scholarly journals Integration of Wave Power Farms into Power Systems of the Adriatic Islands: Technical Possibilities and Cross-Cutting Aspects

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 13
Author(s):  
Damir Šljivac ◽  
Irina Temiz ◽  
Branka Nakomčić-Smaragdakis ◽  
Matej Žnidarec
Keyword(s):  
Power Systems ◽  
Wave Energy ◽  
Power Flow ◽  
Social Impact ◽  
Low Voltage ◽  
Storage System ◽  
Energy Storage System ◽  
Wave Power ◽  
Direct Drive ◽  
Wave Power Potential

Wave energy is of interest for regions with high wave power potential, as well as for regions with modest wave power potential such as the Adriatic/Mediterranean coastlines and islands. In the present paper, the possibility of integrating a wave power farm with the power system of an island in the Adriatic Sea, combining the wave power with a battery energy storage system (BESS) and solar photovoltaics (PVs) is explored and its impact on the local weak low voltage grid is investigated. The load profile is typical of the demand (consumption) of an Adriatic island, in which the demand substantially increases during summer (the tourist season). The wave power technology is a point-absorbing wave energy converter (WEC) with a direct drive linear permanent-magnet synchronous generator power take-off device. Wave power farms (WPFs) consist of two to ten WECs. In this study, we show that the integration of a WPF consisting of two WECs into the grid is optimal and helps to reach zero grid exchange, and a BESS reduces the intermittency of the power flow into the grid. Since a potential wave power farm is to be installed in a populated recreational area, the technical study is complemented by discussion on cross-cutting aspects such as its environmental and social impact.

scholarly journals Design and Research of Double-Sided Linear Switched Reluctance Generator for Wave Energy Conversion

2018 ◽  
Vol 8 (9) ◽  
pp. 1700 ◽  
Author(s):  
Yan Chen ◽  
Min Cao ◽  
Chunyan Ma ◽  
Zhigang Feng
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Wave Energy ◽  
Structure Design ◽  
Wave Power ◽  
Direct Drive ◽  
Pull Force ◽  
Switched Reluctance ◽  
Continuous Power ◽  
Wave Power Generation

As a clean and renewable energy source, wave energy is of great significance in solving primary energy shortages and environmental pollution. Direct-drive wave power systems consisting of linear generators have attracted the attention of researchers from various countries. Linear Switched Reluctance Generator has the advantages of simple structure, sturdiness, reliable operation, suitable for harsh environments, and easy maintenance, aiming at the problem of single-sided magnetic pull force and serious coupling of phase winding of traditional linear switched reluctance generator, a Double-sided Linear Switched Reluctance Generator (DLSRG) for wave power generation is designed, and its electromagnetic characteristics (including coupling characteristics, magnetic saturation characteristics, and magnetic tension characteristics) are analyzed to verify the rationality of the structure and parameter selection. Finally, the power generation performance is studied. The joint simulation results show that the structure design of DLSRG is reasonable, overcomes the problem of single-sided magnetic pull force, the phase-to-phase coupling is negligible, and it has continuous power generation capability, and the power generation efficiency is as high as 80.6%. Therefore, DLSRG designed in this paper is suitable for wave power generation.

Design and Simulation of a New ZVT Bi-directional DC-DC Converter for Electric Vehicles

2017 ◽  
Vol 7 (1) ◽  
pp. 75
Author(s):  
Rajesh Thumma ◽  
Veera Venkata Subrahmanya Kumar Bhajana ◽  
Pramo kumar Aylapogu
Keyword(s):  
Electric Vehicles ◽  
Power Flow ◽  
Low Voltage ◽  
Storage System ◽  
Energy Storage System ◽  
Switching Losses ◽  
Auxiliary Cell ◽  
Bidirectional Converter ◽  
Simulation Results ◽  
Zero Voltage

