Abstract: To address the contradiction of insufficient water supply pressure in residential communities, variable frequency drive (VFD) speed control technology is adopted to maintain constant water supply pressure, thereby saving energy and reducing equipment maintenance. Keywords : Residential community, high-rise building, water supply pump station, VFD, energy saving control 1 Overview The development of modern residential communities often integrates living, commerce, and production in a specific area. With the increase in building height, the problem of water supply for both production and daily life has become increasingly prominent, mainly reflected in two aspects: firstly, the constant pressure water supply for domestic use; and secondly, the pressure water supply for fire hydrants in high-rise buildings and automatic sprinkler systems in shopping malls. In the 1980s and 1990s, the water supply system of each high-rise building consisted of two groups of pumps: one for domestic use and one for fire protection, with each group having two pumps, one in use and one on standby, mutually redundant, using traditional open-loop relay control. When the mains frequency voltage directly supplies water, due to the frequent changes in user water usage, both insufficient and excessive water supply occurred frequently. The imbalance between water supply and demand is primarily reflected in the water pressure. In this case, the control system can only control the water level, not the constant pressure required for water usage. This leads to situations where high-rise residents have no water during peak water usage times, and the water quality is poor. Furthermore, "water hammer" occurs in the pipes when the pumps start and stop. In addition, there are problems such as large unit footprint, severe noise interference, high energy consumption, and the need for manual operation, which are clearly unsuitable for the needs of modern residential communities, and the water quality cannot be guaranteed. If the production, domestic, and fire-fighting water pumps in the residential community are centralized to form a "one-operation, two-supplement, one-standby" water supply pumping station (as shown in Figure 1), and a frequency converter is used to control the pump speed to maintain a constant water pressure, a balance can be maintained between water supply and demand. That is, when demand is high, supply is high, and when demand is low, supply is low, thereby improving the quality of water use. [b][align=center]For more details, please click: Application of Variable Frequency Speed ​​Control Technology in Residential Community Water Supply Pumping Stations[/align][/b]