Francesco Boscolo, member of Tecnalia Offshore Energy Area, presents at FOWT 2018 conference in Marseille a methodology for the design of an umbilical cable for floating offshore platforms, based on static and dynamic analysis in a time domain approach, in order to get a significative time-consuming reduction in the design stage.
Introduction to Arduino Programming: Features of Arduino
Microsoft power point fowt2018-boscolofrancesco_v2.pptx
1. April 25th, 26th & 27th 2018 1
Roundtable moderated by Alfredo PARRES
BRINGING ELECTRICITY BACK TO SHORE :
GRID ISSUES, METHODS, SOLUTIONS AND INNOVATIONS
2. April 25th, 26th & 27th 2018 2
Francesco Boscolo Papo, Researcher, Offshore Energy Area, Tecnalia R&I
A METHODOLOGY FOR TECHNO-ECONOMIC
DESIGN OF THE UMBILICAL CABLE
FOR FLOATING OFFSHORE RENEWABLE ENERGY STRUCTURES
3. April 25th, 26th & 27th 2018 3
TECNALIA
Offshore Energy Area
SINCE 2003
OUR TEAM CARRIES
OUT RESEARCH IN
OFFSHORE ENERGY
SECTOR
OCEANTEC ENERGÍAS MARINAS S.L.
Joint Venture with the main objective of developing a floating
oscillating water column wave energy converter.
NAUTILUS FLOATING SOLUTIONS
A joint venture to develop a floating platform for offshore wind turbines
with the objective of providing the lowest cost of energy by minimizing
logistics from the very early design stages.
EU FP7 funded research project that aims to provide an important
breakthrough in offshore wind industrial solutions by designing an
innovative, lightweight, robust and reliable 10 MW class offshore wind
turbine based on a superconducting synchronous generator patented by
TECNALIA.
SUPRAPOWER
(SUPERCONDUCTING,
RELIABLE, LIGHTWEIGHT,
AND MORE POWERFUL
OFFSHORE WIND TURBINES)
CONNECTORS FOR FLOATING DEVICES It is
a submarine cable to device or floating
platform connection solution that includes
common electrical components used in
onshore applications. Besides the power cables
(13,2 kV) the connector also connects low
voltage cables for ancillary equipment and fiber
optic cables for data transmission.
HARSHLAB
Offshore laboratory for testing of renewable
energy components in harsh enviroment
4. 1. Method behind the design
• Static design tool;
• Umbilical cable designed as a simple catenary line;
• Floating modules modelled as inverse catenary lines;
• A catenary curve is governed by a hyperbolic cosine function:
ZB
ZS
X
Fairlead
point
Touchdown
point
For a simplified analysis, we impose that: ZS = ZB = Z
Sag bend
Arch bend
Only 2 design
parameters
Only 2 design
parameters
· ·
1) An adequate bending radius,
larger than the Allowable
Bending Radius (ABR)
Constraints in the umbilical cable design:
2) The maximum analyzed
tension in the umbilical cable
shall be under a maximum
value
• Mean position (no offset)
• Far position (positive offset)
• Near position (negative offset)
3 positions analysis:
April 25th, 26th & 27th 2018 4
5. 4. Study case: 66kV umbilical cable for Floating Offshore Wind Platforms
• Here is presented a methodology for the design of an umbilical cable characterized by 66kV voltage and designed
for Offshore Wind Energy Platforms.
