scholarly journals Large-Scale Electric Propulsion Systems in Ships Using an Active Front-End Rectifier

2019 ◽  
Vol 7 (6) ◽  
pp. 168
Author(s):  
Hyeonmin Jeon ◽  
Jongsu Kim ◽  
Kyoungkuk Yoon
Keyword(s):  
Phase Angle ◽  
Electric Propulsion ◽  
Large Scale ◽  
Measurement Data ◽  
Propulsion System ◽  
Propulsion Systems ◽  
Zero Crossing ◽  
Electric Propulsion System ◽  
Front End ◽  
Harmonic Content

In the case of the electric propulsion system on the vessel, Diode Front End (DFE) rectifiers have been applied for large-sized ships and Active Front End (AFE) rectifiers have been utilized for small and medium-sized ships as a part of the system. In this paper, we design a large electric propulsion ship system using AFE rectifier with the proposed phase angle detector and verify the feasibility of the system by simulation. The phase angle derived from the proposed phase angle detection method is applied to the control of the AFE rectifier instead of the zero-crossing method used to detect the phase angle in the control of the conventional AFE rectifier. We compare and analyze the speed control, Direct Current (DC)-link voltage, harmonic content and measurement data of heat loss by inverter switch obtained from the simulation of the electric propulsion system with the 24-pulse DFE rectifier, the conventional AFE rectifier, and the proposed AFE rectifier. As a result of the simulation, it was confirmed that the proposed AFE rectifier derives a satisfactory result similar to that of a 24-pulse DFE rectifier with a phase shifting transformer installed according to the speed load of the ship, and it can be designed and applied as a rectifier of a large-sized vessel.

scholarly journals Comparison of Diesel-Electric with Hybrid-Electric Propulsion System Safety Using System-Theoretic Process Analysis

2019 ◽  
Author(s):  
V Bolbot ◽  
G Theotokatos ◽  
E Boulougouris ◽  
D Vassalos
Keyword(s):  
Electric Propulsion ◽  
Process Analysis ◽  
Hazard Analysis ◽  
Propulsion System ◽  
Cruise Ship ◽  
Propulsion Systems ◽  
Electric Propulsion System ◽  
Automation And Control ◽  
Hybrid Electric ◽  
And Control

Cruise ship industry is rapidly developing, with both the vessels size and number constantly growing up, which renders ensuring passengers, crew and ship safety a paramount necessity. Collision, grounding and fire are among the most frequent accidents on cruise ships with high consequences. In this study, a hazard analysis of diesel-electric and hybrid-electric propulsion system is undertaken using System-Theoretic Process Analysis (STPA). The results demonstrate significant increase in potential hazardous scenarios due to failures in automation and control systems, leading to fire and a higher number of scenarios leading to propulsion and power loss in hybrid-electric propulsion systems than on a conventional cruise-ship propulsion system. Results also demonstrate that STPA enhancement is required to compare the risk of two propulsion systems.

scholarly journals Validation of a Test Platform to Qualify Miniaturized Electric Propulsion Systems

Aerospace ◽  
2019 ◽  
Vol 6 (9) ◽  
pp. 99 ◽  
Author(s):  
Fabrizio Stesina
Keyword(s):  
Electric Propulsion ◽  
Can Bus ◽  
Propulsion System ◽  
Chemical Contamination ◽  
Propulsion Systems ◽  
Electric Propulsion System ◽  
Future Space ◽  
Test Platform ◽  
Electro Magnetic ◽  
Exchange Data

Miniaturized electric propulsion systems are one of the main technologies that could increase interest in CubeSats for future space missions. However, the integration of miniaturized propulsion systems in modern CubeSat platforms presents some issues due to the mutual interactions in terms of power consumption, chemical contamination and generated thermal and electro-magnetic environments. The present paper deals with the validation of a flexible test platform to assess the interaction of propulsion systems with CubeSat-technologies from mechanical, electrical, magnetic, and chemical perspectives. The test platform is a 6U CubeSat hosting an electric propulsion system and able to manage a variety of electric propulsion systems. The platform can regulate and distribute electric power (up to 60 W), exchange data according to several protocols (e.g., CAN bus, UART, I2C, SPI), and provide different mechanical layouts in 4U box completely dedicated to the propulsion system. Moreover, the data gathered by the onboard sensors are combined with the data from external devices and tools providing unprecedented information about the mutual behavior of a CubeSat platform and an electric propulsion system.

