Abstract
Electrical systems of oil production facilities have to meet high reliability and continuity requirements. At the same time, they have a high length of electric networks and specific users such as submersible electric motors. These factors lead to a high sensitivity of the electrical systems to voltage sags. In addition, frequency fluctuations are possible in the power system, which also affect the electrical system stability. The purpose of the article is assessing the electrical systems stability in the case of the voltage frequency change. The mathematical model for stability assessment was compiled in a coordinate system rotating with a voltage frequency. Computations were made for the electrical system of a typical well cluster with PED-110 117 motors, the power supply of which is carried out according to the scheme with double voltage conversion. At the first stage, the frequency change in the nominal operating mode was simulated. The electrical system would be absolutely stable at 47.18 Hz and absolutely unstable at 52.95 Hz. The method based on the area method has been proposed to quantify stability based on frequency constraints. At the second stage, frequency changes according to the linear law that occur simultaneously with voltage sag were simulated. It has been found that linear frequency increase leads to the decrease in the stability margin factor, and frequency decrease leads to its increase. The obtained results can be used to assess the electrical systems stability in the case of voltage and frequency changes.
Keywords
electrical system, stability, submersible electric motor, voltage frequency change, dynamic stability curve, stability margin factor
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