Direct Drive Wind Turbines
High Yield
500kW Direct Drive Wind Turbine
www.ewtdirectwind.com
The DIRECTWIND 52/54-500kW was developed in response to market demand and designed according to EWT’s proven Direct Drive technology.
This turbine is specifically designed for operating in low/moderate wind speed areas. Streamlined production and cost efficiency make EWT
turnkey project solutions highly attractive, delivering an excellent energy yield which ensures an optimal return on investment.
Power (kW)
Specifications
Rotor diameter
IEC Wind Class Rotor speed
Nominal power output
Hub heights
52 or 54m
IIA & IIIA
Variable, 12 - 26 rpm
500 kW
35, 40, 50 and 75 m
Cut-in wind speed
Rated wind speed
Cut-out wind speed
Survival wind speed
2.5 m/s
10 m/s
25 m/s, 10 min. avg.
59.5 m/s
Power output control
Generator
Power converter
Pitch controlled variable speed
Synchronous multi-pole wound-rotor
IGBT-controlled
Windspeed (m/s)
www.ewtdirectwind.com
Cp (-)
Yield (MWh/y)
Annual mean windspeed (m/s)
Direct Drive Wind Turbines
Direct Drive Wind Technology
In EWT turbines the rotor directly drives the synchronous generator, without the use of a gearbox.
This is important because various studies have concluded that the dominant cause of downtime is
malfunctioning of gearboxes. The generated energy is fed into the grid via a modern back-to-back
full-power converter which controls the output, so grid requirements can be met. This makes the
DIRECTWIND turbine suitable to operate in weak grids.
Advantages of EWT’s Direct Drive Technology:
• Superior availability levels
• Low maintenance costs
• No need to replace gearboxes
• Reduced noise levels
• High yields / return on investment
• Low cost of ownership
Power quality & Site conditions
The DIRECTWIND turbine feeds generator power into the grid by means of a modern ‘back-to-back’
type full-converter system. This converter contains a number of programmable functions like a
capability to control the reactive power output. Built-in grid-fault-ride-through technology is
available on demand.
All the advanced grid-connection features combined make the DIRECTWIND the perfect choice for
solitary applications, weak grids and demanding locations with constrains in site access.
The combination of advanced control features and proven wind technology makes the DIRECTWIND
also a first-class choice with regard to energy yield. Fewer components, high reliability, reduced
maintenance and excellent energy yield ensure an optimal return on investment. We are looking
forward to showing you what our DIRECTWIND systems can offer.
DSP - DIRECTWIND Service Program
EWT stands for high-quality direct drive turbines characterized by reliability and cost efficiency.
To ensure optimal performance and trouble-free operation of our DIRECTWIND turbines, we have
a extensive service and maintenance program in place. The DIRECTWIND Service Program offers:
• Preventive maintenance
• Corrective maintenance
• Availability guarantee
• Power curve guarantee
EWT B.V.
• Business Interruption compensation
Lindeboomseweg 51
3825 AL Amersfoort
The Netherlands
T +31 (0)33 454 05 20
F +31 (0)33 456 30 92
sales@ewtdirectwind.com
www.ewtdirecwind.com
• Extended product warranty
The company
EWT is a designer and manufacturer of direct drive wind turbines active in Europe, North America
and Asia. EWT was established in 2004 and is based in the Netherlands. The company has an
extensive product line, an engineering department covering all relevant disciplines and a dedicated
service and maintenance organisation.
Disclaimer: The information included herein is provided to you for general information purposes only. Although every effort has been made to ensure the accuracy of such information, EWT makes no
representation or warranty of any kind, express or implied, as to the correctness, accuracy, reliability or completeness of the information.
www.ewtdirectwind.com
Copyright EWT 2013 ©
Direct Drive Wind Turbines
Proven robust
900kW Direct Drive Wind Turbine
The DIRECTWIND 52/54 – 900kW is a pitch controlled variable speed wind turbine that combines continuous market driven innovation with
highly advanced direct drive technology. The DIRECTWIND 52/54 – 900kW turbine boasts a track record over 400 operating turbines in many
different wind climates.
