The N149/4.0-4.5 turbine is our highest yielding onshore turbine for light and medium wind regions. The turbine has a 30 percent increase in rotor sweep and a variable power output of 4.0 to 4.5 MW. As the maximum output of the turbine varies between 4.0 and 4.5 MW, it is ideal for adapting to the grid operator's individual requirements, local wind conditions and noise restraints. This also means that it’s possible to optimise the overall yield of a wind farm by means of the different maximum output of individual turbines, thus always exploiting the full potential of each turbine position within each single wind farm. This is an advantage, among other things, with large-scale projects that often come with different wind conditions and complex topography. The N149/4.0-4.5 ensures that the highest possible energy yield is obtained: up to 28 percent more compared to the N131/3600 turbine.
Yet, despite this substantial increase in output, the maximum sound power level of the N149/4.0-4.5 lies between 103.6 dB(A) and 106.1 dB(A). In addition to this, at sites with lower permissible sound power requirements, the turbine can operate in a large number of sound-optimising modes. At 3 MW nominal power the sound power level lies at max. 96.6 dB(A).
The initiall available towers offer hub heights of 105, 125 and 164 metres.
The N149/4.0-4.5 is the latest development stage of its successful Delta platform: the Delta4000 series. Nordex customers are able to benefit the gain from more than 17 years of experience in the multi-megawatt segment.
Greater nominal output
The N149/4.0-4.5 has a variable maximum output between 4.0 and 4.5 MW. Compared to the N131/3600 the turbine’s energy yield is up to 28 percent more. This makes it our highest yielding onshore turbine for light-, to medium wind regions.
Proven rotor blade design - increased rotor surface
The N149/4.0-4.5 features the in-house developed one piece NR74.5 rotor blade. Compared to the N131 the rotor diameter is 18 metres larger, the rotor sweep is 17,460 square meters. Nordex has kept the same one piece rotor blade structure while optimising the design for transport and production. For instance, the main girders of the rotor blade are made of carbon fibre, which was introduced for the first time in 2010 for the N117/2400 and is also being used for the N131 turbine since 2014. The rotor blade structure was developed, in part, by knowledge and expertise provided by SSP, a Danish manufacturer which specialises in longer rotor blades and was taken over by the Nordex Group spring 2017.
Optimized hub heights
Hub heights of 105, 125 and 164 meters for light and medium wind sites 3 help to achieve greater yields.
Reduced power levels
Despite the substantial increase in output, the maximum sound power level of the N149/4.0-4.5 lies between 103.6 dB(A) and 106.1 dB(A), proudly making it currently the quietest turbine in the 4.0-4.5 MW class for light wind sites. At sites with lower permissible sound power requirements, the turbine can operate in a large number of sound-optimised modes. These can be individually controlled on the basis of wind direction, time of day, outside temperature or local public holidays in order to keep the acoustic load as low as possible and meet legislative requirements.
The turbine is designed for an operational lifetime of 20 years while, depending on local site conditions of the wind farm, an operating life of up to 25 years can also be attested to.
Reduced service effort
The technical concept of the N149/4.0-4.5 minimises the service effort over the whole lifetime: every component was consequently designed for reduced maintenance. Further the turbine has been designed to cater for a mobile crane solution in order to exchange main components with reduced cost and effort.
Proven drive train concept
The drive train concept is based on the proven 3-point bearing structure. The optimised drive train geometry reduces the forces impacting the individual components, thus lowering the strain on the robust rotor bearings.
Transformer and converter are integrated in the nacelle in order to achieve higher yields, due to reduced cable losses The nacelle has the same exterior dimensions of the Delta nacelle for trouble-free transport.
Economical electrical system
As with the first wind power systems using Nordex’s multi-megawatt platform introduced in the year 2000, the N149/4.0-4.5 is fitted with a double-fed asynchronous generator and frequency converter. This system is characterised by superior reliability and economic efficiency.
Internally produced control system
Over 4,500 Nordex turbines have already been fitted with Nordex’s own proven Nordex Control™ system, which controls, regulates and monitors the wind power systems. Permanent and protected access to the turbine and wind farm data on site or remotely is browser-based, interactive and secure. With its modular structure and standardised interfaces, Nordex Control™ can be adjusted flexibly to meet the customer’s SCADA requirements.
Accustomed grid compatibility
The N149/4.0-4.5 meets the grid requirements of the international markets. The German System Service Ordinance (SDLWindV) is one of the most demanding grid codes in Europe. With their fault ride-through capabilities, the turbines can effortlessly bridge any disruptions in voltage and thus fully comply with all requirements for the system service bonus. What is more, the Nordex Windfarm Management System allows the grid operator to directly control the active and reactive power of the windfarm in the grid.
Standard operating conditions
The turbine can be operated at sites with average temperatures in a normal climate range and even at temperatures of as low as -20 degrees Celsius, thus enhancing the annual yield at your site. The proven Nordex Cold Climate Package additionally helps to open up high-yield cold locations. The cold-climate version of the turbine has an extended operating range of temperatures down to -30 degrees Celsius.
The Anti-Icing System heats the aerodynamically most important surfaces of the rotor blades, thus reducing ice formation efficiently, resulting in considerable yield gains at sites characterised by frequent ice formation.
A safe work place
The turbine nacelle is a spacious workplace with deliberate escape and rescue routes. This helps to lower maintenance-induced downtimes:
- Readily accessible systems for maintenance
- On-board crane for replacing components <=1 ton
- Swift and weather-protected access to the hub thanks to complete encapsulation