Abstract
The article is concerned with the issues related to the implementation of the group self-starting electric drives of the head pump units at the oil pumping station. Since oil pumping stations are high-risk facilities, this problem is particularly urgent for them because of the stringent requirements for the continuity of the processes of pipe-wire transportation of oil and oil products.
The self-start of a group of electric drives of mixed composition in the ETAP software package for the existing oil pumping station has been studied and simulated. The task of ensuring the self-starting of electric motors of precisely a large unit power is considered in order to study their mutual influence on each other. As a result of conducting multiple model experiments, the values of the voltage of static stability and the time of dynamic stability of the electrical system of the enterprise were determined. On the basis of the data obtained, the boundary of the dynamic stability of the system has been built, the optimal conditions for the implementation of group self-starting have been determined, compliance with which allows uninterrupted operation of oil pumping stations during voltage dips in the external power supply system. Particular attention is paid to assessing the settings and the selectivity of existing devices for relay protection and automation since only with their correct detuning, self-starting can expand the area of stable operation of the electrical system and keep electric drives of main pumping units in operation after power failures.
On the basis of the performed analysis, a variant of protection of the minimum voltage was proposed taking into account all the features of the implementation of self-starting electric drives of mixed composition at the pump station under consideration. The absence of an abrupt change at the time of dynamic stability is established for an electrical system of mixed composition with electric drives of high unit power at comparable powers of asynchronous and synchronous motor loads. The bifurcation point on the border of dynamic stability is preserved.
Keywords
Self-start, electrical system of mixed composition, oil pumping station, stability, synchronous electric motor, asynchronous electric motor, undervoltage protection, simulation, automatic transfer of reserve, ETAP software.
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