new challenges and technologies of floating pv power station new challenges and technol… ·...

© 2017 SUNGROW Confidential

New Challenges and Technologies of Floating PV Power Station

Dr. Huaxiang Li

Division of SunFloat, SUNGROW

28 Feb. 2018

Contents

Introduction of SunFloat 01

Key technologies of floating PV 02

New challenges of floating PV 03

New technologies of floating PV 04

www.sungrowpower.com

Introduction of SunFloat

The factory of floating modules has the area of more than 10,000 square meters and the warehousing capacity is more than 3MW.

The first supply of floating modules is for a 40MW floating PV project.


01 Sungrow Floating Module Sci. & Tech. Co., Ltd. (SunFloat) is a wholly-owned subsidiary of Sungrow Power Supply Co.,

Ltd. SunFloat focuses on the research and design of floating system solutions including floating modules, weathering

materials, PV floating array and anchoring system. Special honors were obtained: ‘2017 China PV Gold medal for

floating products’, ‘Annual most influential Floating PV power station’, and ‘Best PV Smart Factory’.

More than 30 sets of large blow molding and ancillary equipment and the annual production capacity for 800MW PV floating power station.

Introduction of SunFloat：Floating modules


01

Used for PV panels installation

Easy for ventilation and heat

dissipation

Large buoyancy and high safety margin

O&M channel (short)

Anti-slip design of surfaces

Large concentrated loading

capacity

O&M channel (long)

Anti-slip design of surfaces

Used for combiner box

Cable channel

O&M channel

SF-M3 Main float

Walkway float

Connection float

Combiner box float

Floats assembly diagram

Introduction of SunFloat ：Representative projects


01

3MW demonstration project

in Taiwan Experimental project

in Daqing

100MW project

in Xinji, Fengtai

40MW project

in Panji, Huainan

150MW project

in Guqiao, Fengtai 50MW project

in Weishan, Shandong

Contents






Abandoned mines,

reservoirs and mining

collapse zones can be used.

Less water evaporation, and

growth of algae

No shelter on PV panels,

convenient to clean


Saving land resources

Protecting water resource Convenient O&M strategy

Motivations and advantages of floating PV


Milestones of floating PV

2009-2011: Ideas from British and

American engineers

2012-2014: Experimental projects in

Japan

2015- now: Standardization and practices

of large capacity stations

Effective water-cooled

ventilation, 10% more power

generated

More power generated



aging problem of natural light (uv).

aging problem of thermo-oxidation

stress fatigue of cold-hot alternation

Polluted water from microbes or industrial wastes.

Buoyancy requirements: fixed load, snow load, and O&M loads.

Operation safety and reliability: wind, wave, current, water level changes.

Anti-fatigue performance: periodic stress.

Layout design of anchoring system

Design inputs

Simulation and analysis

Detailed design

Float products & materials

Floating structures and array

Anchoring system

System design

Complex environmental conditions

economy and cost control


Key technologies of floating PV: System design 02

• Wind load • Wave & current

• Cable flexible connection • Refined consumption

• Sunlight • Temperature

• Water area • Bottom topography • Water lever • Marine growth

• Cost estimation • Benefit guaranty

• Array displacement • Cable consumption

• Coupled effect • Multi-point mooring

• Underwater monitoring • Real-time smart O&M

Site survey

Climate Environment Economy

Array layout Anchoring system Electrical system

Operation &

Maintenance


Key technologies of floating PV：Floating structures and array 02

Contents







New challenges of floating PV

03

Pressure from price and cost

Industry standards and design codes

Adaptability of complicated environmental conditions

Extended to inshore water

Standardization and diversification of system design

Optimization of float modules

Reliability of anchoring system



Codes：Currently refer to the design codes of construction industry.

Technologies：Lack of theoretic basis and industrial experiences.

Price trends & expectations Floating PV design codes and technologies ?

Price of one watt/W (RMB)



Adaptability of complicated environmental conditions & Extended to inshore water

Extremely cold region

Gales and big waves

Coastal region

Deep water and wide change of water levels Complicated underwater environment and lake bed

Contents






System Anchoring

Product

More reliable anchoring system design based on offshore engineering

Optimized design of system solution

Product design based on fluid dynamics and structural analysis


Material More reliable and advanced float materials



Gap

（m）\Angle

（°）

5 6 7 8 9 10

2.4 0.006007 0.006015 0.006024 0.006035 0.006047 0.006062

2.5 0.006249 0.006256 0.006266 0.006277 0.006290 0.006305

2.6 0.006490 0.006498 0.006508 0.006519 0.006533 0.006548

Table 1: The ratio between covering area and power generation

The Back to back layout scheme

The back to back layout satisfies the requirement of best inclination angle and gap

to generate more power. It works with higher utilization coefficient of water area,

larger range of adjustable azimuth, larger adaptability to water conditions and

more convenient installation.

The back to back layout scheme reduces the cost through using less walkway float

modules.

Providing more resistance to anti-overturn of floats from big wind.

New technologies of floating PV：System design 04


Determination of environmental loads

Wind, wave, current, ice loads based on CFD

calculation/experimental verification

Time domain analysis of anchoring system

（Orcaflex/AQWA）

Maximum anchoring tension, material selection,

strength check, and displacement check for the

anchoring system

Design procedure and methods based on the offshore engineering

New technologies of floating PV：Anchoring system design 04

-6

-5

-4

-3

-2

-1

0

-10 0 10 20

z(m

)

u(cm/s)

风速

15m/s 风速

20m/s 风速

25m/s

Wind speed


Wind-induced current velocity

Wind, wave and current loads based on the offshore codes

New technologies of floating PV：Anchoring system design 04

288.62

75.85 60.01

0

50

100

150

200

250

300

350

Forc

e/K

N

Force types

0°azimuth, total wind, wave and current force

Wind Force Current Force Wave Force

Environmental conditions：

1. Wind load for wind speed 30m/s.

2. Current load for current velocity as 1m/s, more universal.

3. Wave load for the typical inland lake wave，wave period 1.5-5s，wave height 1.2m，and water depth 8m.


New technologies of floating PV：Advanced float materials 04

Super anti-weathering

anti-aging design

Physical protection methods

UV light screening

agent

Carbon black, titanium

dioxide

Light

absorber

Alloy

blend

Surface

coating

Chemical protection methods

UV light absorber

Diphenyl ketone

Benzotriazole

Triazine

Benzoxazone

Blocked

benzoate.

Hindered amine

Antioxygen

Hindered phenol

Thioester

Antioxidants mixture

Antifatigue


1）Prediction of environmental loads of floating array:

Calculation of the environmental loads for PV panels and floating modules;

Shielding effect between different parts in a floating array;

Fast prediction of environmental loads for any array.

Wind loads of array Wind load coefficients of array

New technologies of floating PV：Numerical simulation for environmental loads 04


2）Fatigue analysis of structures:

Design life of PV power stations;

Development of fatigue method for floating PV structures;

More comprehensive material aging tests;

Long-term observation and measurement of environmental conditions.

Material aging test Material creep test

04 New technologies of floating PV：Numerical simulation for design life


04

3）Coupled analysis of floating array-anchoring system:

More precise calculation based on coupled analysis;

Optimization of parallel hardware and software tools;

Big data storage, analysis, and utilization;

Optimized design of floating array and anchoring system.

New technologies of floating PV：Numerical simulation for array design


04

New-generation of SunFloat products

New technologies of floating PV：Numerical simulation for product design

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