First Power Production Results from the Wave Star Roshage Wave Energy Converter
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1 First Power Production Results from the Wave Star Roshage Wave Energy Converter Laurent Marquis, Head of Development, Wave Star A/S Morten Kramer, R&D engineer, Wave Star A/S Peter Frigaard, Head of Civil Engineering Department, Aalborg University 3 rd International Conference on Ocean Energy, 6 October, Bilbao
2 The Wave Star machines Test machine at Aalborg University Deployment: Scale: 1/40 Float diameter: 0.25 m Test machine at Nissum Bredning Deployment: Scale: 1/10 Float diameter: 1.0 m Test section at Roshage Deployment: 2009-> Scale: 1/2 Float diameter: 5.0 m 2
3 Wave Star make use of a unique concept 2 rows with10 floats, 20 floats total The floats are mounted on a machine which is founded on the seabed All the moving gparts are located above the waterline Hydraulic fluid is pumped from each float to a hydraulic motor, which drives a generator The Wave Star machine can lift the floats out of the water into safety position 3
4 Wave Star scale 1:40 Aalborg University, Denmark 4
5 Normal operation Storm protection mode Wave Star scale 1:10 Nissum Bredning, Denmark 5 More than 4 years in operation and 15 storms without damage
6 The location for the test section (photo taken before deployment) Roshage Pier, location for the Wave Star scale 1:2 test section Hanstholm, Denmark 6 Energy Supply Chain June 2009
7 7 The machine was built in Gdansk and towed to Denmark in August 2009
8 8 The jacking system was tested in dry dock in Frederikshavn, Denmark
9 The machine was installed on 18 September 2009 Video: Installation 9
10 The 19 th of September 2009 the installation was finalized and the machine was placed in storm protection Video: Storm protection 10
11 A bridge was built during the autumn 2009, and the first guests visited the plant during COP15. The machine has been supplying electricity to the grid since February Video: Operation 11
12 The Roshage test unit is a section of the complete machine Parameter Roshage test unit Commercial Wave Star C5-600 kw Number of floats 2 20 Float diameter Ø5 m Ø5 m Arm length 10 m 10 m Weight 1000 Tons 1600 Tons Nominal electrical power 110 kw 600 kw 12
13 Power measurements from the Roshage test unit Measured September 2010 (Control generation 3) Measured June 2010 (Control generation 2) Measured May 2010 (Control generation 1) Simulation, Control generation Power (kw) Power (kw) Significant wave height (m) Wave power (kw/m) 13 Notes: Power is 10 minute average values of harvested power from one float (hydraulic power leaving one cylinder) The same data are shown in the figures, only the x-axis is different A typical wave period for the Roshage location is used for the simulated curve
14 Power measurements from the Roshage test unit Measured September 2010 (Control generation 3) Measured June 2010 (Control generation 2) Measured May 2010 (Control generation 1) Simulation, Control generation 3 ForskVE Limit Curve Power (kw) Power (kw) Significant wave height (m) Wave power (kw/m) 14 Notes: Power is 10 minute average values of harvested power from one float (hydraulic power leaving one cylinder) The same data are shown in the figures, only the x-axis is different A typical wave period for the Roshage location is used for the simulated curve
15 Approved by EnergiNet is a non-profit enterprise owned by the Danish Climate and Energy Ministry If the measured production is above the limit, subsidies are recieved from EnergiNet Measured production Limit for subsidies Example of measured data from the Roshage test unit (10 min average values): PLC_Datetime AllDataValid Hs Tmean P_TwoFloats ForskVE_limit AboveLimit [%] [m] [s] [kw] [kw] [True/False] 21/09/10 09: True 21/09/10 09: True 21/09/10 09: True 21/09/10 09: True 21/09/10 10: True 21/09/10 10: True 21/09/10 10: True 21/09/10 10: True 21/09/10 10: True 21/09/10 10: True 21/09/10 11: True 21/09/10 11: True 21/09/10 11: True 21/09/10 11: True 21/09/10 11: True 21/09/10 11: True / / 15 Power numbers in kw are measured harvested power (hydraulic power leaving the two cylinders). Wave climate is calculated using wave measurements at the location.
