Abstract
The approaches that ensure the trouble-free operation of marine power system in abnormal modes were considered. Such modes are usually associated with the system elements failure during operation. Particular attention was paid to the processes occurring in the circuit during transition of one of the generators to the motoring operation mode. The relevance of the considered marine power system issue was substantiated. According to the research results, using time-delay when generating a signal to disable a failed unit operating with reverse power can contribute to defect development in the primary motor. Moreover, time-delay can also lead to zero voltage in the marine electric power system. This circumstance creates the possibility of an emergency that can potentially lead to a shipping accident with the most serious consequences. The problem of timely shutdown of a faulty electrical machine before its transition to the motoring mode is defined in the research, as well as the overload prevention problem for primary motors remaining in working condition. An original diagnostic indicator was proposed based on study, which allows identifying the inoperative state of generator unit during operation. The new approach was developed, which implements the preventive control method for the marine power system in case of element failure. The forecasting of the system operation modes in case of a generator set failure, and its structural adaptation to the occurred malfunction is carried out. In contrast to the existing methods, the practical implementation of the proposed solution will allow accident-free transition of marine power system to a partially operational state without the emergency. This will have a beneficial effect on the safety of ship as a whole.
Highlights
Marine electrical power systems (MEPS) perform demanding functions for providing electrical energy to onboard power consumers
Let us consider the method of protecting the generator sets (GS) from the transition to the motoring mode, which is widely used by companies across the world
The reverse power value is used as a diagnostic indicator [9, 10]
Summary
Marine electrical power systems (MEPS) perform demanding functions for providing electrical energy to onboard power consumers. Recent years have been characterized by the rapid development of various approaches implementing Smart Grid technology (intelligent grids) in order to improve efficiency of energy resources use [4, 5] According to this concept, it is assumed expedient to place generator sets (GS) and low-voltage switchgears, known as distributed generation plants (DGP), in close vicinity to consumers [6,7,8]. It is assumed expedient to place generator sets (GS) and low-voltage switchgears, known as distributed generation plants (DGP), in close vicinity to consumers [6,7,8] These plants can operate in parallel with a higher-level electric power system or independently provide power supply to the consumers assigned to them, realizing the so-called island operation mode. This feature boosts more active research in this area of the electric power industry
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