• Water Depth of 60m
• Umbilical cable of 66kV (500mm2 copper section; 169mm external diameter; about 70kg/m linear mass)
• Lazy Wave shape
• ULS analysis characterized by a TR=50 years, HS=14.00m sea state, VC=1.31m/s current
Orcaflex
model
Orcaflex
model
April 25th, 26th & 27th 2018 5
6. 70 75 80 85 90 95 100 105 110 115 120
5 0,572 0,507 0,453 0,407 0,368 0,335 0,306 0,281 0,259 0,239 0,222
6 0,565 0,501 0,447 0,402 0,363 0,330 0,302 0,277 0,255 0,235 0,218
7 0,558 0,494 0,441 0,396 0,358 0,325 0,297 0,272 0,251 0,232 0,215
8 0,551 0,487 0,435 0,390 0,353 0,320 0,292 0,268 0,247 0,228 0,211
9 0,543 0,481 0,428 0,384 0,347 0,315 0,288 0,264 0,242 0,224 0,207
10 0,536 0,473 0,422 0,378 0,342 0,310 0,283 0,259 0,238 0,220 0,203
11 0,528 0,466 0,415 0,372 0,336 0,305 0,278 0,254 0,233 0,215 0,199
12 0,519 0,458 0,408 0,365 0,330 0,299 0,272 0,249 0,229 0,211 0,195
13 0,511 0,450 0,400 0,359 0,323 0,293 0,267 0,244 0,224 0,206 0,191
14 0,501 0,442 0,393 0,352 0,317 0,287 0,261 0,239 0,219 0,202 0,186
15 0,492 0,433 0,385 0,344 0,310 0,281 0,255 0,233 0,214 0,197 0,182
16 0,482 0,424 0,377 0,337 0,303 0,274 0,249 0,228 0,209 0,192 0,177
17 0,472 0,415 0,368 0,329 0,296 0,267 0,243 0,222 0,203 0,187 0,173
18 0,461 0,405 0,359 0,321 0,288 0,260 0,236 0,216 0,197 0,182 0,167
19 0,449 0,395 0,350 0,312 0,280 0,253 0,230 0,209 0,192 0,176 0,162
20 0,438 0,384 0,340 0,303 0,272 0,245 0,222 0,203 0,185 0,170 0,157
21 0,425 0,372 0,329 0,293 0,263 0,237 0,215 0,196 0,179 x x
22 0,411 0,360 0,318 0,283 0,254 x x x x x x
23 0,397 x x x x x x x x x x
24 x x x x x x x x x x x
CURVATURE
[1/m]
Horizontal footprint, X [m]
Verticaldistance,Z[m]
70 75 80 85 90 95 100 105 110 115 120
5 0,572 0,507 0,453 0,407 0,368 0,335 0,306 0,281 0,259 0,239 0,222
6 0,565 0,501 0,447 0,402 0,363 0,330 0,302 0,277 0,255 0,235 0,218
7 0,558 0,494 0,441 0,396 0,358 0,325 0,297 0,272 0,251 0,232 0,215
8 0,551 0,487 0,435 0,390 0,353 0,320 0,292 0,268 0,247 0,228 0,211
9 0,543 0,481 0,428 0,384 0,347 0,315 0,288 0,264 0,242 0,224 0,207
10 0,536 0,473 0,422 0,378 0,342 0,310 0,283 0,259 0,238 0,220 0,203
11 0,528 0,466 0,415 0,372 0,336 0,305 0,278 0,254 0,233 0,215 0,199
12 0,519 0,458 0,408 0,365 0,330 0,299 0,272 0,249 0,229 0,211 0,195
13 0,511 0,450 0,400 0,359 0,323 0,293 0,267 0,244 0,224 0,206 0,191
14 0,501 0,442 0,393 0,352 0,317 0,287 0,261 0,239 0,219 0,202 0,186
15 0,492 0,433 0,385 0,344 0,310 0,281 0,255 0,233 0,214 0,197 0,182
16 0,482 0,424 0,377 0,337 0,303 0,274 0,249 0,228 0,209 0,192 0,177
17 0,472 0,415 0,368 0,329 0,296 0,267 0,243 0,222 0,203 0,187 0,173
18 0,461 0,405 0,359 0,321 0,288 0,260 0,236 0,216 0,197 0,182 0,167
19 0,449 0,395 0,350 0,312 0,280 0,253 0,230 0,209 0,192 0,176 0,162
20 0,438 0,384 0,340 0,303 0,272 0,245 0,222 0,203 0,185 0,170 0,157
21 0,425 0,372 0,329 0,293 0,263 0,237 0,215 0,196 0,179 x x
22 0,411 0,360 0,318 0,283 0,254 x x x x x x
23 0,397 x x x x x x x x x x
24 x x x x x x x x x x x
CURVATURE
[1/m]
Horizontal footprint, X [m]
Verticaldistance,Z[m]
5. Static analysis: Curvature Matrix
Admissible Curvature:
Low
Dynamic analysis
Selection of some
combinations for 2nd step:
1
12 ·
0,493
1
Objective of the analysis:
Minimize the Curvature < AC
High
CurvatureCurvature
April 25th, 26th & 27th 2018 6
7. 70 75 80 85 90 95 100 105 110 115 120