![[kw] [True/False] 21/09/10 09:20 100 2.08 4.72 48.98 34.24 True 21/09/10 09:30 100 1.91 4.31 37.50 28.71 True 21/09/10 09:40 100 1.94 4.10 38.02 29.80 True 21/09/10 09:50 100 2.01 3.95 33.69 32.](/docs-images/44/21131948/images/page_15.jpg "07 True 21/09/10 10:00 100 203 2.03 447 4.47 39.9191 32.85 True 21/09/10 10:10 100 2.17 4.23 42.91 37.42 True 21/09/10 10:20 100 2.01 4.39 38.94 32.04 True 21/09/10 10:30 100 2.01 4.14 39.84 32.")
16 Power measurements from the Roshage test unit Measured September 2010 (Control generation 3) Measured June 2010 (Control generation 2) Measured May 2010 (Control generation 1) Simulation, Control generation 3 Capture width (m) Capture wid dth ratio (%) Wave power (kw/m) Wave power (kw/m) 16 Notes: Power is 10 minute average values of harvested power from one float (hydraulic power leaving one cylinder) The same data are shown in the figures, only the y-axis is different A typical wave period for the Roshage location is used for the simulated curve
17 Power matrix for a single Wave Star C5 600 kw machine with 20 floats Values inside the table are average electrical power to grid in kw. Wave height Wave period T 0,2 (s) H m0 (m) Storm protection 17
18 Perspectives: Wave Star C5 performance at different sites in Europe Site Nominal Power Storm protection Annual production Belmullet, IR 1200 kw Hs > 5 m 4.29 GWh Site Nominal Power Storm protection Annual production EMEC,UK 1200 kw Hs > 5 m 2.88 GWh Site Nominal Power Storm protection Annual production Wave Hub, UK 1200 kw Hs > 5 m 2.64 GWh Site Nominal Power Storm protection Annual production Site Nominal Power Storm protection Annual production Horns Rev 2,DK 600 kw Hs > 3 m 1.41 GWh SEM-REV, F 1200 kw Hs > 5 m 2.37 GWh Site Nominal Power Storm protection Annual production Pilot Zone, P 1200 kw Hs > 5 m 2.87 GWh Site Nominal Power Storm protection Annual production BIMEP, ES 1200 kw Hs > 5 m 2.21 GWh 18
19 C5 Wave Star and C10 Wave Star C5 70 m long 20 floats of Ø 5 m ~ m of water depth m Hs C m long 20 floats of Ø10 m ~ m of water depth 6 5.0m Hs Double size = 11 times more power 19
20 Road Map for Cost of Energy for Wave Star WEC Based on average wave energy potential at European sites (WEC lifetime: 20 years, Interest of investment: 9%) Development factors Energy production: 1.0 Total investment: 1.0 Maintenance: 1.0 /kwh Development factors Energy production: 1.1 Total investment: Maintenance: Development factors Energy production: 1.5 Total investment: 0.1 Maintenance: Year 20
21 Activities in Wave Star at present The Roshage test section will actively be used as test platform for Power Take-Off optimization, test of other component/parts, and for getting maintenance data. Improvement of the structural design of the C5-machine, and optimization and reduction of systems for future machines Focus on reducing production and development cost for the next projects: Expertise from similar industries Focus on increasing the Power Take-Off efficiency: In collaboration with innovative companies and universities Agreement with utility company Find subsidiaries 21
22 Wave Star cracks the nuts! To stay in the sea Take energy out of waves Cost decreasing More efficient PTO The storm protection strategy effectively protects the Wave Star machines. The Roshage WEC has survived several storms with no severe damages and no service afterwards. The Roshage WEC is connected to the grid, and it has produced energy since January The measurements fits the expected power curve. The energy costs for the first full WEC will not be competitive to other conventional sources of energy. The calculated costs has already been decreased by 30 %, but further cost reduction is needed. The first test results have shown challenges in ensuring a high efficiency of the complete power transmission to the electrical grid. Projects on improvements are on-going with universities. 22
23 Please visit our website and get updated! 23
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