Power (kW)
Specifications
Rotor diameter
IEC Wind Class Rotor speed
Nominal power output
Hub heights
52 or 54m
IIA & IIIA
Variable, 12 - 28 rpm
900 kW
35, 40, 50 and 75 m
Cut-in wind speed
Rated wind speed
Cut-out wind speed
Survival wind speed
2.5 m/s
13.5 m/s
25 m/s, 10 min. avg.
59.5 m/s
Power output control
Generator
Power converter
Pitch controlled variable speed
Synchronous multi-pole wound-rotor
IGBT-controlled
Windspeed (m/s)
www.ewtdirectwind.com
Cp (-)
Yield (MWh/y)
Annual mean windspeed (m/s)
Direct Drive Wind Turbines
Direct Drive Wind Technology
In EWT turbines the rotor directly drives the synchronous generator, without the use of a gearbox.
This is important because various studies have concluded that the dominant cause of downtime is
malfunctioning of gearboxes. The generated energy is fed into the grid via a modern back-to-back
full-power converter which controls the output, so grid requirements can be met. This makes the
DIRECTWIND turbine suitable to operate in weak grids.
Advantages of EWT’s Direct Drive Technology:
• Superior availability levels
• Low maintenance costs
• No need to replace gearboxes
• Reduced noise levels
• High yields / return on investment
• Low cost of ownership
Power quality & Site conditions
The DIRECTWIND turbine feeds generator power into the grid by means of a modern ‘back-to-back’
type full-converter system. This converter contains a number of programmable functions like a
capability to control the reactive power output. Built-in grid-fault-ride-through technology is
available on demand.
All the advanced grid-connection features combined make the DIRECTWIND the perfect choice for
solitary applications, weak grids and demanding locations with constrains in site access.
The combination of advanced control features and proven wind technology makes the DIRECTWIND
also a first-class choice with regard to energy yield. Fewer components, high reliability, reduced
maintenance and excellent energy yield ensure an optimal return on investment. We are looking
forward to showing you what our DIRECTWIND systems can offer.
DSP - DIRECTWIND Service Program
EWT stands for high-quality direct drive turbines characterized by reliability and cost efficiency.
To ensure optimal performance and trouble-free operation of our DIRECTWIND turbines, we have
a extensive service and maintenance program in place. The DIRECTWIND Service Program offers:
• Preventive maintenance
• Corrective maintenance
• Availability guarantee
• Power curve guarantee
• Extended product warranty
• Business Interruption compensation
The company
EWT is a designer and manufacturer of direct drive wind turbines active in Europe, North America
and Asia. EWT was established in 2004 and is based in the Netherlands. The company has an
extensive product line, an engineering department covering all relevant disciplines and a dedicated
service and maintenance organisation.
EWT B.V.
Lindeboomseweg 51
3825 AL Amersfoort
The Netherlands
T +31 (0)33 454 05 20
F +31 (0)33 456 30 92
sales@ewtdirectwind.com
www.ewtdirecwind.com
Disclaimer: The information included herein is provided to you for general information purposes only. Although every effort has been made to ensure the accuracy of such information, EWT makes no
representation or warranty of any kind, express or implied, as to the correctness, accuracy, reliability or completeness of the information.
www.ewtdirectwind.com
Copyright EWT 2013 ©
PowerWind 500
The PowerWind 500 is perfectly tailored to the requirements
of smaller community wind installations. It combines a
superb profitability due to outstanding energy yield with
a low sound power level. Moreover its aesthetic design
and reduced heights make the PowerWind 500 perfect to
integrate in community surroundings.
The PowerWind 500 is a variable-speed, pitch-controlled
wind turbine, certified in accordance with IEC wind class
IIA. It has a rated power output of 500 kW and a rotor
diameter of 56 m. The turbine design is based on the wellproven modular drive train concept and combines robust
mechanical engineering with state-of-the-art power
electronics. Many years of wind energy experience and the
success of the 900 kW PowerWind 56 have been drawn on in
the creation of this new model.
Designed to simplify logistics, the PowerWind 500 is
particularly benefical for locations which are difficult to
access or have weak infrastructure.