<p>This paper presents a new zero voltage transistion (ZVT) bi-directional DC-DCconverter for energy storage system in DC traction. This bidirectional converter can transfers the power flow from low voltage side to high voltage side and viceversa. The conventional hard-switched non-isolated converter improved with the additional auxiliary cell to obtain zero voltage transition for the IGBTs. The main advantages of this topology are reduced the switching losses and improved the efficiency as well.The main aim of this converter is to achieve the operation of zero voltage transition during the commutation of main switches from off to on by utilizing auxiliary cell, which consist active and passive elements.The boost and buck modes of operations are achieved with the zero voltage transistion, which reduce the IGBTs current stresses and switching losses.This paper mainly describes the operation principles and the evaluation of the simulation results with the aid of Matlab simulations.The obtained results were proved the expected assumptions of the theoretical analysis.</p>

scholarly journals Demonstration of a microgrid manager in a distribution grid with high PV penetration and Storage: La Graciosa case study

2018 ◽  
Vol 61 ◽  
pp. 00012
Author(s):  
Guillermo Domínguez-López ◽  
Pol Paradell-Solà ◽  
José Luis Domínguez-García ◽  
Jacob Rodríguez-Rivero ◽  
Jorge Sánchez-Cifuentes
Keyword(s):  
Power Systems ◽  
Distribution System ◽  
New Technologies ◽  
Low Voltage ◽  
Storage System ◽  
Distribution Networks ◽  
Energy Storage System ◽  
Monitoring And Control ◽  
Distribution Grid ◽  
Grid Operation

Future power systems with high penetration of distributed energy resources (DER) and information and communication technology (ICT) will allow increasing the controllability and observability of the grid. However, new challenges for low voltage distribution networks has arisen where the increasing DER is mainly photovoltaic (PV) installed on the roofs of buildings. This type of generation is variable and generates disturbances in the network. Islands are ideal to experience and install new technologies since are weak grids and the penetration of PV will lead to bidirectional power flows at distribution level, thus a smart control will be required. This article aims to present and innovative tool for the distribution system operators (DSOs) to monitor and manage grid operation. In near future, both DER and client’s flexibility will increase. New monitoring and control tools for DSOs are essential. Furthermore, the grid operation optimization is needed to accommodate the expected DER installations and the active participation of consumers’ flexibility services in markets ensuring system efficiency. This tool is tested on “La Graciosa” grid, one of the Canary Islands, to show its benefit. The grid studied includes a hybrid energy storage system (HESS), PV generators, controllable/uncontrollable loads and equipment to monitor power flows.

scholarly journals Wave Power Output Smoothing through the Use of a High-Speed Kinetic Buffer

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2196 ◽  
Author(s):  
Brenda Rojas-Delgado ◽  
Monica Alonso ◽  
Hortensia Amaris ◽  
Juan de Santiago
Keyword(s):  
Energy Storage ◽  
Wave Energy ◽  
Power Output ◽  
Storage System ◽  
Reference Signal ◽  
Energy Storage System ◽  
Wave Power ◽  
Flywheel Energy Storage ◽  
Hybrid Wave ◽  
Flywheel Energy Storage System

In this paper, a new control strategy for power output smoothing in a hybrid wave energy installation coupled to a flywheel energy storage system (FESS) is proposed. The control scheme is composed by three stages: a wave generator clustering process at the farm connection point; a power filtering process; and the control of the flywheel energy storage in order to improve the power output of the hybrid wave farm. The proposed control is validated at the existing Lysekil Wave Energy Site located in Sweden, by using real generator measurements. Results show that the application of the flywheel energy storage system reduces the maximum peak power output from the wave energy installation by 85% and the peak/average power ratio by 76%. It is shown that the proposed system can reduce grid losses by 51%, consequently improving the energy efficiency of the power network. The application of the proposed control strategy allows the hybrid wave power plant to follow a power reference signal that is imposed by the grid operator. In addition, the study demonstrates that the application of the proposed control allows the hybrid wave power plant to follow a power reference signal that is imposed by the grid operator. In addition, the study demonstrates that the application of the proposed control enables a wave farm with flywheel energy storage to be a controllable, flexible resource in order to fulfill future grid code requirements for marine energy installations.

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