Electrical efficiency and harmonic distortions with the use of frequency converters on systems of water pumping

The use of frequency converters in induction motor drive centrifugal pumps allows controlling the flow discharge systems provided by pumping through the rotation of the pump. The method of controlling the flow through the pump rotation, in terms of energy efficiency is much more effective in the reduction of electric power consumption and active power demand of the control method done by adjusting the valve opening or register. However, the use of the frequency converter generates harmonic current, which may distort the sine waveform of the supply voltage of electricity supply. In this context, this article aims at showing advantages in reducing the flow in pumping systems with the use of frequency converters, but mainly to show that it is necessary to pay special attention to the harmonics generated with the use of this equipment.