Examination of electrical energy quality of gas condensate field

Abstract

The purpose of this work is to assess the quality of electric energy (EE) of the gas condensate field and propose measures to improve it. The quality of EE is a set of its certain characteristics, at which the power receiver performs the required functions. The low quality of EE leads to a deterioration in the operating conditions of electrical equipment, significant losses in industry, technological and electromagnetic damage. The object of study of this work is the quality of electrical energy of a drilling rig located at the Kazanskoye gas condensate field. The drilling rig is characterized by a sharply variable load schedule and a non-linear load, the main part of which is electric motors. To assess the quality of electrical energy, measurements were made of voltages, currents, active and reactive powers of the overhead line at the input to the drilling rig. The following parameters of EE quality were evaluated: steady-state voltage deviation, negative sequence voltage unbalance factor, zero sequence voltage unbalance factor. The analysis of losses of power and electric energy was carried out. After evaluating the above parameters, the following problems were identified: a high negative sequence unbalance factor and the necessity for reactive power compensation. The high unbalance factor was due to a sharp drop in voltage on account of the operation of the overcurrent protection by reason of the connection of a new load. The solution was applied to recalculate short-circuit currents, select new high-voltage circuit breakers and recalculate relay protection settings. To compensate the reactive power, it was proposed to use a capacitor unit with harmonic filters. The proposed measures effectively reduce power and electrical energy losses and, as a result, the bills for the electrical energy, increase the service life of electrical equipment. An economic evaluation of the proposed measures was carried out.

The purpose of this work is to assess the quality of electric energy (EE) of the gas condensate field and propose measures to improve it. The quality of EE is a set of its certain characteristics, at which the power receiver performs the required functions. The low quality of EE leads to a deterioration in the operating conditions of electrical equipment, significant losses in industry, technological and electromagnetic damage. The object of study of this work is the quality of electrical energy of a drilling rig located at the Kazanskoye gas condensate field. The drilling rig is characterized by a sharply variable load schedule and a non-linear load, the main part of which is electric motors. To assess the quality of electrical energy, measurements were made of voltages, currents, active and reactive powers of the overhead line at the input to the drilling rig. The following parameters of EE quality were evaluated: steady-state voltage deviation, negative sequence voltage unbalance factor, zero sequence voltage unbalance factor. The analysis of losses of power and electric energy was carried out. After evaluating the above parameters, the following problems were identified: a high negative sequence unbalance factor and the necessity for reactive power compensation. The high unbalance factor was due to a sharp drop in voltage on account of the operation of the overcurrent protection by reason of the connection of a new load. The solution was applied to recalculate short-circuit currents, select new high-voltage circuit breakers and recalculate relay protection settings. To compensate the reactive power, it was proposed to use a capacitor unit with harmonic filters. The proposed measures effectively reduce power and electrical energy losses and, as a result, the bills for the electrical energy, increase the service life of electrical equipment. An economic evaluation of the proposed measures was carried out.