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The design of an electric ship can be based on several different technologies and architectures, each affecting the design drivers in ways difficult to be foreseen a priori. Moreover, the integration of innovative solutions requires to perform their proof-of-concept, not only related to their proper functioning, but also to their use onboard (assessment of the new system's impact on the main design...
The naval vessels electrification is one of the most important issues to be tackled, because not only it allows a more efficient operation, but also is considered a technological game changer. Indeed, electrification offers improved operational benefits and enables mission systems continuous upgrade. Several technologies can be used, each presenting different impact on ship performance. Thus, instruments...
Nowadays, it is of paramount importance reducing the pollutant emission also of small crafts operating near the coast. This action is an essential issue to preserve the marine and coastal environment. In this paper, the design of a coastal-navigation multipurpose craft to be used in North Adriatic Sea area is presented. The particular service areas are characterized both by inland waterways with shallow...
All Electric Ships (AESs) are becoming a standard for what it concerns large ships with large power requirements (for both propulsion and onboard loads). At present, the design of shipboard complex power system (namely the IPS — Integrated Power System) is done through a well-proven process, relying on historical data and trial-and-error procedures developed in nearly 30 years of design experience...
Safe Return to Port (SRtP) regulation entry into force introduced new concepts and requirements for large passenger ships (constructed on or after 1st July 2010, having length of 120 meters or more, or having three or more Main Vertical Zones) deeply affecting their design. In fact, the need of assuring a certain level of service also in case of fire or flooding events (within certain limits) caused...
Nowadays, the Medium Voltage Direct Current (MVDC) technology represents a new possibility to renew the shipboard power system of large All Electric Ships (e.g. cruise liners or military vessels.). This new concept is capable of achieving valued advantages, such as simplified system integration, modularity and system efficiency, together with an expected reduction of the space devoted to technical...
DC distribution is a promising technology for addressing incoming issues in AC conventional distribution. In marine power systems, given the high power requirements of electric propelled vessels, Medium Voltage DC (MVDC) distribution is on study. Among all the relevant issues of DC distribution, short circuit currents definition and interruption is the most problematic now. Rail-to-rail faults are...
The increasingly presence of HVSC connection onboard ships opens the path for innovative applications, such as ship-to-shore connection. Indeed, it is possible to supply power to land during emergency (mainly to deployed camps/bases), thanks to the electric power generation capabilities of modern all electric ships. However, the use of the same system to provide both the HVSC and ship-to-shore connection...
The increasing complexity of ship's Integrated Power Systems (IPSs) led to the need of a review of conventional design process. Moreover, several stakeholders influence ship design, each of them aiming to protect its own interests, in particular when responsibility of accidents has to be defined. Dependability could be the tool to modify conventional design, transforming it into a dependability oriented...
Recent advancements in power electronics are making it feasible to build high power DC distribution systems. Their adoption is expected to bring new solutions in terms of Power Quality and integration of energy storage systems and electronic drives on board. The increasing interest in high-power onboard applications, such as in ships or railway transportation, led to the rise in voltage levels, which...
The increase in installed power onboard ships and the adoption of electric propulsion led to the need of a rather complex power system. The so-called Integrated Power System (IPS) feeds all the ship loads, integrating into a single entity the functions of generation, regulation, distribution and utilization of the electric power. The integration, thus being a powerful tool to increase vessel's performance,...
Dependability has only recently become a unified theory, developing its own taxonomy, lexicon and methods. This newly formed discipline now regroups concepts defined and developed within international rules corpus in different areas of engineering, such as: aerospace, automotive, computing, etc. Applications to marine sector are, at present, partial, lacking in terms of systematic approach and limited...
The paper presents the Naval Smart Grid (NaSG) research project, concerning the study of an Integrated Power System (IPS) for Italian Navy All Electric Ships (AESs) with control and reliability characteristics. Aim of the research is to produce results useful for a new ship design, endowed with the following innovative features: modular power system; subsystem's flexible integration; efficiency improvement;...
The training tall ship Amerigo Vespucci is the masterpiece of the Italian Navy fleet. Counting about 80 years of service, its refitting was mandatory, due to severe critical issues in efficiency, sustainability, logistic management and operation safety. Taking advantage of the full renewal, an innovative propulsion system has been designed. In this paper the new power system configuration, the requirements,...
MVDC distribution systems are proving to be a very promising research topic, given the large number of studies proposed in the academia and in the navies worldwide. In this paper authors present some multi-machine MVDC distribution system architectures, exploiting and comparing a range of choices on the topic of voltage control. Three network topologies are presented and analyzed, applying a series...
The new simulator of the FREMM (European Multi Mission Frigates) electric Integrated Power System (IPS) is treated in this paper. The simulator, recently delivered by the University of Trieste to the Italian Navy, is utilized to study relevant electromechanical transients of the on board IPS. In particular, this simulator is employed in verifying some automated sequences and restore maneuvers, which...
Power quality is a key issue in islanded electric power systems. Considering the intrinsic weakness of islanded grids, this paramount aspect is not of easy accomplishment. To fulfill power quality requirements in these weak electric systems, high performance voltage and frequency controls are needed, although the interactions between these controls can lead to stability issues. In particular, frequency...
The degree of complexity of Integrated Power Systems (IPS) for All Electric Ships (AESs) points out the need to review the design process from a dependability perspective. This paper suggests the application of dependability concepts and definitions to accomplish to requirements set by recent rules and regulations in the field of threat levels for shipboard electrical equipment. Guidelines about 1)...
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