Load tracking type water supplementing method and system of central heating system

The invention provides a load tracking type water supplementing method of a central heating system. The load tracking type water supplementing method comprises the steps of setting a target pressure PSV; collecting a time period signal t and a heat source load feedback signal LD; collecting a water outlet pressure PAV; comparing the target pressure PSV to the water outlet pressure PAV to obtain a comparison result; forming an execution instruction according to the comparison result, the time period signal t and the heat source load feedback signal LD; and receiving the execution instruction by each water supplementing device and completing the action corresponding to the execution instruction. The load tracking type water supplementing method has the beneficial effects that the time period signal t, the heat source load feedback signal LD and the water outlet pressure PAV are introduced during water supplementing, water supplementing is integrated into time period control and load control, multiple water supp