The Study of Chaotic Behaviour in the Marine Power System Containing Nonlinear Varying Load

Jankowski, Piotr; Piłat, Andrzej; Tarasiuk, Tomasz

doi:10.1109/icepe.2018.8559897

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…Two generators are connected to each switchboard: one with 1500 kW of power and one with 2000 kW. Each electrical switchboard can supply up to 3,500 kW of power [76][77][78][79][80]. The thrusters are connected to the switchboard by means of circuit breakers, a three-phase transformer and a 12-pulse converter [81][82][83][84][85][86].…”

Section: Conventional Dynamic Positioning Systemmentioning

confidence: 99%

A Comparative Analysis of Energy Consumption by Conventional and Anchor Based Dynamic Positioning of Ship

Łebkowski

Wnorowski

2021

Energies

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One of the requirements for ships equipped with dynamic positioning system is the ability to maintain a given position in various hydrometeorological conditions. At the same time, efforts at reducing electricity consumption are made in order to reduce operating costs and emissions of exhaust gases, such as sulfur oxides and greenhouse gases such as carbon dioxide (CO2). For this purpose, the ship designer at the design stage must predict both how much energy the ship will theoretically use during operation and how the expenditure can be reduced. The publication presents a comparison of energy consumption with two different approaches to ship positioning: the use of classic dynamic positioning utilizing a set of thrusters and by using a set of anchors. In order to determine the energy consumption during positioning, the matrix method was used, on the basis of which the analysis of the ability to hold the position of the ship (capability plot) was performed, in accordance with the recommendations of the classification society DNV GL. Thanks to this analysis, it was possible to find such a distribution of thrust vectors on propulsors that the ship would not lose its set position under the hydrometeorological conditions specified in the analysis. As a result of comparing the two positioning systems, it turned out that using anchor-based positioning uses 24% less energy than positioning based on a set of thrusters, which translates into 24% less CO2 emissions into the atmosphere.

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Section: Conventional Dynamic Positioning Systemmentioning

confidence: 99%

A Comparative Analysis of Energy Consumption by Conventional and Anchor Based Dynamic Positioning of Ship

Łebkowski

Wnorowski

2021

Energies

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“…Next, the Poincare map has also been determined using the same scaling factors. Poincare map is defined as a stroboscopic image determined on the basis of the phase trajectory with a constant period T (Kantz and Schreiber, 2004;Schuster and Just, 2005;Jankowski et al, 2018). However, in the case of maritime microgrids, the power frequency fluctuates.…”

Section: Phase Portraits and Poincare Mapsmentioning

confidence: 99%

“…This means that, after a few cycles, the Poincare map determined for constant time span would mimic phase portrait. Therefore, the authors determined the Poincare map for constant phase of the fundamental component (Jankowski et al, 2018). The research consisted of determining the Poincare maps for twenty four phases (15°step) of each voltage value considered.…”

Section: Phase Portraits and Poincare Mapsmentioning

confidence: 99%

Comparative Case Study on Oscillatory Behavior in Power Systems of Marine Vessels With High Power Converters

Tarasiuk¹,

Jankowski²,

Shagar³

et al. 2021

Front. Energy Res.

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The chief aim of the proposed paper is to compare the behavior of supply voltage registered onboard three vessels equipped with high power converters during normal operation. The vessels considered are a chemical tanker with shaft generator working via power converter, a research-training ship with bow thruster, and a research vessel with dynamic positioning (DP) and electrical propulsion. In the case of the two latter ships, power electronic loads are present, which include a bow thruster adjustable speed drive equipped with the six pulse uncontrolled rectifier and the adjustable speed drive with an active front end (AFE) for propulsion system. For each ship, instantaneous frequency is determined and subsequently fluctuations of fundamental components and chosen harmonics are calculated using zoom-DFT. The characteristics of these irregular fluctuations are compared and commented on. Next, phase portraits and Poincare map of the registered voltages are calculated and compared. Moreover, the impact of ship rolling and pitching on the oscillatory behavior is assessed for the DP ship. The final conclusions identify reasons for oscillatory behavior in electric power systems of marine vessels containing high power converters on the source side and load side. The feasibility of using voltage trajectories as well as Poincare maps for oscillatory behavior detection is assessed.

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The Study of Chaotic Behaviour in the Marine Power System Containing Nonlinear Varying Load

Cited by 2 publications

References 16 publications

A Comparative Analysis of Energy Consumption by Conventional and Anchor Based Dynamic Positioning of Ship

A Comparative Analysis of Energy Consumption by Conventional and Anchor Based Dynamic Positioning of Ship

Comparative Case Study on Oscillatory Behavior in Power Systems of Marine Vessels With High Power Converters

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