TM-SFW0205

2015.5.28 Japan Norway Energy Science Week , Met-ocean measurements and modeling for offshore wind energy

Development of Mitsubishi Electric’s wind lidar “DIABREZZA” ~ status and proposal for offshore wind energy~ 2015.5.28 Ｙｕｔａｋａ Ｋａｊｉｙａｍａ Shumpei Kameyama Mitsubishi Electric Corporation 1

Contents
What’s wind sensing lidar ?
Application of wind lidar for wind energy application
History of Mitsubishi wind lidar
Introduction of development ~Status and proposal for offshore wind energy ~

2 ©2015 Mitsubishi Electric Corporation

What’s wind sensing lidar ?

Wind sensing lidar radiates pulse-laser into the air, and receives back-scattered light from aerosols, then calculates wind speed as Doppler shifts. Range information are also obtained from round trip time .

Wind

(Movement of the Aerosols)

Transmitting light Display f RX = f 0 + f d

Backscattering light

Optical transceiver/ Receiver

fr = f0 + fd fd = 2Vfo/c

Signal Processor Optical Antenna Optical Mixer

fd : Doppler frequency f0 : Transmitting frequency fr : Received frequency c: Speed of light

3 ©2015 Mitsubishi Electric Corporation

Wind lidar for wind energy application Wind resource assessment (Ground-based lidar, Floating lidar)

Power performance testing & Wind turbine control (Nacelle mounted lidar)

Wind farm control (Long range, scanning lidar)

4 ©2015 Mitsubishi Electric Corporation

History of Mitsubishi Electric’s wind lidar (4) Ultra-long-range (>30 km) wind sensing

(1) Wind sensing using eye-safe (1.5 µm) wavelength region Nacelle mounted lidar (2003)

Long range lidar

Offshore campaign M. Kato et al., Proc. of symposium on wind energy utilization, (2006) Japanese Wind Energy Association, 2008.

Mitsubishi lidar “DIABREZZA” Photo: provided by Okinawa Power Electric Power Company

(5) New short range lidar Lidar for offshore wind resource assessment Nacelle mounted lidar

Portable & short range lidar

The lidar in the photo was delivered to Mie university

(2) Instrumentation of compact short range lidar

2000

(3) Product release of the short range pulsed lidar

2005

2010

2015

5

©2015 Mitsubishi Electric Corporation

DIABREZZA, compact ~ Vertical wind profiling lidar ~

Outline of product
Measures the vertical wind profile (horizontal wind speed, direction, and the vertical wind speed) of the altitude up to 250m
Selectable range resolution (20m/25m/30m)
Environmentally resistant for the use under severe outdoor conditions
Can be installed in a floating system for offshore applications
High performance (measurement accuracy, data availability) using the new function; “Adaptive Parameter Tuning” 6 ©2015 Mitsubishi Electric Corporation

Installation on floating system
Can be Installed in a floating system with motion correction and remote power control option Lidar Main Unit

Rinsing Fluid Tank

External unit (motion correction & remote power control) LAN connection (prepared by user)

LAN (5m)

Power, Signal, LAN cable (5m）

Hose (5m) Power cable (5m）

Power cable (5m）

DC+24V Power

7 ©2015 Mitsubishi Electric Corporation

First measurement campaign at European test site Measurement campaign at ECN (Netherlands) using the prototype model Period: 2013.10.30~2014.1.7 Field testsite

Office Office

Mast 4

Entrance

Office

Field testsite

Mast （100m）

Reference anemometer

Alkmaar

Lidar Amsterdam

-8-

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Validation result at ECN test site - Wind speed：a=0.986、R2=0.990 , Wind direction：a=1.002、R2=0.998  Satisfy the acceptance criteria of NORSEWInD Approved by ECN

Wind speed

Wind direction

-9-

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Recent measurement campaign Measurement campaign at the field in Hokkaido (Japan) was successfully completed

Photo & Data; Provided by Eurus Energy Holdings Corporation

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©2015 Mitsubishi Electric Corporation

Further plan
Collaboration with the floating system integrator Track record 1: ECN


Increasing the track record of measurement campaign especially in European test site

Track record 2: Eurus Energy

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Track record 3: (in Japan) Track record 4: (in Japan) Track record 5: (in Europe) Track record 6: (in Europe) Track record 7: (in Europe) ・・ ・ ©2015 Mitsubishi Electric Corporation

DIABREZZA, Nacelle mounted ~ Lidar for turbine performance testing & turbine control~

