Challenges and proposals regarding determining the number and capacity of electric generators in electric propulsion vessels compared to conventionally propelled vessels.

Abstract

In this research paper, the design dimensions for selecting the number of generators, the nominal capacity of each generator, and the total capacity of the power plant—which is the total capacity of all generators except one—are discussed. Choosing the optimal number poses a significant challenge in terms of design, practicality, and knowledge. It must balance between meeting the maximum electrical power demand and achieving optimal load in terms of specific fuel consumption.

Given that some loads on the marine vessel may change randomly and others out of necessity, this topic falls under mathematical probability calculations to determine the temporal sharing among loads to identify the maximum and minimum values. Failing to properly determine the maximum value will result in an inability to supply the required power, negatively affecting the vessel's functionality and its intended tasks, especially in critical situations that may impact maritime safety. On the other hand, failing to determine the minimum required power will impact specific fuel consumption, thereby having an economic burden that hinders global market competitiveness due to increased operational costs. Additionally, it relates to increased failure rates in diesel engines driving the generator. Given the technological advancements in propulsion systems, the design considerations and rules may differ significantly, necessitating a comparison between traditional and electric propulsion vessels. Some challenges faced by designers in traditional propulsion vessels disappear entirely in electric propulsion but are replaced by other challenges such as the emergence of higher harmonics (in the Fourier sense) and issues related to electromagnetic compatibility. For this purpose, a computational simulation in Matlab was conducted, presenting practical solutions to demonstrate the feasibility of overcoming these issues in modern networks.