Performance Analysis of Ground-Based Static Test for Hydrogen Fuelcell Propulsion System

2013 ◽  
Vol 393 ◽  
pp. 510-515
Author(s):  
Norhisyam Jenal ◽  
Wahyu Kuntjoro ◽  
Thomas Arthur Ward ◽  
Khairul Imran Sainan ◽  
Firdaus Mohamad
Keyword(s):  
Fuel Cell ◽  
Electric Propulsion ◽  
Alternative Energy ◽  
Power Source ◽  
Propulsion System ◽  
Propulsion Systems ◽  
Promising Alternative ◽  
Static Test ◽  
Electric Propulsion System ◽  
Aircraft Application

Combustion engines are increasingly being regarded as unsustainable in the long-term, because of their negative impact on the environment (e.g. pollution, green-house gas production, and global warming). This has generated worldwide interest in propulsion systems based on renewable alternative energy sources for the future. Fuel cell technology is a promising alternative power source because of their high specific energy, efficiency, and reliability. Hydrogen proton exchange membrane fuel cell (PEMFC) in particular produces zero carbon emissions by having only water vapor as the exhaust. Although there has been much research by automotive industries in developing fuel cell hybrid electric vehicles (FCHEV), fuel cell research for aircraft application is relatively new. Therefore, there is a pressing need for research related to development of aircraft fuel cell electric propulsion systems. Universiti Teknologi MARA (UiTM) is conducting static experiments on different configurations of fuel cell electric propulsion systems. The objective of this study is to understand the behavior of a PEMFC propulsion system under a ground-based static test. A 1 kW PEMFC was used as the main power source for a brushless DC motor electric propulsion system. The electrical characteristics, rotational speed, and thrust data were presented for two different electrical propellers. Analyses of the results were used to characterize the effectiveness of the fuel cell system and its balance of plant. The results were beneficial as a predictive method on defining the optimum electric propulsion system performance needed for future actual flight development.

scholarly journals Comparative Analysis and Optimization of Technical and Weight Parameters of Turbo-Electric Propulsion Systems

Aerospace ◽  
2020 ◽  
Vol 7 (8) ◽  
pp. 107 ◽  
Author(s):  
Mykhaylo Filipenko ◽  
Stefan Biser ◽  
Martin Boll ◽  
Matthias Corduan ◽  
Mathias Noe ◽  
...  
Keyword(s):  
Electric Propulsion ◽  
Propulsion System ◽  
Aviation Industry ◽  
Total Efficiency ◽  
Efficiency Gain ◽  
Propulsion Systems ◽  
Electric Propulsion System ◽  
Reduce Emissions ◽  
Passenger Aircraft ◽  
Mission Profile

According to Flightpath 2050, the aviation industry is aiming to substantially reduce emissions over the coming decades. One possible solution to meet these ambitious goals is by moving to hybrid-electric drivetrain architectures which require the electric components to be extremely lightweight and efficient at the same time. It has been claimed in several publications that cryogenic and in particular superconducting components can help to fulfill such requirements that potentially cannot be achieved with non-cryogenic components. The purpose of this work was to make a fair comparison between a cryogenic turbo-electric propulsion system (CEPS) and a non-cryogenic turbo-electric propulsion system (TEPS) on a quantitative level. The results on the CEPS were presented in detail in a previous publication. The focus of this publication is to present the study on the TEPS, which in conclusion allows a direct comparison. For both systems the same top-level aircraft requirements were used that were derived within the project TELOS based on an exemplary mission profile and the physical measures of a 220-passenger aircraft. Our study concludes that a CEPS could be 10% to 40% lighter than a TEPS. Furthermore, a CEPS could have a total efficiency gain of up to 18% compared to a similar TEPS.

