Analysis of various power quality phenomena in a highly electrified vessel

Abstract

This paper deals with analyzing and resolving Power Quality (PQ) issues in electric energy systems of ships with extensive electrification. Within this framework, optimized configurations of critical subsystems are studied in depth: shaft generators, thrusters, pods and protection against lightning. The anticipated results obtained from a large scale research project are summarized as aiming at a greener, safer and more reliable ship.

On improving the earthing quality in ship electric energy systems

“…Considering the extensive electrification of all systems onboard in an attempt to make waterborne vessels more efficient (exploiting and managing all available energy sources including renewable, hybrids and batteries in an optimum way) and more environmental friendly, the electric grid reliable and safe operation becomes of predominant importance. Thus, it is anticipated to be proven useful in several case studies where protection is of primary importance, (Prousalidis 2010;Prousalidis and Kourtesis 2013;Prousalidis et al 2014;Kanellos et al 2015;Kourmpelis et al 2015;Spathis et al 2015;Prousalidis et al 2017) Committee, IEC-PAS 80005-3), stipulates that the ship electric network must be galvanically isolated from that of the inland Grid especially in the case of earth faults. This is achieved via a combination of isolation transformers and transformers of wye-delta (Yd) winding connection with the neutral of the wye connection being earthed via a resistor the value of which has to be carefully selected.…”

Experimental investigation of the external lightning protection of ships through impulse voltage tests on a scaled‐down ship model

“…Taking as a motivation the above discrepancies and gaps in the requirements of the standards, especially in the cases of bigger metallic ships such as cruise ships, cargo ships and oil tankers, an experiment was conducted on a scaled-down metallic ship model in order to assess the accuracy of various lightning protection zone models proposed in literature. Impulse voltages are applied successively on the superstructures of the ship model in order to investigate how each of them behaves as a lightning rod [20,21].…”