Sizing of Electrical Generators for a Floating Oscillating Water Column Array PO.ID 335 Ozan Keysan, Markus Mueller Institute for Energy Systems – University of Edinburgh [email protected] Generator Sizing MARINA Platform Combined Wind and Wave Energy Platforms[1] Spar Wind Turbine – Torus Type Heaving Buoy Semi-submersible Platform Semi-submersible Platform with with Flap Type WECs Three Submerged Flap Type WECs Simulink Model of the Oscillating Water Column Generator Annual Normalized Rating Energy 200 kW 574 MWh 85.7% Floating Platform with Oscillating Column Array Specifications of the OWC Array [2] Wind Turbine Rating 5 MW Wind Turbine PTO Gearbox + DFIG Number of OWC OWC Rating 20 500 kW (Each) OWC PTO Direct Drive SCIG Selected Sites Wave and Wind Energy Characteristics 250 kW 603 MWh 90.0 % 300 kW 624 MWh 93.1 % 400 kW 652 MWh 97.3 % 500 kW 670 MWh 100 % Smaller Generator: • Higher capacity factor • Reduced generator cost • Reduced subcomponent (cable, electronics) cost • Higher efficiency A 500 kW generator produces 670 MWh/year. Reducing the generator rating to 250 kW reduces the energy harvest just by 10 %. In other words for the extra 70 MWh, the generator capacity has to be doubled, which makes the extra 70 MWh nine times more expensive than the first 600 MWh. It is also possible to get more power from the generator due to improved cooling in the OWC chamber as shown in [8]. In this case, the size of the generator can be further reduced. Generator Parameter Estimation In Simulink, electrical generators are modelled using a mechanical and an electrical system. Mechanical system is defined by rotor inertia and friction constant. The electrical system is represented using the equivalent electric circuit parameters: Rs, Rr stator and rotor resistance, Lls, Llr stator and rotor leakage inductance, Lm magnetising. Site #3 : Buoy Cabo Silleiro (off the coast of Portugal-Spain)[3] Average Wind Speed 6.98 m/s Average Wave Power 42.7 kW/m Average Wave Period Significant Wave (50 years) 11.84 s 10.2 m References: [1] M. Barrios, I. Martinez, J. Murphy, K. Lynch, and C. Pavon Lopez, “Methodology for assessing multiple combined wind and ocean energy technologies as part of the EU FP7 MARINA Platform Project.,” in International Conference on Ocean Energy, 2012. [2] K. O. Sullivan and J. Murphy, “Techno-Economic Optimisation of an Oscillating Water Column Array Wave Energy Converter,” in European Wave and Tidal Energy Conference (EWTEC2013), no. Stage 1, pp. 1–8, 2013. [3] Z. Gao, “MARINA WP3-4 Meeting, Environmental Data from WP2 at the 18 Selected Sites Data,” tech. rep., 2012. Rotor Inertia Time Constant Magnetising Inductance Leakage Inductance Stator Resistance Stator Resistance (logarithmic) You can download this poster and the datasets used in the paper by scanning the QR-code, or with the link: http://github.com/ozank/ewea-2014-paper EWEA 2014, Barcelona, Spain: Europe’s Premier Wind Energy Event “This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grant agreement No FP7-241402.
© Copyright 2024 ExpyDoc
