Abstract
The use of variable frequency asynchronous drive in sucker-rod pumping units is constrained by the instability of operation under frequent perturbation conditions, such as voltage sags in the oilfield electric networks and pumping unit insufficient equilibrium. In this paper, the improvement of frequency converters are considered by two solutions: firstly, the reconstruction of a direct current link through the boost converter application; and secondly, the reconstruction of a direct current link through the boost converter application and an uninterrupted power supply source utilizing a supercapacitor as the energy storage. The first solution is rated for the depth of voltage sags up to 50%, which account for the majority of disturbances in the oilfield electrical networks. The control scheme for this solution is considered and the peculiarities of operation in networks with voltage 380 V are highlighted. The second solution is effective for voltage dip depths higher than 50%. The formula for determining the capacitance of the supercapacitor is given and the logic for switching uninterruptible power supply system between charge, discharge and standby modes is described with the indication of the settings. In Matlab Simulink the modeling of the proposed solutions for two depths of voltage dips, in particular, for 20% and 50%, is performed. The transient curves of the main parameters, such as voltage, current, power consumption and motor speed were obtained. Analysis of the results confirmed the possibility of using such systems in conditions of disturbances in oilfield electric networks. It is observed that the total harmonic distortions of voltage and current in the supply network increase when boost converter is switched on during periods of voltage dips, which is due to the operating principle of this scheme.
Keywords
sucker-rod pump unit, variable frequency drive, frequency converter, direct current link, pulse commutator, capacitive energy storage, voltage dip, power quality parameters, harmonics, simulation
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