MODERNIZATION OF ELECTRIC DRIVE OF COMPRESSOR STATION

Abstract

The relevance of the work is caused by the need to modernize various equipment at many old gas compressor stations due to the construction of the «Siberia Power» gas pipeline. The aim of the research is to analyze the operation of electric drive of a compressor unit for pumping natural gas, which is a part of a large gas supply system in Siberia and the Far East, after replacement of a synchronous motor with an asynchronous one. Methods: analysis and synthesis of closed electromechanical systems, mathematical description of the AC drive of the compressor in axes x, y, 0 with the control law U/f2 and taking into account the peculiarities of natural gas «booster» operation in the system of its pumping . In addition, the authors have considered the changes in internal parameters of the executive motor (Siemens company type 1TA2832-4AU01-Z) at increase in supply voltage frequency in the range from 70 to 150 Hz, namely a decrease in active and inductive resistances of stator and rotor windings by 8–12 %, and evaluated the frequency effect on the dynamic performance of the compressor electric drive. Results. The authors have obtained complete automation of natural gas supply and pumping; it was found out that double change in supply voltage frequency results in increase of starting torque by 13 %. It was determined that supply voltage frequency, equal to 136 Hz, was the most optimal, as it allows reducing working currents in the chains of the stator of the executive motor and eliminating the problem of current spikes during start-up, which allowed reducing the consumption of electric energy in the compressor shop by 15–18 %.

Keywords

• gas compressor station
• compressor electric drive
• gas «booster»
• working pressure
• transient time
• modernization