Outline of product
Measures the incoming wind with the distance up to 250m
Selectable range resolution (20m ~)

Optical Antenna Unit


Wind distribution measurement in a whole rotor plate with 9 beam configuration
High performance (measurement accuracy, data availability) using the new function; “Adaptive Parameter Tuning”

The lidar in the photo was delivered to Mie university

12 ©2015 Mitsubishi Electric Corporation

Current R&D for wind turbine control in Japan Summary on R&D program in FREA-AIST Summary on R&D program of MRI project

13 ©2015 Mitsubishi Electric Corporation

Nacelle mounted lidar is a promising tool for offshore wind energy Nacelle mounted lidar realizes … 1. “On site” power curve validation of wind turbines is possible for any wind direction “without any met mast” Extremely high installation cost for offshore met mast (> a few million euros) 2. Distinct increasing of selling electricity (For example, even 2 % improvement of power production produces the increasing selling electricity of > 200k euros / turbine / year for 5MW turbine) Power production capacity of offshore wind turbine is getting larger 3. Longer lifetime of wind turbine (a few tens of percent ?) by the effect of load reduction 14 ©2015 Mitsubishi Electric Corporation

DIABREZZA, scanning ~ Lidar for next generation wind resource assessment ~

Outline of product
Ultra long range wind sensing with the distance of > 8km
Range resolution: selectable
Hemispherical measurement using horizontal & vertical scanning

Photo; provided by Hokkaido University The range resolution of the lidar in the photo is selectable (30m, 60m, 90m).

15 ©2015 Mitsubishi Electric Corporation

Capability of ultra-long range wind sensing Wind velocity map measured with scanning Horizontal scan display

Vertical scan display,

Range resolution : 150m,

Range resolution : 75m

30km

15km

Data was acquired in the joint research of Electronic Navigation Research Institute & Mitsubishi Electric Corporation

16 ©2015 Mitsubishi Electric Corporation

Potential for wind energy application on scanning lidar We have tested for the wind resource assessment (using a compact scanning lidar), and results were fairly good. Comparison with met mast data Range: about 1.6 km Velocity (Lidar) [m/s]

Schematic of measurement method

1.6 km Velocity (Cup) [m/s] Photo & Data; provided by Eurus Energy Holdings Corporation

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©2015 Mitsubishi Electric Corporation

Proposal on utilizing long range scanning lidar Scanning lidar can be used for the new application of offshore wind energy which cannot be realized with vertical profiling lidars (1) Next generation, wide area wind resource assessment • Rough estimation of wind resource and determination of detailed assessment point • Offshore assessment is possible from onshore

(2) Wide area wind monitoring for wind farm control • The 30 km sensing can offer forecasting the coming frozen wind of 30 m/s in advance of 15 min

18 ©2015 Mitsubishi Electric Corporation

Conclusions Mitsubishi Electric Corporation has 3 types of wind lidar “DIABREZZA” for wind energy application 1. Compact lidar 2. Nacelle mounted lidar 3. Long range lidar for wind resource assessment for turbine control for wide area wind and power performance testing resource assessment

The lidar in the photo was delivered to Mie university

Lower photo; provided by Advanced Industrial Science and Technology The result was obtained at the ECN test site

Data was acquired in the joint research of Electronic Navigation Research Institute & Mitsubishi Electric Corporation

19 ©2015 Mitsubishi Electric Corporation

Thank you for your attention!!

20 ©2015 Mitsubishi Electric Corporation

New function: Adaptive parameter tuning Concept & User’s benefit

・Self-recognition of atmospheric condition by the analysis on the signal-to-noise ratio of the received signal. ・Automatic optimization of instrumental parameters Patents were filed by Mitsubishi Electric Corp. which fits best to the user’s needs. 20

Effect of parameter tuning

Example 1 Ensures available data by tuning measurement interval (for example, from 1s to 10s)

15

SNR [dB]

Schematic of range dependence of signal to noise ratio (SNR) 20

Normal atmospheric condition

10

Severe condition (for example, low aerosol density)

Detection threshold

5

5

Recognition of atmospheric condition & parameter tuning

Detection threshold

0 0

15 50

100

150 Range [m]

200

250

300

Data available even in severe atmospheric condition

100

150 Range [m]

200

250

300

Example 2 Ensures available data by tuning laser beam focus (for example, from 300m to 150m)

0 0

50

20

SNR [dB]

SNR [dB]

15

10

10

5

Detection threshold

0 0

50

100

150 Range [m]

200

250

300

21

©2015 Mitsubishi Electric Corporation