Peculiarities of parallel operation of diesel-generator units of a ship power plant

The study of the operation of power stations existing on ships shows the need to ensure reliable parallel operation of diesel generators (DGs). It is known that the main reason for the unstable parallel operation of the DG is a small or different droop of the mechanical characteristics of the drive motors. A study of the parallel operation of diesel generator sets at a ship power plant, consisting of four generators with electronic speed controllers that provide the necessary droop, also showed its instability. The measurements and consideration of physical processes revealed an uneven distribution of reactive power due to differences in the external characteristics of the generators. The elimination of instability is possible only by introducing additional devices and fine-tuning the regulators to obtain the external characteristics of generators with the similar droop. The trouble-free operation of the proposed system was confirmed by long-term tests during the operation of the ship in normal mode during navigation.