"Frequency control water supply system" and the general pressure pumping station water supply system is basically the same, but in the "frequency control water supply system" adds a set of control microcomputer and inverter, command "frequency control water supply system" in During operation, according to the actual demand of living water system for water volume and water pressure (that is, the water supply system of large, small and high pressure, low pressure changes) to work, that is, command and control "inverter" to adjust the motor supply frequency, So that the motor driven pump does not follow the "pump characteristic curve" run, but according to the actual water supply system, large and small pressure and high pressure, low variable parameters of variable pressure, variable flow water supply to meet the life of the water supply system requirements. "Frequency control water supply system" is energy-saving equipment. It is the use of "inverter" and "microcomputer" to control the pump in accordance with the actual water parameters of variable frequency speed control water supply, which pumps the curve of excess work through the frequency converter to save the frequency - that is, excess pump flow available, The work of extra head is saved. VVVF has a certain frequency range, pump efficiency curve should be in accordance with the long-term operation of the pump in the high-efficiency zone. Frequency control range should be located in the pump water supply between 25% to 100% (here, regardless of head changes). Less than 25% of the pump water supply, then the pump efficiency will fall into the inefficient area. If the pump runs for a long time in the inefficient area, then the water supply system not only can not save energy, but will waste energy. Therefore, the design of frequency control water supply system, to determine the design flow is a very important point, but not to determine the flow and the design object of the actual water changes in the same range, the ratio of the maximum and minimum flow, with or without adjusting the instantaneous flow Changing facilities and so on. In particular, China's "frequency control water supply system" are mostly used to set up a converter, through the computer control of multiple pumps for frequency control water supply, therefore, in the pump switching process, there will be frequency conversion control converted to power frequency control, the new start Of the pump from zero to variable frequency soft-start water supply and so on a time difference, this time difference will cause the water supply system flow and lift fluctuations (this time difference according to several tests for 36s ~ 180s). The issue of water supply for small flow of water at night should also be considered. In the design of "frequency control water supply system" should consider setting an instantaneous flow rate can adjust the regulatory facilities to stabilize this time difference of flow and lift fluctuations, and to solve the problem of water flow at night.
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