5,0 1,475 1,706 1,937 2,208 2,479 2,722 2,966 3,163 3,361 3,559 3,758
6,0 1,472 1,710 1,948 2,202 2,457 2,695 2,932 3,137 3,342 3,528 3,715
7,0 1,469 1,714 1,958 2,197 2,436 2,667 2,899 3,111 3,324 3,498 3,672
8,0 1,466 1,718 1,969 2,192 2,414 2,639 2,865 3,085 3,305 3,467 3,629
9,0 1,463 1,722 1,980 2,186 2,392 2,612 2,832 3,059 3,287 3,436 3,585
10,0 1,460 1,726 1,991 2,181 2,370 2,584 2,798 3,033 3,268 3,405 3,542
11,0 1,445 1,702 1,959 2,145 2,331 2,524 2,717 2,941 3,166 3,305 3,444
12,0 1,429 1,678 1,928 2,110 2,292 2,464 2,636 2,850 3,064 3,205 3,346
13,0 1,413 1,655 1,896 2,074 2,253 2,404 2,555 2,758 2,961 3,105 3,248
14,0 1,397 1,631 1,864 2,039 2,214 2,344 2,474 2,667 2,859 3,004 3,150
15,0 1,381 1,607 1,833 2,004 2,174 2,284 2,393 2,575 2,757 2,904 3,051
16,0 1,374 1,569 1,765 1,908 2,050 2,158 2,265 2,440 2,616 2,777 2,939
17,0 1,367 1,532 1,697 1,812 1,926 2,032 2,137 2,306 2,474 2,650 2,826
18,0 1,359 1,494 1,629 1,715 1,802 1,906 2,009 2,171 2,332 2,523 2,713
19,0 1,352 1,456 1,561 1,619 1,678 1,780 1,882 2,036 2,191 2,396 2,600
20,0 1,344 1,418 1,493 1,523 1,554 1,654 1,754 1,902 2,049 2,268 2,487
21,0 1,337 1,381 1,424 1,427 1,430 1,528 1,626 1,767 1,908 x x
22,0 1,329 1,343 1,356 1,331 1,306 x x x x x x
23,0 1,322 x x x x x x x x x x
24,0 x x x x x x x x x x x
CURVATURE
DAF
Horizontal footprint, X [m]
Verticaldistance,Z[m]
6. Dynamic analysis (a): Dynamic Amplification Factors for Curvature
DAF directly proportional to X
DAF inversely proportional to Z
Curvature DAF
Increasing = f(X)
Increasing=f(Z)
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+)$)% &'($)&'*
Low High
April 25th, 26th & 27th 2018 7
8. 70 75 80 85 90 95 100 105 110 115 120
5 0,844 0,865 0,877 0,899 0,913 0,912 0,908 0,889 0,870 0,851 0,833
6 0,832 0,856 0,871 0,884 0,892 0,890 0,885 0,868 0,852 0,831 0,810
7 0,820 0,847 0,864 0,870 0,872 0,868 0,861 0,848 0,834 0,810 0,788
8 0,808 0,837 0,856 0,855 0,851 0,846 0,838 0,827 0,815 0,790 0,765
9 0,795 0,827 0,848 0,840 0,830 0,823 0,815 0,806 0,797 0,769 0,743
10 0,782 0,817 0,839 0,825 0,809 0,801 0,791 0,785 0,778 0,748 0,720
11 0,762 0,793 0,813 0,798 0,782 0,769 0,754 0,748 0,739 0,712 0,686
12 0,742 0,769 0,786 0,771 0,755 0,736 0,718 0,710 0,701 0,676 0,653
13 0,721 0,745 0,759 0,744 0,728 0,704 0,682 0,673 0,663 0,641 0,620
14 0,701 0,721 0,732 0,717 0,701 0,673 0,646 0,637 0,626 0,606 0,587
15 0,680 0,696 0,706 0,690 0,674 0,641 0,611 0,601 0,590 0,572 0,555
16 0,663 0,666 0,665 0,643 0,621 0,592 0,564 0,555 0,546 0,533 0,521
17 0,645 0,636 0,625 0,596 0,570 0,543 0,519 0,511 0,503 0,495 0,488
18 0,626 0,605 0,585 0,550 0,519 0,496 0,475 0,468 0,461 0,458 0,454
19 0,608 0,575 0,546 0,505 0,470 0,450 0,432 0,426 0,420 0,422 0,422
20 0,588 0,545 0,507 0,461 0,422 0,405 0,390 0,385 0,380 0,386 0,390
21 0,568 0,514 0,469 0,419 0,376 0,362 0,349 0,346 0,341 x x
22 0,547 0,484 0,432 0,377 0,331 x x x x x x
23 0,524 x x x x x x x x x x
24 x x x x x x x x x x x
CURVATURE
[1/m]
Horizontal footprint, X [m]
Verticaldistance,Z[m]
70 75 80 85 90 95 100 105 110 115 120
5 0,844 0,865 0,877 0,899 0,913 0,912 0,908 0,889 0,870 0,851 0,833
6 0,832 0,856 0,871 0,884 0,892 0,890 0,885 0,868 0,852 0,831 0,810
7 0,820 0,847 0,864 0,870 0,872 0,868 0,861 0,848 0,834 0,810 0,788
8 0,808 0,837 0,856 0,855 0,851 0,846 0,838 0,827 0,815 0,790 0,765
