preliminary study of a guywire supported single point moored … · preliminary study of a guywire...

1CDTI-NEDO Joint Workshop on Offshore Wind

CDTI-NEDO Joint Workshop on Offshore Wind

Kitakyushu, 8th of July 2019

Preliminary Study of a Guywire Supported Single Point Moored Floating Offshore Wind Turbine System

Shigeo Yoshida, Professor

Research Institute for Applied Mechanics

Kyushu University


Table of Contents

1. Introduction

2. Project Outline

3. Design Outline

4. At-Sea Experiment

5. Summary

Reference: Report W-03, FY2018 NEDO Report Meeting, 2018.


1. Introduction

1. Introduction

2. Project Outline

3. Design Outline


5. Summary


⚫ Goals:

- LCOE Reduction

- High Penetration

⚫ Approaches:

- Aero-/Hydro-dynamics

- Aero-elastics

- Control

Diversify Wind Energy Technologies

Incr

easi

ng

Size

of

Win

d T

urb

ine

s an

d W

ind

Far

ms

Wake Modeling

Kite Wind Power

Wind Farm Layout

Aerodynamics (IEA Wind)

Aero/Elastic/Control Models

Multi-Rotor System

Floating DTs(MOE/METI/CEPCO)

Innovative Floating DT (NEDO)

Super-Large WT

Control (JSCE)

Commercial DTs(IEA Wind/NEDO)

Commercial

Future

Future

1.1 Research Outlines of KU-RIAM-REIUS

Hydrodynamics


2. Project Outline

1. Introduction

2. Project Outline

3. Design Outline


5. Summary


2.1 Project Outline

D=140mP=6MW

Total2,400t (excl. ballast)=160kg/m2

Turretmooring

Guywire

Hybridfloater

Super Compact DriveDownwind rotorFixed yaw

System Outline

Inclinedtower

• Project: Next Generation Floating Offshore Wind Turbine System Demonstration Project (Elemental Technologies), NEDO

• Term: 2016/12-2018/03

• Goal: 20JPY/kWh (2030)

• Representative Technical Problems

- Guywire supported steel-PC structure.

- Turret + catenary mooring.

- Yawing characteristics.


