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Su C.-L.,National Kaohsiung Marine University | Lin K.-L.,National Kaohsiung Marine University | Chen C.-J.,CSBC Corporation
IEEE Transactions on Industry Applications | Year: 2016

The medium-voltage dc (MVDC) distribution system is a new shipboard power distribution technology that has been extensively discussed and studied by many shipbuilding corporations and ship-owners in recent years. As different types of power converters and ac and dc power distributions simultaneously involved in the system, the system performance for different connections of generators to MVDC converters under varying steady-state operating conditions is essential and important in the design stage of the electrical power distribution system. This type of problem can be analyzed by performing power flow studies. This paper aims presenting a methodology for power flow studies in ship MVDC distribution systems for system planning purpose. A power flow model of the power converters in steady-state is derived to consider medium and low voltage characteristics of electric power system on this type of ship. An ac/dc power flow solution approach then is developed to incorporate ac-system and dc-system models and the ac/dc interface buses in the analysis for determining an appropriate connection of generators and MVDC converters and power converter setting values. Test results of two alternatives for the direct connection of generators to MVDC converters under varying steady-state operating conditions are presented and compared to determine the proper generator-power converter scheme. © 1972-2012 IEEE.


Su C.-L.,National Kaohsiung Marine University | Weng X.-T.,National Kaohsiung Marine University | Chen C.-J.,CSBC Corporation
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

Applications of fuel cells (FCs) to ship power systems have been investigated due to their characteristics of low emission, high efficiency, low vibration, and low noise. Dynamic response is a problem when FCs are installed in ships as power sources. To make the system secure and stable, a methodology for power generation controls of FCs/energy storage hybrid ship power systems is proposed in this paper. The mathematical model of active and reactive powers regulation of the hybrid power system is derived. The model is then applied and integrated into dynamic models of proton exchange membrane fuel cells (PEMFCs) to enhance the system dynamic response. A modified practical ship power system under different operating conditions is selected for computer simulations to ensure and demonstrate the performance of proposed method. © 2014 IEEE.


Su C.-L.,National Kaohsiung Marine University | Lin K.-L.,National Kaohsiung Marine University | Chen C.-J.,CSBC Corporation
Conference Record - Industrial and Commercial Power Systems Technical Conference | Year: 2014

The medium voltage DC (MVDC) distribution system is a new shipboard power distribution technology that has been extensively discussed and studied by many shipbuilding corporations and ship-owners in recent years. As different types of power converters and AC and DC power distributions simultaneously involved in the system, the system performance for different connections of generators to MVDC converters under varying steady-state operating conditions is essential and important in early the design stage of the electrical power distribution system. This type of problem can be analyzed by performing power flow studies. This paper aims presenting a methodology for power flow studies in ship MVDC distribution systems for system planning purpose. A power flow model of the power converters in steady-state is derived to consider medium and low voltage characteristics of electric power system on this type of ship. An AC/DC power flow solution approach then is developed to incorporate AC-system and DC-system models and the AC/DC interface buses in the analysis for determining an appropriate connection of generators and MVDC converters and power converter setting values. Test results of two alternatives for the direct connection of generators to MVDC converters under varying steady-state operating conditions are presented and compared to ensure the performance of the proposed method. © 2014 IEEE.


Su C.-L.,National Kaohsiung Marine University | Lan C.-K.,Jih Yu Fishery Company | Chou T.-C.,National Kaohsiung Marine University | Chen C.-J.,CSBC Corporation
IEEE Transactions on Industry Applications | Year: 2015

A multiagent-based feeder automation system is developed for the service restoration of power systems in a navy ship after fault contingencies. In the system, power-electronic-building-block agents of the multiagent system (MAS) are used to derive the proper restoration plan after the faulted location is identified and isolated. To assure that the restoration plan complies with operation regulation, heuristic rules based on standard operation procedures of the shipboard power system (SPS) are included in the best first search of the MAS. Two control schemes for SPS restoration are investigated, and their performances are evaluated and compared using a discrete event simulation technique with respect to restoration time. For fault contingency when the capacity reserves of supporting feeders are not enough to cover the fault restoration, the load shedding strategy is derived for the MAS to restore service power to as many key loads as possible. A navy SPS with 72 feeders is selected for computer simulation to demonstrate the effectiveness of the proposed methodology. The study concludes that, to cover feeder automation functions, a MAS with distributed processing capability provides better reliability performance than the centralized control. © 2015 IEEE.


