Review of dynamic positioning control in maritime microgrid systems

For many offshore activities, including offshore oil and gas exploration and offshore wind farm construction, it is essential to keep the position and heading of the vessel stable. The dynamic positioning system is a progressive technology, which is extensively used in shipping and other maritime structures. To maintain the vessels or platforms from displacement, its thrusters are used automatically to control and stabilize the position and heading of vessels in sea state disturbances. The theory of dynamic positioning has been studied and developed in terms of control techniques to achieve greater accuracy and reduce ship movement caused by environmental disturbance for more than 30 years. This paper reviews the control strategies and architecture of the DPS in marine vessels. In addition, it suggests possible control principles and makes a comparison between the advantages and disadvantages of existing literature. Some details for future research on DP control challenges are discussed in this paper

A Hybrid Power System Laboratory:Testing Electric and Hybrid Propulsion

Onboard hybrid power systems with low -emission energy carriers are a promising solution for green shipping replacing conventional diesel engine -based energy systems. However, there are several existing challenges related to these new low -emission energy solutions that need to be investigated. A full-scale infrastructure for testing and verification of such systems is one of the important stepping stones while developing a reliable system. In this article, hybrid power systems for ships and the related controllers were discussed with a focus on the HPS Laboratory at NTNU as an infrastructure for the testing and verification of shipboard dc power systems. A hierarchical control architecture for the power and energy management of the hybrid power system was also detailed. The experimental verification of the energy management system for both the zero -emission and hybrid propulsion mode along with voltage droop power -sharing using the real ship load profile was presented