On studying the power supply quality problems due to thruster start-ups

This paper proposes a shape optimization procedure to design a three phase squirrel cage induction motor. For the purposes of the analysis, on a first step, preliminary motor design using classical analytical techniques is employed. On a second step, the parameterization of the design and extended sensitivity analysis of the stator and rotor geometrical parameters using Finite Element (FE) models is performed. Finally, the calculation of the per-phase equivalent circuit of variable parameters, incorporating the results of the FE model, enables the comparison of the results produced by the two methods. The procedure is applied to the design of an induction motor for ship thruster propulsion.

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“…For large ships and where enhanced maneuverability is required they are often fitted in pairs. [1][2], [7][8][9][10][11][12].…”

Section: R Smentioning

confidence: 99%

Design considerations in induction motors for ship thruster propulsion

Nikolaou

Beniakar

Kladas

2014

2014 International Conference on Electrical Machines (ICEM)

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“…Hence, during the thruster motor starting-up process, there is a voltage drop on the line impedance. However, it should be noted that the directon-line starting-up for thruster (above 100kW) is not recommended and the thruster is usually started via autotransformer or soft-started via power electronic devices, so that the inrush current phenomenon is fairly reduced during the starting-up [29] (also can be seen in Fig.4 (b)). Therefore, the line impedance of thruster have limited impact for the voltage dips assessment.…”

Section: B Proposed Prediction Model For the Voltage Dipsmentioning

confidence: 99%

An Evaluation Method for Voltage Dips in a Shipboard Microgrid Under Quasi-Balanced and Unbalanced Voltage Conditions

Liu

Tarasiuk

et al. 2019

IEEE Trans. Ind. Electron.

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High power motor loads are widely used in shipboard microgrids (SMGs) consuming about 70% of generated electrical power. Voltage dips, which are usually caused by the starting current of high power motors, are one of the main causes of onboard sensitive electrical equipment dropout. This phenomenon must be considered in design of SMGs to comply with maritime standards. In this paper, an evaluation method is proposed to estimate the expected severity of voltage dips and also generator current transient surges due to the onboard motor start-ups under real seagoing conditions. This is based on the Riemannsummation-principle evaluation method. The quasibalanced and unbalanced AC bus voltage cases were carefully selected to present the actual impact of the voltage dips in real SMG. The evaluations are validated by measurements gathered from the ballast pump motor start-up in the SMG. The proposed method can provide ship engineers with necessary information about the actual magnitude/depth of voltage dips. Accordingly, the allowable capacities of high power motors can be estimated, which is beneficial to determine proper motor starter designs and improve the power quality in real SMGs.

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“…As reported in [18,19] voltage fluctuation associated with thruster start-ups can be of magnitudes higher than the ± 20% of the permissible variation limits in standards, affecting the maneuvering and the safety of the ship, and even causing the failure of the whole shipboard power system. Different methods for detection and classification of these severe voltage fluctuations have been proposed in [20,21].…”

Section: Voltage and Frequency Fluctuationsmentioning

confidence: 99%

“…According to standard IEC 61000-4-7, the maximum permissible synchronization error between the sampling window and the power system frequency should not exceed ± 0.03% for harmonic measurement, and this synchronization should be possible within a range of at least ± 5% of the nominal power system frequency [2]. As is reported in [18,19], frequency variations in shipboard power networks are normally higher than the standard synchronization requirements, so standard harmonic measurements are really difficult in these non stationary conditions. To cope with this problem different proposals have been made in the technical literature.…”

Section: Harmonic Distortionmentioning

confidence: 99%

A review of measurement and analysis of electric power quality on shipboard power system networks

Barros

Diego

2016

Renewable and Sustainable Energy Reviews

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Electric power quality is an important aspect of increasing concern in power system networks in ships. A poor power quality not only affects the performance of the ship's electrical installations, but it also greatly affects the efficient use of energy, the security of navigation and the safety of life at sea. This paper presents an extensive critical literature review of the main contributions in the principal aspects of power quality in ships. Voltage and frequency fluctuations, voltage dips and swells, transients and voltage notching, fault detection and classification, harmonic distortion and voltage imbalance are reviewed and discussed. Finally, power quality instrumentation and power quality regulations for electrical installations in ships are also considered. Keywords-electric power quality in ships, ships power systems, harmonics, instrumentation,regulations.

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On studying the power supply quality problems due to thruster start-ups

Cited by 9 publications

References 1 publication

Design considerations in induction motors for ship thruster propulsion

Design considerations in induction motors for ship thruster propulsion

An Evaluation Method for Voltage Dips in a Shipboard Microgrid Under Quasi-Balanced and Unbalanced Voltage Conditions

A review of measurement and analysis of electric power quality on shipboard power system networks

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