• Offer Profile
  • Mervento was born in Finland’s west coast to meet the very challenges of wind-beaten, almost arctic lowlands. We are part of Scandinavia’s largest export-oriented energy technology cluster comprising a total of 120 companies, better known as EnergyVaasa. The vast horizons around our home city of Vaasa consist of at lowlands and a long rustic coastal strip along the Gulf of Bothnia. Here the dark Nordic winter lasts long, the temperatures are way down in the sub-zero region and the winds can be unforgiving. The nightless nights of the short summer are captivating, yet the new winter is always just around the corner. A perfect place to be? Yes, for an inventive technology company and a provider of wind turbine power plant solutions for nearshore and offshore applications. If our solid wind turbine makes it here, it will make it anywhere. On our rustic shores we know that nothing less than highly reliable designs, state of the art engineering and high-quality delivery will survive.
Product Portfolio
  • MERVENTO 3.6-118

  • Elevates your wind power revenue
    The MERVENTO 3.6-118 wind turbine redefines the wind industry expectation for lifecycle profitability. Superior energy yield combined with minimized O&M cost generates the lowest cost of energy. Pure and simple.

    MERVENTO 3.6-118 with a 125 meter full steel tower supported with stay cables as standard. The freestanding tower option is 90 meters. The stay cable tower design results in a very high natural frequency of the complete turbine and ensures resonance-free operation. The stay cables take the thrust loads, so there is no bending moment at the tower root, which also enables a relatively small foundation. The decommissioning costs are low due to the bolted tower segments. The tower and stay cables are fully recyclable giving a payback when recycled.
      • Technology

      • Mervento has successfully simplified the traditional wind turbine design with many new innovative solutions. We developed a medium voltage direct drive permanent magnet generator to transform mechanical energy to electric power. The wind is optimally harnessed by Mervento’s advanced 3D cyclic pitch-controlled, variable-speed rotor. The key advantages of our direct drive layout are both technical and economical. In short, the turbine produces more with less efforts leading to very reasonable life cycle costs. Another way of arriving at the same conclusion is to call it a smart investment. The return on investment is high as the total cost of ownership is very competitive by any comparison: all robust Mervento units are a sum total of reasonable investment costs, unbeatably low maintenance costs, competitive operation costs and healthy level of revenues. Even though Mervento wind turbine looks almost the same as wind turbines always, great deal of details have been rethought inside out resulting a wind turbine design with some 20 new wind power innovations. Yet never seen in wind turbines before, the innovations are well proven in other fields of industry.
      • MERVENTO 3.6-118

      • MERVENTO 3.6-118 is the next generation gearless direct driven wind turbine for wind class IEC IIA. It is designed for demanding climate conditions including hot, cold, salty, dusty or polluted air – both onshore and offshore. Applicability in turbulent conditions and locations where the wind speed gradient is exceptionally high has been special design objective. The 118 m rotor diameter with low rated wind speed in combination with high efficiency rotor blades gives superior output. The rotor blade is specifically designed for the MERVENTO 3.6-118 direct drive turbine, giving an optimized power coefficient over the whole wind speed range. All components in the power train are highly efficient. The direct drive medium voltage permanent magnet generator ensures a wider operating range and reduced power losses. All own use drives are equipped with frequency converters in order to cut back internal energy consumption. MERVENTO 3.6-118 is available with 125 m stay-cable supported tower or with 90 m free standing tower alternative.

    • Many smart details together create a great solution. Here are some that make the MERVENTO 3.6-118 just that.
        • THE ROTOR

        • The rotor blades are especially designed for the MERVENTO 3.6-118 turbine. They help to optimize the power coefficient over the whole wind speed range. Innovative blade design and cyclic pitch result in a very silent rotor operation.

          The wind turbine starts when the wind reaches a speed of 4 m/s. Rated power is reached at a wind speed as low as 11.5 m/s. If the average wind speed exceeds the maximum operational limit of 25 m/s, the turbine shuts down by feathering of the rotor blades.

        • The pitch system is based on three complementary systems; feathering, collective pitch and cyclic pitch. The novel cyclic pitch system alters the pitch angle of the rotor blades cyclically according to wind shear. It operates constantly over the rotor revolution. The cyclic pitch reduces the rotor blade and turbine loads remarkably above rated wind speed. Furthermore, the cyclic pitch system increases the energy production below rated wind speed. It is a fully mechanical system and does not consume any
          additional energy. In case of loss of electricity, the pitch system is supported by blade-individual hydraulic piston accumulators ensuring safe and controlled shutdown.

