NDLI: Design of GEMSTAR tidal current fixed pitch rotor controlled through a Permanent Magnet Generator (PMG) de-fluxing technique

Content Provider	IET Digital Library
Author	Coiro, Domenico P. Troise, Giancarlo Bizzarrini, Nadia Lazzerini, Guido Noia, Luigi Pio Di Iannuzzi, Diego Coppola, Marino
Abstract	This work reports a study on a tidal current system named GEMSTAR, composed of two hydrokinetic turbines supported by a floating submerged structure. A flexible mooring cable links the floating support to the seabed allowing the free rotation of the system and its alignment to changing current direction. The work is mainly focused on the design of the turbine blade with two objectives: keeping a constant power output above the rated power condition and limiting the thrust increase between rated and maximum operating speed. A fixed pitch blade was considered, in order to reduce the costs associated to a complex pitch control mechanism. An analytical procedure for blade design is proposed and validated by comparison to other numerical methods. Above the rated current speed, the power is held constant while the rotational speed of the turbine and of the generator increases, assuming an over-speeding control strategy. The adopted design configuration relies on the possibility of the generator to operate in de-fluxing working conditions. As reported in the last part of this study, a numerical model of the generator has also been developed and applied to a test case in order to analyse the electric behaviour of the system.
Starting Page	2897
Ending Page	2907
Page Count	11
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 15, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2020.0434
Journal	IET Renewable Power Generation
Publisher Date	2020-10-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acceleration Aerodynamics Angular Velocity Control Blade Design Blades Constant Power Output Control of Electric Power System Control of Hydraulic System Design Engineering Fixed Pitch Blade Flexible Mooring Cable Floating Submerged Structure Floating Support Fluid Mechanics GEMSTAR Tidal Current Fixed Pitch Rotor Generator Hydraulic Turbines Hydroelectric Generator Hydrokinetic Turbines Mechanical Component Mechanical Engineering Over-speeding Control Pitch Control Pitch Control (position) PMG De-fluxing Technique Power And Plant Engineering Power Generation Control Rated Current Speed Rotation Control Rotational Speed Rotors Spatial Variables Control Tidal Current System Tidal Power Stations Tidal Power Stations And Plant Turbine Blade Velocity
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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