Investigation of Resonance Effect in the Oil Production Electrotechnical Complex with the Downhole Reactive Power Compensator

Abstract

At present, there is not a single complex technological facility, which would not have been introduced frequency-controlled electric drive. However, the frequency converters use in oil production for driving electric submersible pumps leads to a deterioration in the electrical energy quality. The current and voltage curve's shape is distorted. The higher harmonic components emerge there. The higher harmonic components can lead to resonance effects in the electrotechnical complex of the electric submersible pump installation. Its consequence is the failure of electrical equipment. The purpose of the article is to study the resonance effects in the electrotechnical complex of the electric submersible pump installation equipped with a frequency-controlled electric drive. The equivalent circuit of the electrotechnical complex with the downhole compensator of reactive power is developed for the oil production. There is a mathematical model on its basis which is used for the resonance effects study. The amplitude-frequency characteristics of the voltage at the complex elements' inputs and the phase-frequency characteristic of the circuit “CL-DRPC-SEM” are given. It is established that at frequencies of 324 Hz and 328 Hz there is an excess of the input harmonic signal by 1.7 and 1.8 units, respectively. It reciprocally happens in the studied electrotechnical complex of the electric submersible pump installation.