        • In addition to the aerodynamic brake, feathering of the rotor blades, the wind turbines are generally equipped with a hydraulic rotor brake. In a direct drive turbine the rotor brake is connected directly to the turbine rotor, hence the rotor disc will have a large
          mass and a very low rotational speed. This is why the temperature increase in the rotor disc during a braking operation is minor with no risk for fire.
          The fully fireproof rotor brake system is tailored for the MERVENTO 3.6-118 turbine and located in the hub.
        • THE YAW SYSTEM

        • The yaw system in MERVENTO 3.6-118 is based on two yaw bearings one upon the other: an upper double row ball bearing for axial, radial loads and bending moments, and a lower roller bearing
          for only radial loads.

          The hydraulic yaw actuators are integrated with the yaw brake mechanism. Together they form a stormproof system that allows controlled yaw slippage in even the most extreme wind gusts that are becoming more and more common
          along with climate change. This climatic phenomenon should be taken into consideration in a modern wind turbine design – as it has been done with the MERVENTO 3.6-118.

        • When the loads on the actuating system increase and conditions get harsh, the benefits of hydraulics are noticeable. The hydraulic components have a very long lifetime and they operate flawlessly in low temperatures and demanding conditions. Hydraulic systems have a larger power density and higher reliability than a complex electromechanical actuating system. Hydraulic systems are failsafe which is an advantage especially considering the pitch and
          brake systems.

          The MERVENTO 3.6-118 is the first turbine with all actuating systems being hydraulic: the pitch, yaw and rotor brake.

        • Mervento integrated the turbine controller, CMS Condition Monitoring System and CBM Condition Based Maintenance into one system. A new, modernized SCADA system that is able to communicate with the grid operator’s system, has also been introduced. These all come as standard in the MERVENTO 3.6-118. The turbine controller is specifically developed for MERVENTO 3.6-118 to take full advantage of the hydraulic actuating systems.

          For example, it constantly measures the rotor blade root bending moment and deploys cyclic pitch adjustment to extract the most aerodynamic power with the least amount of stress to the blades.
          24/7 monitoring, performance reporting and predictive maintenance systems maximize turbine uptime, energy production and availability. The advanced Mervento Control System provides comprehensive real-time performance data and
          predicts upcoming maintenance needs, thus keeping track of your asset throughout its lifetime.
      • The wind turbine reinvented

            • The wind turbine reinvented - MERVENTO 3.6-118

            • Main Specification Tower
              Rated electrical power (1 3.6 MW Hub height 90 m / 125 m
              Cut-in wind speed (2 4 m/s 10 seconds mean Material Steel
              Rated wind speed (2 < 11.5 m/s Electrical Specification (typical values)
              Cut-out wind speed (2 25 m/s 10 seconds mean Generator type

              Direct drive permanent magnet excited synchronous generator

              Wind class IEC IIA Generator voltage 3.9 kV
              Reference wind speed 42.5 m/s 10 minutes mean Power converter Full power 4Q IGCT
              Maximum annual average wind speed (2 8.5 m/s Nominal output voltage 20 / 33 kV
              Turbulence intensity (3 0.16 Nominal frequency 50 / 60 Hz
              Operating temperature range - 30°C ... + 40°C Nominal power voltage range - 10 % ... + 5 %
              ROTOR Power factor range - 0.95 ... + 0.95
              Rotor blade material Glass fibre reinforced epoxy resin Fault Ride Through 4 second at rated power
              Rotor blade length 57 m TURBINE Control
              Diameter 118 m Turbine control MTC Mervento Turbine Controller
              Rotational speed 5.8-12.6 rpm Power control Variable speed, pitch control
              Power coefficient at rated wind sp. 0.40 Pitch control M3DH Mervento 3D Hydraulic
              Power coefficient maximum 0.49 Yaw control MAH Mervento Active Hydraulic
              Mechanical brake Hydraulic, hub mounted low
              speed brake disc
              SCADA and remote control MOI Mervento Operator Interface
              Aerodynamic brake Blade individual hydraulic
              Reporting system MRS Mervento Reporting System
              Cyclic pitch MCP Mervento Cyclic Pitch Condition Based Maintenance MCBM Mervento CBM

              (1 At turbine terminals, sea level, 15°C, rated wind speed
              (2 At hub height
              (3 Charasteristic value of the turbulence intensity, at wind speed 15 m/s, 10 min average