduction stopping time of the cooling water pump according to the total power consumption W01 of the cooling water pump parallel module and the water chilling unit; t4, stopping frequency reduction of the cooling water pump, gradually reducing the frequency of