[How to improve wind turbine output in all climates] [NM54/950 ...

[ How to improve
wind turbine output
in all climates]
[ NM54/950 Power-Trim TM ]

[ Regardless of climate...
NEG Micon has created the intelligent
Passive Stall wind turbine,
one that always renders optimum
performance, as the turbine itself
ensures optimal pitching of the
blades irrespective of climate conditions
– from arctic cold to the dry
heat of the desert.
NEG Micon has created the
Power-Trim TM technology – and
we have integrated it into one of
the market’s most reliable and
widely used wind turbines.
...total control]
Power-Trim TM
The computer-based control system
of Power-Trim gathers and processes
information on wind speeds, air density
(temperature/pressure) and blade
alignment. The information is correlated
with the calculated power
production at a given stall level and
should the actual power production
be less than the calculated power
production, the system changes the
pitch angle. This is achieved with the
help of the newly developed Power-
Trim hub.
Through the use of three hydraulic
actuators the new hub allows the
Power-Trim turbine to alter the angle
of the blades by typically +/- 4
degrees, thus always maintaining
optimum stall levels despite variations
in air density and contamination
of the blades caused by frost, dirt or
insects.

[ The solution]
New rotor technology on proven
wind turbine
The NM54/950 wind turbine is based
on NEG Micon’s well-known family of
products, the NM48/600, NM48/750
and NM52/900. More than 2,500
wind turbines of this model have
been installed worldwide, a constant
testimony to their sound and reliable
technology, allowing high performance
with a minimum of maintenance
– a particularly sound investment,
which will now be even more
profitable.
8°
Power-Trim TM
8°
8°

Composite box
Bulkhead
Bulkhead
Power curve
kW
Carbon fibre shaft
Damper
1000
900
800
700
600
500
400
300
200
100
0 0 5 10 15 20 25
Metre/sec
Technical data
Operational parameters:
Nominal output 950 kW
Power regulation Stall
Cut-in 3.5 m/s
Cut-out 25 m/s
Rotor
Rotor diameter 54.5 m
Rotor swept area 2333 m2
Number of blades 3
Rotor revolutions 22/15 rpm
Rotor placing Upwind rotor
The control of Power-Trim TM is based on:
1. The controller works to ensure that the blade pitch
is adjusted to the optimal position for the current
conditions
2. Measurements of wind speed and temperature are
used to determine the power level of the wind
turbine
3. The actual power achieved is compared to that
expected
4. The blade pitch is adjusted to give the expected
power level thereby correcting for both air density
variation and any blade contamination
5. The 950 kW rated power is attained regardless of
air density and contamination
6. The blade pitch position is typically reviewed every
30 minutes
7. High power correction: immediate blade pitching
action is taken in order to avoid high power levels
8. In case of any malfunction in the pitch system the
turbine continues operating as a passive stall regulated
turbine and the blade pitch is held in its
current position
9. Any loss of power or control causes a fail-safe
shutdown of the turbine using the tip brakes. The
Power-Trim system has no active role during safety
system shutdown
Brake system
Blade tip air brake Hydraulic, fail-safe
Disc brake 1 pcs. hydraulic, fail-safe
Drive train
Gear type Planetary – parallel axle
Ratio 1:67.5 (1:81.0 - 60 Hz)
Main shaft Forged shaft and flange
Main bearing Spherical roller bearing
Cooling Heat exchanger with pump
Generator
Type Asynchronous, 4-6 pole
Nominal voltage 690 V (600 V - USA)
Nominal frequence 50 Hz (60 Hz - USA)
Name plate rating 950/200 kW
Cooling Liquid-cooled with pump
Yaw system
Type Sliding bearing
Drive mechanism 3 electrical planetary gears
Tower
Type Conical, steel, painted
Hub height According to type approvals
Controller
Type Computer controlling
Cut-in system Soft with thyristors
Phase compensation Generator no load
compensation
Remote control By modem
Sensors
RPM sensors Rotor, generator, yaw system
Temperature sensors Gear, generator, controller,
ambient
Vibration sensors Nacelle, rotor
Meteorology Anemometer, wind vanes
Hydraulic systems Pressure transducers
Lightning protection
According to standard IEC1024 class 1
Blades Receptor in the blade tips
Nacelle Air rod
Please note that the power curve has been noted at standard atmospheric density according to DIN ISO 2533. Please note that the rotor and the hub heights
have been approved for specific markets and wind classes - please call for further information. NEG Micon A/S reserves the right to change specifications and
to use components of alternative manufacture without prior notice. Alternative components will be of the same high quality and standard as in this survey.
Power-Trim TM is a NEG Micon registered trademark.

[We imitate the birds...]

NEG Micon’s mission is to develop
wind energy systems that are fully
competitive with conventional methods
of energy production. We are
seeking to become the preferred partner
when it comes to professional
investment in reliable and efficient
wind energy production. We strive to
convert any collaboration with our
customers into a close partnership,
with the purpose of increasing the
return on wind turbine projects
through the interchange of ideas and
forward-looking technological development.
Together we will create a
”powerful future”.
NEG Micon A/S
Alsvej 21
DK-8900 Randers
Tel: +45 8710 5000
Fax:+45 8710 5001
E-mail: mail@neg-micon.dk
www.neg-micon.com
Jørn Moesgård as