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Both new and existing naval vessels of all sizes face ever-increasing power supply requirements to support advanced mission loads including high power sensors, weapons, and launchers. Adding additional conventional generators to support these loads is infeasible given size and weight constraints and given the pulsed nature of those new loads. Instead, an optimization-based Power Management Controller...
The objective of this paper is to describe the implementation of an innovative agent based architecture of controllers for stand-alone shipboard DC microgrids. The controllers have to regulate voltage to the required level and balance load flow in all converters. In addition, they should maintain a deterministic time frame on the order of a few tens of milliseconds for a system with tens of converters...
This paper represents the development of an intelligent control by applying model predictive control to the power management of a DC-based ship system. In a shipboard power system, the control approach should ensure optimal load sharing among generators while maintaining the DC bus voltage stability. Model predictive control is a promising optimal control which has been proven to be efficient and...
The objective of this paper is to describe the implementation of a distributed and coordinated control system for converters in a shipboard distribution system that provides real-time system optimization. Multiple agents take part in the process to determine optimum power sharing for the converters. Optimal power sharing ensures minimum transmission and distribution loss while enforcing constraints...
Medium voltage direct current (MVDC) system poses an attractive technology for the development of high power all electric ships in the future. The Modular Multilevel Converter (MMC) is a potential candidate to be used as an AC/DC interface in fault current limited MVDC systems. A Controller Hardware in the Loop (CHIL) setup and the experimental setup have been designed for the initial verification...
The search for the optimum architecture for Medium Voltage DC (MVDC) Integrated Power Systems must take into account the short circuit protection in addition to overarching goals of efficiency, survivability and cost effectiveness. A comparison study is performed for architectures with a suitable combination of protective devices and power conversion. This leads also to an optimum MVDC bus voltage...
Robust management of short-circuit faults in MVDC systems must rely on a combination of communication-dependent and communication-independent methods. In one approach, an MVDC system is designed to operate without breakers [1], so both methods rely on coordinated control of power converters and non-fault-breaking mechanical disconnect switches to effect the fault clearance process-fault detection...
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...
Turbine-generator set integrated with the thyristor-based rectifier system provides the dc power for the emerging medium voltage dc (MVDC) shipboard electrical distribution systems. Active foldback via firing-angle control can be implemented in the thyristor rectifier to protect the primary distribution bus, thereby possibly eliminating the bulky dc circuit breakers. This paper presents the detailed...
Electric Ship Power Systems, with integrated ship service and propulsion segments, offer significant advantages to warship designers and particularly so in the context of high and directed energy weapon systems. Practical considerations lead to a mix of prime mover and generator sizes being used but straightforward inter-connection between them leaves each subsystem vulnerable to influences imposed...
In this research, a goal has been to explore the design of the generator for a megawatt level DC power system. Population-based multi-objective optimizations have been performed for several machine/rectifier alternatives, including permanent magnet synchronous machines (PMSMs) with active rectifiers and wound rotor synchronous machines (WRSMs) with active and passive rectifiers. From the optimizations,...
This paper presents work that uses field-programmable gate arrays (FPGAs) to accelerate Simulink simulations of electrical machines on a desktop computer by more than 100 times. These simulations operate and can be modified transparently in the Simulink environment with no FPGA expertise required. This offers the prospect of low-cost, highperformance simulation workstations supporting large simulations...
DC power distribution systems are growing in popularity in applications such as electric ships and hybrid electric vehicles. Stability is a crucial aspect in the design of such systems. Generalized immittance based stability analysis is an established method used in addressing stability considerations. In this work, two improvements to this approach are proposed. The first refinement deals with modifying...
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