PowerWind 500
The PowerWind 500 has a superb profitability due the
highest energy yield in its class.
·· Higher energy yield than all other comparable wind turbines
in the same class due to large rotor diameter
·· Variable speed and pitch control allow maximum energy
production at reduced drive train loads
·· Mulitple tower sizes from 44-50 m
Low sound power level due to reduced rotor speed.
·· Sophisticated turbine design concept allows lower rotational
speed and therefore a very low sound power level
The PowerWind 500 is modelled after the proven modular
drive train concept — sharing the same mechanical
robustness as the established PowerWind 56.
·· The newly developed PowerWind 500 is designed with a
maximum rated power of 500 kW
·· High reliability due to sophisticated components from
reputable European manufacturers
·· Robust engineering
By using a full-scale converter in the megawatt class, the
PowerWind 500 benefits from the experience gained with
multi-megawatt turbines.
·· Minimal disturbances (harmonics and flicker) due to use of a
full-scale converter
·· Large reactive power control range for potential of grid
support
·· Fault ride through in accordance with international grid
requirement (optional)
By consciously reducing the system dimensions, difficult
logistics requirements are met.
·· Transport in containers possible
·· Transport of the three rotor blades on a single truck
·· Lesser crane requirement than multi-megawatt turbines,
therefore significantly higher crane availability
·· No special permit for road transport required in many
countries
PowerWind 500
With its full range of features, the PowerWind 500 perfectly
matches the requirements of smaller community wind
installations.
·· Highest energy yield due to large rotor diameter
·· Low sound power level due to reduced rotor speed
·· Compact design facilitates logistics and installation even in
difficult locations
·· Full-scale converter makes the system suitable even for weak
grids
All key components are sourced from reputable European
manufacturers and meet high durability standards.
·· Close cooperation with leading companies in the wind
industry
·· Core suppliers certified to ISO 9001: 2008
PI PW500 DataSheet en 03
The modern control concept offers web-based system
monitoring and control.
·· Simple web-based remote monitoring (SCADA) independent
of a specific site
Performance
Rated power output Cut-in wind speed Rated wind speed
Cut-out wind speed
Rotor diameter Rotor swept area Rotor speed Speed control Aerodynamic breaking Operating temperature range Power factor
Wind class
Gearbox Gear ratio Mechanical brake Yaw drive
Yaw brake
500 kW
3 m/s
10 m/s
25 m/s
56 m
2,463 m²
6-24,9 rpm
Individual electrical pitch
Individual full span pitch
-20 °C to +45 °C
0.9 ind. to 0.9 cap.
IEC 61400 IIA
One planetary and two spur gears
1:54.2
Disc brake on high-speed shaft
(hydraulic)
3 AC motor drives with planetary gear
Friction brake
The high importance given to environmental protection is
clearly reflected in our design.
·· Where possible, no hydraulic units are used
·· Enclosed oil and grease collecting trays
·· Use of a readily biodegradable, non-water hazardous
transformer fluid (Midel)
Compliance with all applicable safety standards is
guaranteed.
·· Lightning and surge protection corresponds to the lightning
protection zone concept of IEC 61400-24
·· Design of the tower fixtures is in accordance with DIN EN
25817-B and EN 50308
The PowerWind 500 was developed to provide easy service
and maintenance.
·· Accessibility to all main components with the possibility of
easy replacement
·· Customized service packages available
Generator Asynchronous, air-cooled
Nominal rotation 1,350 rpm
Enclosure class IP 55
Converter Full-scale converter (water-cooled)
Tower Conical steel tower
Hub height 44, 46, 49, 50 m
Nacelle Glass fibre reinforced plastic
Blades
Glass fibre reinforced plastic
Blade length 27.1 m
Number of blades 3
Control system PowerWind
SCADA PowerWind SCADA System
Grid connection
50 Hz/690 V
Available from:
PowerWind GmbH
Kehrwieder 8
20457 Hamburg
Germany
info@powerwind.de
For further information: www.powerwind.de
Subject to technical modifications.
© 2011 PowerWind