Lee S.-K.,Abs Consulting | Yu K.,Abs Consulting | Tseng R.K.-C.,CSBC Corporation
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

Slamming phenomenon commonly occurs when a ship navigates in rough seas. Depending on the relative velocities between the ship and the free surface and depending on the size of the slamming area, the slamming impact load can be significant, both locally and globally, and becomes a dominant factor in hull scantling determination. In addition to the hull slamming load, the now popular adoption of energy-saving devices (ESDs) in the stern area means the hydrodynamic load associated with the stern slamming situation on ESD also becomes an issue in design. In energy-saving propulsion configurations, the structural integrity of ESD is important because a damaged ESD can result in increased propulsive energy-loss. An accurate estimate of hydrodynamic loads in slamming situations is still a challenging topic as it involves many complex physical phenomena simulations such as large amplitude ship motion, non-linear breaking wave and transient impact load. In this study, an overset grid Computation Fluid Dynamics (CFD) methodology with level set function formulation for violent free surface simulation is adopted to study the hydrodynamic loads due to bow and stern slamming for a containership fitted with energy-saving rudder fins. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Lin T.Y.,CR Classification Society | Chen Y.K.,CSBC Corporation | Kouh J.S.,Zhejiang University
Journal of Taiwan Society of Naval Architects and Marine Engineers | Year: 2016

The propulsive efficiency of containerships usually is related to the tangential momentum loss in the wake zone behind the propeller. An asymmetric stern is an example to elevate the efficiency practically by pre-rotating the flow field in front of the propeller. In the presented study, a parametric transformation model applied to stern lines was constructed. The transformation includes three parameters: twisting strength, longitudinal distribution and radial distribution, to transform an arbitrary symmetric hull form into an asymmetric one while keeping the surface smoothness. The tested model in this study was the containership published by KRISO along with its propeller. The CFD tool STAR-CCM+ was used to simulate the resistance and propulsion tests, and then compare the result with the experimental data for validation. In addition to the nominal wake fraction, which solely accounts for the axial velocity, the tangential velocity distribution was evaluated. To discuss the relation between the transformation parameters and the axial/tangential velocity distribution in the wake zone, we studied 25 versions of asymmetric sterns and found the best parameter combination that achieved the optimal tangential velocity distribution. For the propulsion simulations, the delivered horse power can be reduced by 0.8% at the same propeller load.


Li J.-Y.,CSBC Corporation | Lee S.-K.,Shared Medical Technology, Inc.
11th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2010 | Year: 2010

As ships increase in size, their propellers also become larger and heavier. The weight increase that the larger propeller requires is the result of the greater amount of material used, causing not only an increase in the cost of material but, more significantly, a decrease in the efficiency of the propeller. In this paper, a real case of a large containership is investigated to see how to improve propeller efficiency and reduce its weight as a means to control fuel consumption and air emissions. The improved design was sought through a comprehensive study of the impacts of reducing the blade area ratio, enlarging the propeller diameter, reducing the degree of skew and adopting different skew distribution. Propeller open water tests, cavitation observation tests and pressure pulse measurements are also conducted in order to verify the final improved design with the improved fuel consumption saving and the acceptable propellerinduced force level. © 2010 COPPE/UFRJ.


Patent
CSBC Corporation | Date: 2013-09-25

A marine vehicle (200) includes a hull (210), a propeller (201), anda thrust boosting device (2) mounted to the hull (210) and disposed forwardly of the propeller (201). The thrust boosting device (2) includes first, second and third fin members (21, 22, 23) extending radially with respect to a rotational axis (L) of the propeller (201). The first, second and third fin members (21, 22, 23) form first, second and third angles (1, 2, 3) with a reference line (S) that extends upwardly from and that is perpendicular to the rotational axis (L), respectively. The first angle (1) ranges between 70 and 110, the second angle (2) ranges between 225 and 255, and the third angle (3) ranges between 285 and 315.


Patent
CSBC Corporation | Date: 2011-10-19

A container vessel includes a hull (2) defining a container-retaining space (22) therein and having a top area (21), and a pair of carrier structures (31). The carrier structures (31) are disposed respectively on two lateral surfaces (24) of the hull (2). Each of the carrier structures (31) passes through a waterline of the hull (2) and has a top surface (315). The top surfaces (315) of the carrier structures (31) and the top area (21) of the hull (2) cooperate with each other to form a supplementary container-storing region (4).


Tseng R.K.C.,CSBC Corporation
Marine Technology | Year: 2011

The twin-island design has emerged as the new trend in designing new container vessels for the expanded Panama Channel. The new design concept involves the engine room being retained at the conventional location with the funnel, while some duty rooms are reserved. This concept also allows fuel oil tanks to be located underneath the forward deckhouse and are fully protected. Experts have also found that widening of a vessel's beam from 32.31 meters to 49 meters will not cause any problem for the stability concerns of the new container vessels. The minimum ballast tanks for ship operation need to be considered to sustain GM limit due to SOLAS damage stability and other issues to increase time efficiency and to control construction and operational costs.

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