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289 results on '"Tedeschi, Elisabetta"'

82. Comparative Evaluation of AC and DC Power Distribution Systems for Underwater Vehicles Based on Multiobjective Optimization Techniques.

Author

Le, Hoai Nam and Tedeschi, Elisabetta

Subjects
*SUBMERSIBLES, *MATHEMATICAL optimization, *SUBMARINE cables, *FINITE element method
Abstract

This paper presents a multiobjective optimization technique for the submarine cables of high-power remotely operated vehicles (ROVs). A detailed design flowchart with integrated electrical and mechanical designs of the ROV submarine cables is provided to quantitatively compare AC and DC-based power distribution systems and identify the optimal design from multiple standpoints, prioritizing electrical loss and cable weight. The electromechanical cable design optimization plays a vital role in the ROV industry and in all those applications where the power distribution system is employed vertically from the support platform/vessel. The entire procedure is exemplified by carrying out a particular case study; for an ROV power hub with rated power of 5 MW and operational depth of 6000 m, the DC submarine cable design with distribution voltage of 33 kV results in an electrical loss reduction of 54.3% compared to the AC submarine cable design with distribution voltage of 22 kV at similar cable weights of 63 ton. Additionally, the proposed method can be widely applied to any type of AC-DC comparison to achieve the optimal ROV submarine cable design with a considerably short process time in comparison to the approaches with finite element analysis. [ABSTRACT FROM AUTHOR]

Published
2021
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83. Unbalanced Load Compensation by PowerBased Control in the Synchronous Reference Frame

Author

Göthner, Fredrik T. B. W., Brandao, Danilo, and Tedeschi, Elisabetta

Abstract

Power-based control has proven to be an effective and robust way for having a centralized control scheme in a microgrid. The scheme has a minimal communication requirement, which enables the distributed energy resources (DERs) in the system to share the load proportionally according to their capability. This paper proposes a modification of the conventional power-based control, which is applicable to the synchronous reference frame. The proposed scheme enables unbalanced load compensation, while reducing the necessary communication between the master controller and the local inverter controllers. Finally, the scheme also proposes weighting factors for reducing the voltage unbalance factor of the grid. The proposed scheme is valid for three-phase three-wire systems. The effectiveness of the scheme is shown through numerical simulations. © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Published
2019

95. Power oscillation damping with virtual capacitance support from modular multilevel converters.

Author

Taffese, Abel A., Endegnanew, Atsede G., D'Arco, Salvatore, and Tedeschi, Elisabetta

Abstract

Power oscillation damping (POD) is one of the ancillary services expected from high‐voltage direct current (HVDC) converters. When providing POD to the ac side, converters draw power from the dc side, which can cause distortion to the dc voltage especially in the case of limited dc capacitance. In meshed/multi‐terminal HVDC grids, where dc voltage regulation is distributed using a dc voltage droop control strategy, the distortion due to the POD controller action is propagated to other connected ac grids because of the droop action. This propagation can be reduced by using the inherent energy storage capability of the modular multilevel converter (MMC), which is a common converter topology for HVDC. Different methods to utilise the energy stored in the MMC for the purpose of POD have been proposed in the literature. This study presents a detailed analysis and experimental validation of one of these methods, referred to as virtual capacitance support, which increases the effective dc grid capacitance by using the stored energy of multiple MMCs connected in the same grid. The experiments, which were carried out using power hardware in the loop setup, demonstrated the effectiveness of the method. [ABSTRACT FROM AUTHOR]

Published
2020
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