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Pulse power loads are assuming increased importance in the development of all-electric naval surface combatants. One possible means for countering the potentially destabilizing effect of pulse loads is by manipulating the power of the propulsion motors to smooth out the variations in system power caused by the pulse loads. Hardware-in-the-loop experiments were conducted with the 2.5 MW motor-dynamometer...
Current sizing algorithms for warship power generation and fuel tank capacity were developed over forty five years ago when ship service loads were a small fraction of the overall power demand. Electric load growth, particularly with the introduction of high power mission systems, results in ship service maximum margined loads being nearly the same as the maximum propulsion load. In many operating...
This paper set out to describe the electric ship technology demonstrator and how it is being used to de-risk future technology. The main purpose of the project is to stretch the technology boundaries and extend the understanding. To this end the project is a success with the facility fully integrated and operating as an advanced system.
In recent years integrated full electric propulsion (IFEP) has become a popular power system concept within the marine community, both for the naval and the commercial community. In this paper the authors discuss the need for a detailed investigation into the impact of different IFEP power system architectures on the availability of power and hence on the survivability of the vessel. The power system...
In military applications, it is important for a platform (warship, aircraft, etc.) or an installation (airbase, etc.) to maintain war fighting ability after being damaged. In particular, if the unit requires electric power, cooling, or other resources to perform its mission, then these resources must be available following a weapon detonation event. The integrated engineering plant is responsible...
The LHD 8 amphibious assault ship (Makin Island) is currently under construction at Northrop Grumman Ship Systems, in Pascagoula, MS. A hybrid propulsion plant, in which the ship has the capability to be propelled by electric propulsion motors or gas turbine engines, exists aboard LHD 8. The electric propulsion motors provide for totally-electric propulsion for the majority of Makin Island's operation...
This paper studies the large-signal stability of a synchronous generator connected to a motor drive of a similar power. The generator-motor drive set, with additional auxiliary lower power loads represents a simplified version of an all electric ship power system. The use of Lyapunov linearization method allows identifying the region of stable operation. This description is valid only locally. However,...
Impedance characteristics of shipboard power systems provide important information for studies on system stability and integration. Existing injection based impedance measurement techniques require multiple tests on the system to obtain characteristics over wide frequency ranges. In this paper, recurrent neural networks (RNNs) are used to model the small signal dynamics of power electronic systems...
Software time-domain simulation models are useful to the naval engineering community both for the system design of future vessels and for the in-service support of existing vessels. For future platforms, the existence of a model of the vessel's electrical power system provides a means of assessing the performance of the system against defined requirements. This could be at the stage of requirements...
Electric propulsion for cruise liners has now become a standard owing to its several advantages. However propulsion drives have a large impact on the ship power system. This gives rise to the requirement for designers to understand in depth the effects of propulsion drives on the ship network in different operating conditions. For this purpose computer simulations have proved to be a very useful tool...
The design of an integrated electric propulsion (IEP) system is considered for naval submarine propulsion. A multi-objective genetic algorithm is used to explore potential IEP topologies and designs, including direct-drive, geared-drive and hybrid steam-turbine/electric drive. Typical submarine mission scenarios are simulated and trade-offs in performance are investigated. Compromises in propeller...
This paper presents a thrust loss suppression algorithm in an electric propulsion ship. From the viewpoint of the speed controller of the propulsion motor, the thrust loss due to cavitation can be regarded as a disturbance torque. The disturbance torque is estimated by means of a disturbance observer. Considering the estimated disturbance torque, the speed reference of the propeller is modified to...
This paper reports on the simulation of a marine Integrated Electric Full Electric Propulsion (IFEP) system to assess its ability to absorb variations in propulsion or auxiliary load without excessive degradation of the electrical supply quality or imposing excessive demands on the prime movers. IFEP systems are expected to yield economic benefits to ship operators by permitting the capacity of ship...
Software is to an increasing degree delivering value to the maritime industry through, e.g., optimized energy use, prolonged equipment life, bridge decision support, integrated control systems, alarm systems, and emergency shut-down systems. However, as the amount of software onboard vessels increases, so does the possibilities for undependable vessel behavior. Based on research performed in cooperation...
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