9 0,795 0,827 0,848 0,840 0,830 0,823 0,815 0,806 0,797 0,769 0,743
10 0,782 0,817 0,839 0,825 0,809 0,801 0,791 0,785 0,778 0,748 0,720
11 0,762 0,793 0,813 0,798 0,782 0,769 0,754 0,748 0,739 0,712 0,686
12 0,742 0,769 0,786 0,771 0,755 0,736 0,718 0,710 0,701 0,676 0,653
13 0,721 0,745 0,759 0,744 0,728 0,704 0,682 0,673 0,663 0,641 0,620
14 0,701 0,721 0,732 0,717 0,701 0,673 0,646 0,637 0,626 0,606 0,587
15 0,680 0,696 0,706 0,690 0,674 0,641 0,611 0,601 0,590 0,572 0,555
16 0,663 0,666 0,665 0,643 0,621 0,592 0,564 0,555 0,546 0,533 0,521
17 0,645 0,636 0,625 0,596 0,570 0,543 0,519 0,511 0,503 0,495 0,488
18 0,626 0,605 0,585 0,550 0,519 0,496 0,475 0,468 0,461 0,458 0,454
19 0,608 0,575 0,546 0,505 0,470 0,450 0,432 0,426 0,420 0,422 0,422
20 0,588 0,545 0,507 0,461 0,422 0,405 0,390 0,385 0,380 0,386 0,390
21 0,568 0,514 0,469 0,419 0,376 0,362 0,349 0,346 0,341 x x
22 0,547 0,484 0,432 0,377 0,331 x x x x x x
23 0,524 x x x x x x x x x x
24 x x x x x x x x x x x
CURVATURE
[1/m]
Horizontal footprint, X [m]
Verticaldistance,Z[m]
6. Dynamic analysis (b): Interpolated Dynamic Curvature limited by AC
Curvature
0,493
1
Low High
Admissible Curvature:
April 25th, 26th & 27th 2018 8
Analogous analysis for Tension
70,0 75,0 80,0 85,0 90,0 95,0 100,0 105,0 110,0 115,0 120,0
5,0 89,0 92,7 96,4 98,4 100,5 100,9 101,3 106,7 112,4 115,5 118,8
6,0 86,0 89,1 92,4 94,4 96,5 97,3 98,2 102,1 106,2 109,7 113,4
7,0 83,1 85,7 88,5 90,5 92,6 93,8 95,1 97,6 100,2 104,1 108,2
8,0 80,3 82,4 84,6 86,7 88,8 90,5 92,2 93,3 94,4 98,7 103,2
9,0 77,5 79,2 80,9 83,0 85,2 87,2 89,4 89,0 88,7 93,4 98,2
10,0 74,8 76,0 77,3 79,4 81,6 84,1 86,7 85,0 83,2 88,2 93,5
11,0 71,7 72,9 74,1 76,3 78,6 81,3 84,1 82,7 81,1 86,0 91,2
12,0 68,7 69,9 71,2 73,4 75,7 78,6 81,7 80,5 79,2 84,0 89,1
13,0 65,8 67,0 68,3 70,6 73,0 76,1 79,5 78,5 77,6 82,3 87,3
14,0 63,0 64,2 65,5 67,9 70,4 73,8 77,4 76,8 76,1 80,8 85,8
15,0 60,3 61,6 62,9 65,4 68,0 71,7 75,6 75,3 75,0 79,7 84,8
16,0 58,8 60,3 62,0 64,5 67,2 70,9 74,9 76,1 77,3 87,6 98,9
17,0 57,4 59,2 61,3 63,9 66,8 70,5 74,6 77,4 80,5 96,9 115,0
18,0 56,1 58,4 60,9 63,7 66,8 70,7 75,0 79,7 84,9 108,4 134,7
19,0 55,2 57,9 60,9 64,0 67,5 71,8 76,6 83,5 91,5 124,0 161,4
20,0 54,7 57,9 61,6 65,2 69,4 74,4 80,2 90,5 102,7 148,6 204,3
21,0 54,8 58,9 63,5 68,2 73,6 80,2 88,3 104,6 125,2 x x
22,0 56,1 61,5 68,1 74,6 83,0 x x x x x x
23,0 60,1 x x x x x x x x x x
24,0 x x x x x x x x x x x
TENSION
[kN]
Verticaldistance,Z[m]
Horizontal footprint, X [m]
Tension
10. 8. Summary of design procedure
Selection of reasonable ranges
for horizontal footprint and vertical distance for the study case
Run a static analysis
for all the resulted combinations
Run a dynamic analysis
for some combinations among those selected
Find out the DAFs
for Curvature and Tension
Calculate the interpolated results
and complete the whole matrix of dynamic results
Select the optimum configuration,
after taking into account all the output parameters (length, number of floaters, cost)
Run a series of dynamic simulations considering the adequate campaign of DLCs
Verify that the selected combination is actually the optimum one; in case it is not, go
back to the matrix of interpolated results and select another configuration
Iterative
procedure
Iterative
procedure
April 25th, 26th & 27th 2018 10