2.2 Scheme and ResponsibilitiesC

o-P

ro

po

sers

Reco

mm

isio

nin

gs

Resp

on

sib

ilit

y

Flo

ati

ng

Tu

rb

ine D

esi

gn

Co

up

led

An

aly

sis

Mo

del,

Desi

gn

Lo

ad

Flo

ate

r-T

ow

er

Desi

gn

Tu

rret

Desi

gn

, M

an

ufa

ctu

rin

g, T

est

Fu

ll S

teel

Flo

ate

r B

asi

c D

esi

gn

Ma

nu

factu

rin

g, C

on

stru

cti

on

, M

on

ito

rin

g

Gu

y W

ire T

en

sio

n T

un

ing

an

d M

on

ito

rin

g

Mari

ne G

row

th P

rote

cti

on

Co

nst

ructi

on

Flo

ate

r P

art

s F

ab

ricati

on

Tri

al

an

d T

est

Tan

k T

est

Ela

stic

Mo

del

Ta

nk

Test

Mo

ori

ng

Tan

k T

est

Sti

ff M

od

el

Tan

k T

est

Ela

stic

Mo

del

Tan

k T

est

Fu

rth

er I

mp

ro

vem

en

t

To

wer

Cro

ss S

ecti

on

Co

ntr

ol

Gu

yw

ire L

igh

tnin

g T

est

Desi

gn

Co

nd

itio

n

Eco

no

mic

s E

va

lua

tio

n

Eco

no

mic

Ev

alu

ati

on

At-

Sea

Ex

perim

en

t

Mo

del

Ex

peri

men

t

NEDO

T1

T1

-1

T1

-2

T1

-3

T1

-4

T2

T2

-1

T2

-2

T2

-3

T2

-4

T2

-5

T3

T3

-1

T3

-2

T3

-3

T4

T4

-1

T4

-2

T4

-3

T4

-4

T5

T5

-1

T6

T6

-1

T6

-2

L aerodyn Japan T1) Floating Turbine Design O O O O O

L Kansai Design Co Float Dynamics, Mooring o O

L Fuji PS T2) Manufacturing, Construction, Monitoring O O

L Komaihaltec Tower, Guywire O

L Tsuneishi Shipbuilding Floater Steel Structure O o

L Yorigami Marine Const Construction O

L NMRI T3) Tank Test O O O O

L Univ. of Tokyo(Suzuki) Floater Test Result Evaluation o o o

L Osaka Pref. Univ. Floater Test Data Analysis o o o

L Kyushu Univ. T4) Further Improvement, T6) At-Sea Exp O o O O O O O

L Univ. of Tokyo(Arakawa) Tower Aerodynamics O

L Glocal T5) Economics Evaluation O O O


3. Design Outline

1. Introduction

2. Project Outline

3. Design Outline


5. Summary


3.1 Dimensions


3.2 Stability

Damage CriteriaMost Critical Value

Damage Condition at Most CriticalItem Required Damaged Compartment AxisGM > 1.0 m 34.66 m UW Leg Compartment All

2nd - 1st intercepts > 7.0° 24.87° SB DW Connector 270°Area Ratio > 1.0 5.48 SB DW Connector 180°

Inclination after damage < 17° 9.66° SB DW Leg Compartment 150°

Damage CriteriaMost Critical Value

Damage Condition at Most CriticalItem Required Damaged Compartment AxisGM > 1.0 m 11.03 m SB DW Buoy Compartment All

2nd - 1st intercepts > 7.0° 21.20° UW Connector 330°Area Ratio > 1.0 6.21 UW Connector 270°

Inclination after damage < 17° 10.34° UW Connector 270°

Damage Stability:Operation (Top)

Intact Stability:Operation (Left)Towing (Right)

Towing (Bottom)


3.3 Floater PC Structure

Deformation at 1 Wire Failure

Stress at an Ultimate Condition (PC)


3.4 Guywire Tension


3.5 Yaw Characteristics


4. At-sea Experiment

1. Introduction

2. Project Outline

3. Design Outline


5. Summary


4.1 At-sea experiment

App. 7m

Anchor Radius=30~40m

Ro

tor

Dia

me

ter=

14

m

Hu

b H

eig

ht=

Ap

p.

10

m

Ap

p. 1

0m

12

m

Water Depth around the Site[NEDO, NeoWins, 2018]


4.2 Power Production Characteristics

(1) Power Production Characteristics

• Power production characteristics were confirmed.

• The yaw misalignment of the floater was shown to be smaller as wind speed increases.


4.3 Idling Characteristics

(2) Idling Characteristics

• The yaw misalignments is smaller as wind speed increases.

• It is about 7deg 6m/s (19m/s at full scale).


4.4 Start-up and Emergency Stop Characteristics

(3) Start-up Characteristics

• The rotor yawing moment directs the floater to minus.

(4) Emergency Stop Characteristics

• The floater inclines from +2.5deg to -4.0deg in the emergency stop.


5. Summary

1. Introduction

2. Project Outline

3. Design Outline


5. Summary


5.1 Summary

• Typical design conditions were defined.

• Wind turbine, floater, and the mooring system were designed for the assumed design condition.

• The PC (prestressed concrete) was shown to be strong and stiff enough through the manufacturing trial tests.

• Procedures of production and installation were planned.

• Basic characteristics were measured through the tanks tests of 1:30 stiff model, 1:15 elastic model, mooring characteristics, guywire supported model, and 1:10 at-sea experiment.

• At 5 units at 8m/s of annual wind speed 20JPY/kWh.

• Tower aerodynamic characteristics were measured at the high Reynolds number wind tunnel test.

THANK YOU

ありがとうございます

GRACIAS

Shigeo Yoshida

[email protected]

Research Institute for Applied Mechanics,

Kyushu University

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preliminary study of a guywire supported single point moored … · preliminary study of a guywire...

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