To the problem of reducing the amount of exchange electric power flows between parallel-operating diesel generators of alternating current

The problems associated with mutual flows of electric energy between several alternating current diesel generators during their parallel operation are considered. It is noted that of electrical energy in some cases leads to emergency situations, reduces the efficiency of operation of units and their reliability. Fluctuations in operating parameters cause voltage pulsations, reduce unit efficiency, limit the use of full power, have a negative psychophysiological effect on personnel, and lead to increased wear of rotation speed controllers units. At the same time, if we present the phenomena occurring in the system of parallel diesel generators in a simplified manner, we can provide a scientific understanding of the essence of the processes and develop practical recommendations for ensuring the quality of the energy generated. A mathematical model of two parallel diesel generators is presented, from which it follows that the exchange oscillations are of a single-node form, the node of which is located in the middle of a conditional flexible shaft in the form of an electrical connection connecting the diesel generators. With a significant swing in the amplitude of oscillations, their frequency in various load modes is 2 to 5 Hz. It is close to the frequency of the disturbing forces caused by the working processes in the diesel engine. In a simplified torsion system for parallel operation of a group of diesel generators on a powerful electric network, each unit should be considered as a single-mass torsion system. The natural frequency of a single-node oscillation form has one node in the zone of conditional electrical connection between generators. Resonance oscillations in the system arise due to an unstable working process as a result of unstable operation of the fuel equipment from cycle to cycle. This leads to an increased flow of electrical energy between parallel diesel generators. This phenomenon is usually accompanied by a decrease in the efficiency of the installation as a whole.

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