Shadow Impact Module Version 3 Quick Information - Cape Cod ...

Shadow Impact Module
Version 3
Quick Information
NorthTec GmbH
WINDTEST
Kaiser-Wilhelm-Koog GmbH

Shadow Impact
During sunny times of the day, the operation of wind
turbine generators (WTG) may cause annoying
periodic shadow impact to adjacent buildings. For this
reason, building permits for the erection of WTGs
increasingly demand the integration of automatic shutdown
devices in order to prevent adjacent buildings
from being impacted more than acceptable according
to the recommended values. The shadow impact
module introduced herein serves as a technical
solution for meeting these demands.
Functionality
The light sensor of the shadow impact module
periodically measures the intensity of the sun’s visible
radiation. Using the results, the module determines
whether the intensity of the visible direct sun radiation
is capable of causing shadow impact. At the same
time, the shadow impact module calculates whether
shadow impact occurs in a place of immission. In case
the intensity of the direct sun radiation is capable of
causing shadow impact and shadow impact is
detected in a place of immission, the counters for daily
and annual shadow impact are updated in cycles of 1
minute. If one of the limit values set is exceeded in this
place of immission , the WTG responsible is shut
down for the duration of the shadow impact. Because
the calculations require the exact time, the shadow
impact module is equiped with a radio controlled clock.
Planing Information
One shadow impact module can control the shadow
impact of up to fifty WTGs in up to 100 places of
immission and log the information of a full year. When
limit values are exceeded, up to 12 WTGs can be shut
down. In cases where more than 12 WTGs may need
to be shut down, several shadow impact modules can
be operated in parallel. A telecommunication cable or
optical waveguide network existing on the wind farm
can be used to control the WTG. The radiation sensor
and the radio controlled clock need to be connected
electrically to the shadow impact module. Therefore,
when erecting the WTG, provide for cabling from the
outside to the inside of the WTG (e.g. through an
empty conduit or an existing drilling hole in the tower).
Programming
For programming of the shadow impact module, the
location coordinates (Gauss-Krueger) of the WTG and
of the place of immission to be monitored are required
(see Appendix A). Places of immission may be
indicated by several walls and areas. Separate day
and year limit values can be defined for each place of
immission. All data may be adjusted to the current
conditions using the keyboard at any time.
Unauthorized access to the data can be avoided by
setting a password.
Log Function (Optional)
The shadow impact module logs relevant shadow
impact events over at least one year. Each log entry is
assigned with a corresponding time stamp. The log
data may be retrieved in the shadow memory software
using the serial interface of the shadow impact
module. Manipulating the logs is not possible.
Sound Option
The sound option of the shadow impact module
enables shutting down the WTG for predefined periods
of time. These periods which can be defined for each
WTG individually may refer to certain days of the week
or certain periods specified by date.
Installation
The shadow impact module is installed in the tower
base of the WTG using upright consoles. The cabinet
is powered by a 230 Volts AC Mains Power source.
For each WTG to be controlled, there is a floating
relay contact (normally closed contact/ normally open
contact) available. The light sensor and the radio
controlled clock are mounted directly to the outside of
the tower using a stainless clamp causing absolutely
no damage to the tower or its structure (Fig. 1). When
positioning the radiation sensor, shadowing effects
caused by obstacles such as tree rows or other WTGs
must be avoided by all means.
Fig. 1: Sensor mounted to the tower of a WTG
Note:
A calendar specifying the shut-down times is not
required.
Changes and errors excepted; Version 2003-09
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Appendix A: Configuration Data
Example of a place of immission with a relevant house wall and a patio area
General Data
Height above sea level: 45 m
Maximum duration of shadow impact per day: 30 min.
Maximum duration of shadow impact per year: 480 min.
Description of house wall
Description of patio area
x-corner coordinate 1: 350 7685 x-corner coordinate 1: 350 7685
y-corner coordinate 1: 597 4637 y-corner coordinate 1: 597 4637
x-corner coordinate 2: 350 7695 x-corner coordinate 2: 350 7690
y-corner coordinate 2: 597 4639 y-corner coordinate 2: 597 4638
Height: 3 m x-corner coordinate 3: 350 7692
Orientation: South y-corner coordinate 3: 597 4632
x-corner coordinate 4: 350 7687
y-corner coordinate 4: 597 4630
________________________________________________________________________
Example of a WTG
Hub height:
Rotor radius:
Height above sea level:
100 m
35 m
48 m
x-corner coordinate: 350 7745
y-corner coordinate: 597 4229
___________________________________________________________________
Appendix B: Example of a Log Sequence
1 04.02.2003 14.40.23 2 1 0 min 34 min theoretical shadow impact
2 04.02.2003 14.45.29 2 1 0 min 34 min shadow impact
3 04.02.2003 14.48.20 2 1 3 min 37 min theoretical shadow impact
4 04.02.2003 14.50.54 2 1 3 min 37 min shadow impact
5 04.02.2003 15.17.57 2 1 30 min 64 min Stop WTG
7 04.02.2003 15.27.30 2 1 30 min 64 min end of shadow impact
8 04.02.2003 15.28.44 2 1 30 min 64 min Start WTG
9 04.02.2003 16.15.54 5 2 0 min 325 min shadow impact
10 04.02.2003 16.22.32 5 2 6 min 331 min end of shadow impact
Explanation:
PI:
WTG:
Stop WTG:
Start WTG:
theoretical shadow impact:
shadow impact:
Place of Immission (building)
Wind Turbine Generator
the corresponding WTG was shut down by the shadow impact module
the corresponding WTG was released
the corresponding WTG causes theoretical shadow impact in the
corresponding PI but the direct sun radiation is not strong enough to cause
real shadow impact
shadow impact actually occurs in the corresponding place of immission;
the direct sun radiation is strong enough to cause real shadow impact
Changes and errors excepted; Version 2003-09
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Shadow Impact Module Specifications
Operating temperature: -20°C … 50°C
Protection class: IP 65
Switch Cabinet with Module
Dimensions: 500 x 500 x 310 mm (H x W x D)
Weight:
approx. 23 kg
Supply voltage:
230 V AC
Max. power consumption: 30 W
Switch outputs:
floating relay contacts (normally closed contact/ normally open contact),
12 max.
Max. switching voltage: 60 V/AC, 125 V/DC
Max. switching capacity: 62,5 VA / 30 W
Radiation Sensor
Dimensions: 80 x 65 x80 mm (H x W x D)
Weight:
approx. 11 kg (cantilever incl.)
Cantilever length: 1,5 m
Supply voltage:
15 V DC (power supply installed inside the cabinet)
Radio controlled Clock
Dimensions: 90 x 90 x50 mm (H x W x D)
Weight:
approx. 800g
Supply voltage:
15 V DC (power supply installed inside the cabinet)
Development and Sales
WINDTEST Kaiser-Wilhelm-Koog GmbH
Sommerdeich 14 b
D-25709 Kaiser-Wilhelm-Koog
Tel: + 49 (0)4856 901 - 0
Fax: + 49 (0)4856 901 - 99
swm@windtest.de
Support, Installation, Maintenance
and Location Survey
NorthTec GmbH
Horsbeker Weg 2
D-24980 Schafflund
Tel: + 49 (0)4639 782 046
Fax: + 49 (0)4639 782 3030
swm@northtec.org
Changes and errors excepted; Version 2003-09
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