Dynamic modeling of a supply vessel power system for DP3 protection system

Abstract

The work is focused on modeling and simulation of a supply vessel from a static and dynamic perspective in an integrated way. Modern marine vessels with electric propulsion are becoming more and more complex systems. Therefore, there is a strong necessity to develop models capable to integrate different subsystems in order to evaluate the overall performance under faults conditions, harsh weather and other critical situations. In particular, the focus of the work is to highlight the need to implement zonal protection scheme to respect DP3 (Dynamic Position 3) constraints in case of severe busbar faults, operating the system with the main tie breaker closed. The model developed is characterized with a complete representation of a Platform Supply Vessel (PSV). The model represents also the full protection system (static and dynamic) in accordance to fine-tuning conducted on the real system. In this work, the innovative contribution is the investigation of the short-term dynamics after a busbar faults with a detailed electric model of the full network taking into account zonal power system protections and load shedding actions. The work is also focused on representing the electromechanical model of the propulsion power converters.