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Nowadays more and more pulsed loads and nonlinear loads are carried on the medium-voltage (MVDC) shipboard power system, the pulse and non-linear current in different frequency ranges might induce voltage oscillations on the MVDC bus. In this paper, a novel galvanic isolated bidirectional dc/dc converter based on modular multilevel converter (MMC) with energy storage and dc active power filter function...
This paper demonstrates the usefulness of Power Hardware-in-the-Loop (PHIL) simulation techniques in the stability analysis and control design of a notional MVDC distribution system on an all-electric ship. PHIL simulation provides the capability to split a complex multi-converter system into a software simulated portion and hardware portion at a power interface. Using this technique, a detailed system...
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...
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...
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...
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...
This paper is an overview of the different types of grounding, bonding and alarming systems available throughout the world. There has been much confusion and discussion regarding the preferred method of grounding and bonding of power system on board vessels such as pleasure crafts, cargo and naval vessels. This paper will discuss the pros, cons, advantages and disadvantages of each method. It will...
Fault management in a shipboard, medium voltage dc (MVDC) integrated power system (IPS) is a ship-wide function requiring a rapid and highly-coordinated response of several different protection strategies. This paper describes the design and implementation of a MVDC fault management test bed at FSU-CAPS that is capable of demonstrating the relative performance of candidate MVDC protection techniques,...
In this paper we have described a hybrid automaton based approach towards the development of a simplified Medium Voltage Direct-Current (MVDC) Shipboard Power System (SPS) model. SPS is considered a good subject of hybrid modeling and hybrid control system design as it combines a variety of continuous component dynamics, discrete control actions as well as a variety of switching components. Therefore,...
This paper first puts the challenges from design constraints imposed by mission load requirements on future naval surface combatants into context. Moreover, it provides results from experiments at the three partner universities designed to de-risk emerging medium voltage DC (MVDC) technology based systems and to provide validated models for future systems studies. These experiments are carries out...
To further improve energy management, the US navy is exploring medium-voltage DC as the power supply of choice for next generation integrated power systems (NGIPS). Using the mature technology of multi-pulse thyristor bridge rectifiers, viable topologies are proposed that meet power density expectations. However, due to the non-linear ripple associated with thyristor commutations in such active front-ends...
For many years, the predominant concept on board ships was to have separate propulsion and generator engines. However, more recently, the adoption of hybrid installations with shaft generators, is becoming increasingly common. In this paper, a case study is presented where measurements from actual equipment are used to compare the propulsion and power plants of a typical ship to a hybrid one. Also,...
In this paper, current early-stage design tools are used to produce a notional ship that includes leading-edge weapons and sensors. These new systems stress the capabilities of current design tools and demonstrate the need for tools that can address the increasingly integrated, powerful and heat-producing nature of future payloads. The data produced in this process are shown to be the required input...
In June through October of 2014, power-hardware-in-the-loop (PHIL) simulation testing of a 1.2 MW, 4.16 kV AC / 1 kV DC power conversion module for naval applications was conducted. In these tests, the device-under-test (DUT) was interfaced to a virtual surrounding system that was generally representative of the power system of a future surface combatant. Tests were focused on demonstration of operation...
In this research a general and scalable method is proposed to transform differential-mode circuits into their common-mode equivalents for the purpose of modeling common-mode voltage and current in large, complex power systems. The technique is demonstrated for an example dc-based ship power system and validated against a detailed model.
From local utility grids to electric ships, providing power to an ever increasing variety and magnitude of loads requires power grids that are more flexible, resilient, and efficient than ever before. In many cases, these systems must serve loads that are nearly equal to and occasionally exceed peak generation capacity. As a result, it is critical that these power systems and their controls are analyzed...
There are essentially two kinds of power and propulsion system architectures in use today: Segregated and Integrated. The hybrid architecture combines aspects of both of these into a single ship design. It can also be considered to be partially integrated power system architecture. Dalton [1] describes the trade-offs in selecting power system architectures.
Recent advances in the sensor and weapons systems being installed on US Navy ships and the electrification required to power them are now forcing the engineering community to re-evaluate the effectiveness of the tools and processes now in use. At the same time, over the last decade there have been significant changes in the way that software is architected and developed. User expectations for software...
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