On resolving reactive power problems in ship electrical energy systems

Prousalidis, John; Antonopoulos, G.; Mouzakis, Panagiotis; Sofras, E.

doi:10.1080/20464177.2015.1118786

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…A similar situation occurs in ship power systems. In these systems, motors working with various load factors can be expected, including significantly oversized machines [25], [26].…”

Section: B Load Parametersmentioning

confidence: 99%

Coefficient of Voltage Energy Efficiency

et al. 2020

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The reduction of greenhouse gas emissions is a major contemporary challenge. This has prompted the requirements concerning energy efficiency for ships, among other things. Improvement in efficiency of ship operations could be achieved by reducing unnecessary power consumption by induction motors. Specifically, the occurrence of power quality disturbances, such as frequency and voltage deviations, voltage unbalances, and voltage harmonics, can cause an extraordinary increase in the power losses occurring in induction motors, as well as an unnecessary increase in the output power. Furthermore, excessive power quality disturbances are often interconnected with failures of on-board equipment, and in extreme cases, these may even pose a threat to safety at sea. Consequently, strict power quality monitoring of on-board microgrids can also contribute to improving safety while afloat. In this study, a dedicated tool for power quality monitoring is proposed, namely the coefficient of voltage energy efficiency, which has a value proportional to the power losses occurring in induction motors under power quality disturbances. INDEX TERMS Energy efficiency, induction motors, marine technology, power systems, power quality.

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“…A similar situation occurs in ship power systems. In these systems, motors working with various load factors can be expected, including significantly oversized machines [25], [26].…”

Section: B Load Parametersmentioning

confidence: 99%

Coefficient of Voltage Energy Efficiency

et al. 2020

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“…Consequently, the overall efficiency of the system is reduced because of this decrease in the input power factor, as well as the severely distorted waveforms, owing to the DC output in a pulse form [41]. To resolve these problems, a high-capacity passive filter and phase shifting transformer must be installed, which, in turn, have their own drawbacks in that they considerably increase the overall system size and installation costs associated with the system [9].…”

Section: Dfe Rectification Methods In Large-scale Electric Propulsion Systemsmentioning

confidence: 99%

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

Jeon

Kim

Yoon³

2019

JMSE

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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.

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“…The static var compensator (SVC) is a more sophisticated device that uses power electronic switches for faster action. It combines precise control of reactive power of the SVC with the simplicity of capacitor banks but with a higher cost for the owner [33]. Static synchronous compensators (STATCOMs) are another alternative for PFCs in ships.…”

Section: Sources Of Power Quality Problems In Ship Microgridsmentioning

confidence: 99%

Review of Power Quality Issues in Maritime Microgrids

et al. 2021

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This paper discusses contemporary problems concerning ship microgrids. It focuses on the role of power electronics and power quality issues, both conventional, such as voltage and frequency variations, and new issues, such as waveform distortions ensuing from the wide proliferation of power electronics in ship microgrids. The paper also contains a discussion on the provisions of the Unified Requirements of International Association of Classification Societies and other leading power quality standards in the industry, with an emphasis on Total Harmonic Distortion (THD) definition. An overview of power converters for high power applications in ships and their impact on ship networks is also given. Next, original results of various power quality phenomena recorded in ship microgrids are presented and commented on, followed by a review and recommendations for maritime microgrid modeling and signal processing methods for power quality assessment in the discussed systems. Finally, preliminary proposals for power quality control are presented.

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On resolving reactive power problems in ship electrical energy systems

Cited by 6 publications

References 3 publications

Coefficient of Voltage Energy Efficiency

Coefficient of Voltage Energy Efficiency

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

Review of Power Quality Issues in Maritime Microgrids

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