scholarly journals Analysis of Electric Propulsion System for Exploration of Saturn

2009 ◽  
Vol 2009 ◽  
pp. 1-14 ◽  
Author(s):  
Carlos Renato Huaura Solórzano ◽  
Antonio Fernando Bertachini de Almeida Prado ◽  
Alexander Alexandrovich Sukhanov
Keyword(s):  
Electric Propulsion ◽  
New Technologies ◽  
Propulsion System ◽  
Keplerian Orbit ◽  
Low Thrust ◽  
Propulsion Systems ◽  
New Horizons ◽  
Outer Planets ◽  
Electric Propulsion System ◽  
Solar Electric Propulsion

Exploration of the outer planets has experienced new interest with the launch of the Cassini and the New Horizons Missions. At the present time, new technologies are under study for the better use of electric propulsion system in deep space missions. In the present paper, the method of the transporting trajectory is used to study this problem. This approximated method for the flight optimization with power-limited low thrust is based on the linearization of the motion of a spacecraft near a keplerian orbit that is close to the transfer trajectory. With the goal of maximizing the mass to be delivered in Saturn, several transfers were studied using nuclear, radioisotopic and solar electric propulsion systems.

scholarly journals Electric Propulsion system on the basis of the matrix direct frequency converter

2015 ◽  
Vol 7 (2) ◽  
Author(s):  
Evgenij Koptjaev ◽  
Roman Evseev ◽  
Vyacheslav Balashevich
Keyword(s):  
Electric Propulsion ◽  
Output Voltage ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Propulsion System ◽  
Mode Switching ◽  
Natural Mode ◽  
Propulsion Systems ◽  
Electric Propulsion System ◽  
Soft Start

Many of today's ships are equipped with electric propulsion systems, which leads to the relevance of the article. The general trend is the use of electric propulsion systems AC, due to a more robust design of an asynchronous motor and slightly better weight and dimensions. The use of asynchronous motor requires a static frequency converter for speed control and soft start. In the currently used PWM converters different types. Opportunities classical direct frequency converters are limited due to a number of fundamental shortcomings, particularly the lack of quality of the output voltage and the presence of the gap current during switching. Offered in Article electric propulsion system with direct frequency converter allows for a natural mode switching valves, as well as significantly improve the harmonic composition of output voltage and current of the inverter. The absence of a carrier frequency pulse-width modulation improves acoustics and electromagnetic compatibility with the ship's equipment. Mode powered by two independent generators improves vibro-acoustic characteristics.

A Novel Control Model for Electric Propulsion Systems in All-Electric Ships

2012 ◽  
Vol 433-440 ◽  
pp. 2541-2545
Author(s):  
Chun Lien Su ◽  
Ruei Hung Weng
Keyword(s):  
Electric Propulsion ◽  
Pulse Width Modulation ◽  
Power Conversion ◽  
Harmonic Distortion ◽  
Control Model ◽  
Propulsion System ◽  
Nonlinear Loads ◽  
Propulsion Systems ◽  
Electric Propulsion System ◽  
Proposed Model

In recent sea and undersea vehicles, implementation of all-electric ships (e-ships) technologies that employ various types of semiconductor switching devices based power conversion modules has brought revolution. These power converters that are nonlinear loads can produce non-sinusoidal distorted currents and these currents are then delivered and broadcasted through the power network and thus bus voltages are distorted. This effect can be more obvious while large loads fed and controlled through power conversion modules, such as electric propulsion system, operate for different purposes of missions. In order to improve the harmonic distortion due to operation of electric propulsion systems, a novel control model for electric propulsion motors is proposed in this paper. The electric motor drivers are controlled through three inverter triggering signals including pulse width modulation (PWM), Quasi-Six Step, and Six-Step for different ship navigation scenarios. Simulation results of application of the proposed model to a practical ship with electric propulsion system are presented. Test results have demonstrated that with the proposed model the harmonic distortions produced by electric propulsion systems under different speed situations can be effectively mitigated and consequently the system supply quality is maintained.

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