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The following topics are dealt with:electric ship; electrical machines; system architecture; power conversion; reconfiguration; survivability; power semiconductors; shipboard power systems; propulsion; fault detection; testing and certification; energy storage and management; and power quality.
Quality of Service (QOS) is a measure of the ability of the power system to reliably provide loads electrical power with the power continuity required by the loads. QOS recognizes that different loads can tolerate different power interruption durations. This paper reviews QOS concepts as described in IEEE 1662-2008 and IEEE 1709-2010, describes methods for employing QOS in the design of shipboard...
A new type of electric boat named "RAICHO-I" has been created by Tokyo University of Marine Science and Technology. "RAICHO-I" utilizes a lithium-ion battery with a plug-in system or a quick charging system. "RAICHO-I" is the first electric boat adopted CHAdeMO standard which is the standard of quick charging method for electric vehicles in Japan. A quick charger can...
A new type of quick charging plug-in electric boat named "RAICHO-I" has been created by Tokyo University of Marine Science and Technology. "RAICHO-I" is the first electric boat adopted CHAdeMO standard which is the standard of quick charging method for electric vehicles in Japan. However, the operational time, speed and distance of electric boats are restricted since the loaded...
This paper introduces an alternative to traditional design approach - a design which provides the system components with the rules of interaction (invariants) and uses computational resources already available in the controller to implement these rules. We obtain rules of in-system interaction by analyzing power sharing in m-paralleled connected power sources feeding a complex load. We illustrate...
The Navy Electronic Motor Operator, a next generation shipboard control product is discussed. The product's modularity, network capability, programming flexibility is highlighted. Key testing data from qualified products list (QPL) testing is included. Some of the product applications are expanded upon herein.
The reduced cost of semiconductors makes the use of power-electronic elements like IGBT cost-effective: More and more power-electronic systems are used. The increased number of converters changes the overall behavior of electrical grids. It has been demonstrated that the interaction between the converters (and thus between the controls) may cause instability in the grid. Thus it is very important...
Initial design considerations of shipboard power distribution grids require a priori load dynamics assumptions for size assessment, power/energy requirements, and system stability considerations. For the analysis of dc micro-grids, power processing units and dynamic loads are often assumed destabilizing constant power loads for simplified stability studies. The constant power load is shown to be valid...
Quantifying the close relationship between shipboard thermal, mechanical, and electrical sub-systems is of fundamental importance to understanding the nature of a large, integrated system like the all-electric ship (AES). Our research efforts in support of development of an AES are focused on physics-based, dynamic models of components and subsystems that approximate, at the system-level, the notional...
High availability is a major concern in naval drive applications. In consequence, multiphase machines, e.g. IM with double-star stator windings, are used. To guarantee the high availability, comprehensive scenario-based analyses of the machine-control behaviour in case of faults have to be performed. Asymmetrical faults - which are a practical issue - are not featured by any simplified single-phase...
A 15kW Brushless DC (BLDC) motor drive system suitable shipboard applications has been developed. This platform meets shipboard interface requirements with low cost and high power density. It consists of a Pulse-Width Modulated (PWM) Current Source Rectifier (PWM-CSR) and front end Voltage Source Inverter (VSI) modules feeding a high efficiency PM Motor. Converter modules can be interchanged in order...
In this paper, a method for removing the risk associated with the testing and development of novel drive system topologies, prototype electric machines, advanced control system strategies, or a combination of the aforementioned without using any real motors/generators is presented. For low power machines, the test platforms are relatively inexpensive and accessible, however, as power levels increase...
In this research, a magnetic equivalent circuit (MEC) model for population-based design (PBD) of salient-pole wound-rotor synchronous machines (WRSMs) is derived. The model includes a unique approach to represent fringing flux to the rotor poles based upon observations of flux paths seen in finite element solutions. In addition, the airgap flux tubes are simplified by including rotor fringing as separate...
With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in naval applications. Excellent torque dynamics are important in these applications - they allow meeting additional demands due to electrical system stability. Dynamics are limited by the rating and the switching frequency of the converter...
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