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УДК 621.65:62-531.3:628.1/.2

Bagaev Iurii, Karpov N. V., Usachev A. P.

Specific features of frequency regulation of parallel pumps

Summary

One of the options of energy efficient operation of pumping units at the water and sewage pumping stations under pump impeller speed variation with the help of variable-speed electric drives widely used at present time is considered. One variable-speed electric drive is installed either for a group of operating units or on a single pump. Installing a variable-speed electric drive on each operating unit at first sight seems to be a very expensive measure; therefore more often one electric drive is installed for a group of pumps (2–3 units). However, in this case cavitation processes can arise, the dynamic loa­ding on the pump shaft and bearings can increase, the lifting efficiency can decrease, and in the long run the pump energy efficiency can drop. The data of the theoretic and practical substantiation show that installing variable-speed electric drives on each operating pumping unit provides for weakening of the above-mentioned shortcomings, whereas the energy efficiency improves.

Key words

energy efficiency , pumping station , frequency regulation , centrifugal pump , pump capacity