A possibility of energy recovery in the electric drive of crude oil pumping units

Abstract

The electric drives of Canadian-type beam pumping units have a special operation, in the sense that in the same pumping cycle the electric machine works as an energy-absorbing motor, but also works as a generator dissipating significant energy. A technical possibility to achieve a variant of energy recovery during the periods of dynamic braking of the electric drive system of beam pumping unit is the utilisation of a rechargeable battery, and the performed simulations proved the validity of this solution. An attractive operating hypothesis is the operation of pumping unit in parallel on a single power supply with a common DC bus. In this case, not all of the recovered energy contributes to recharging the rechargeable battery, but part of it is reused by the other pumping units. The particular case analyzed refers to two pumping units connected in parallel and results obtained are edifying.