Power Supply Systems of Drilling Rigs with an Ensemble of Odd-Fold Current Harmonics in a Single-Reactor Compensating Device of a Twelve-Phase Rectifier Unit

Abstract

The subject of this work is power supply systems (PSS) of drilling rigs of an oil-and-gas extracting complex with a frequent electrical drive of basic equipment and a general diode rectifier unit. The requirements for these systems are formulated. It is suggested to use principles applied in FACTS while building such PSS. To this end for compensating longitudinal inductive reactance of systems advisability of using symmetric compensated rectifier units as a general rectifier is shown. A variant of such unit with an ensemble of odd-fold current harmonics in a single-reactor compensating device is suggested. Some work characteristics of the unit are explained on the basis of electromagnetic process analysis. Voltage control methods in PSS are considered. It is shown that with a relatively short distance of drilling rigs from a decreasing substation for voltage control autotransformer control can be used either in the beginning of the power transmission line or in its cutting. For super-distance drilling rigs it is necessary to use either electronic vector control in the beginning of a power transmission line or autotransformer control in the beginning and in the end of the line. Scheme decisions of PSS and the results of constructive and design development of a compensating device reactor of a rectifier unit are given.

Keywords: power supply system, drilling rig, ensemble of odd-fold current harmonics, reactor, compensating device, twelve-phase rectifier unit, constructive decision, design.