Ciontea, Catalin-Iosif

Industrial PhD DEIF A/S 

PROJECT TITLE: Adaptive Protection for Medium Voltage Marine Applications

PhD period: 2015.02.01 – 2018.01.31. (has been prolonged till 2018.07.31)
Section: Electric Power Systems
Research programme: Modern Power Transmission Systems
Supervisor: Claus L. Bak
Co-Supervisor: Frede Blaabjerg
Contact information

Collaborator: DEIF A/S.
Funding: InnovationsFonden - Denmark.


Protection of the electric power network represents the technology that isolates the faulty component from the rest of the grid during the fault conditions in order keep the system stable, to avoid human casualties and equipment damage. The definition is fully valid for the land grid-tie applications, as the national power system, but in marine applications the priority is the continuous operation of the essential devices regardless of the system conditions. In literature, this concept is called “survivability” and is achieved by:

- utilization of several distributed generators to power-up the vessel
- flexible architecture of the distribution network, so in faulty conditions the power can be transmitted to a load or evacuated from a generator using alternative paths
- zonal ship design, which means that the vessel is divided in several zones in which the equipment’s operation is not affected by malfunctions that appears into a different zone

In order to achieve the survivability condition, the protection system needs to clear the faults and to ensure uninterruptible power supply to the essential loads (propulsion system, navigation devices, communication system and others) of the ship. Usually, the adaptive protection implies existence of a central control unit that monitors the network status, changes the relay settings or reconfigures the grid topology. However, the zonal ship design suggests that adaptive protection using a single central control unit should be avoided in order to meet the survivability condition and a new decentralized adaptive protection method needs to be approached.

The PhD project will be focused on development of an intelligent protection system for marine applications that can offer improved functionalities compared to the actual protection solutions, with emphasize on the 3-phase, medium voltage, resistive grounded or ungrounded systems. In order to achieve the desired objective, different approaches and methods will be investigated, developed and tested.

It is expected that the novelty of this study will improve ship security by improving protection systems and new commercial products used in the marine protection technology will emerge.


Publications in journals and conference papers may be found at VBN