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Hitachi

Wind Turbine

Nacelle and Hub
Nacelle and Hub

Hub

The hub consists of the hub housing and a pitch system.

  1. Construction
    The blade mount of the hub housing is reinforced to enhance structural strength, thereby making the equipment lighter in terms of total weight.
  2. Pitch system
    The pitch control mechanism is electrically driven to ensure controllability, maintainability, environmental compatibility and other positive characteristics. The system also features three-axis independent control.

Drive train

Nacelle as divided into three
Nacelle as divided into three

  1. Main shaft
    The drive train is based on a single bearing and a short main shaft, resulting in lighter weight.
  2. Gearbox
    The gearbox is conventionally structured based on a one stage planetary gear and a two stage helical gear. It also incorporates a bearing designed specifically to bear thrust loads in order to ensure reliability.
  3. Transport and assembly of the drive train
    The main shaft including main shaft bearing and the gearbox come separate as drive train components.
    This reduces the total weight of the drive train and the nacelle base to less than 40 tons, making it easier to transport.

Wind sensor

The equipment comes equipped with a vane and an anemometer, both of which can withstand wind velocities in excess of 70 m/s. Both are also protected against ice and snow.

Service crane

The equipment comes equipped with a service crane with a suspension capacity of 200 kg.

Turbine control system

  1. Power control
    The main control unit (wind turbine control panel) is connected to each subsystem and digital data bus. Information from the various sensors and subsystems is used to control each subsystem in order to maintain the equipment in optimal generating condition.

    Control Unit
    Control Unit

  2. Safety system
    The pitch mechanism and several brake systems are used in consideration of all kinds of fail-safe devices, thereby ensuring safety. Particular attention is paid to the main brake (blade feather); each of its three shafts is equipped with an emergency battery to provide a triple fail-safe system.
  3. Vibration reduction
    Fast full digital control reduces changes in drive train load. At the same time, changes in output are inhibited.
  4. Operation system
    The operation panel on the main control unit employs a user-friendly, large-screen, color liquid crystal touch panel.