The optimal running state parameters of water ring vacuum pump can be obtained by numerical simulation using the exhaustive method. Under the design condition of pipe network impedance S, water ring vacuum pump is given a certain differential pressure value, will be two parallel pump all satisfy the differential value of speed combination solution, then calculate combinations corresponding to the total power of each group of rotational speed, and finally find the smallest set of total power speed combination, namely the optimal rotational speed to meet the conditions of water pump combination, further to find out the optimal speed ratio distribution and similar working point. Given the pipe network impedance S, when different pressure difference set value requirements are met, the optimal speed ratio of parallel pumps is a certain value, which is the same as the optimal speed ratio calculated by using criterion 3. The similar working points of the parallel water pump remain unchanged, which are the same as the similar working points calculated by using criterion 2. On the other hand, in the design and selection, the estimation of pipe network impedance is relatively large, or multiplied by a safety factor greater than 1, which will lead to relatively large pump selection.
Therefore, the above conditions rarely appear in the actual conditions. If this condition occurs, the current frequency converter can achieve overfrequency operation, that is, the frequency converter output frequency is more than 50Hz power frequency, but the bearing capacity of the pump motor should be considered. In addition, if conditions do not allow, in the face of such unusual conditions, the system needs to be given priority to ensure that the program can not run in accordance with the optimal speed. Aiming at the rotating speed of variable frequency pumps in parallel in closed circulating water system optimal control problem, the characteristics of variable frequency pumps in parallel model is established, through theoretical analysis, summed up the parallel construction rule of variable frequency pump speed optimization control whole month total amount of cooling by BMS history recorded in the building air conditioning system running data calculated hourly, historical operation data including air conditioning temperature of total water supply, building air conditioning cold water total return water temperature and building air conditioning cold water to total water flow.
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