Blade-angle optimization for harnessing wind power
Housed in the hub that supports the blades, the pitch system is a combination of components that monitor and manipulate blade angles to control rotation speed, as well as the area exposed to the wind.
Pitch control is an important element of the overall wind turbine system that improves turbine efficiency by optimizing wind utilization. Pitch systems also stabilize rotational speed for uniform power generation and synchronization with the power grid. They protect the system by preventing turbine overspeed and reducing forces on the rotor during system idle or servicing.
Understanding blade positioning systems
A thorough understanding of pitch control hardware and mechanisms is essential for wind power technicians. The Hydraulic Pitch Hub – Wind Turbine Learning System provides hands-on training in real-world operation, maintenance, and troubleshooting situations.
The fully-operational system features all the components typically found in the hub of a commercial wind turbine, as well as a representation of the wind turbine blade. It addresses blade pitch control and emergency back-up systems using the technologies typical to hydraulic pitch control systems.
The learning system is mounted on a mobile, compact frame and integrates components commonly used in industry for realistic training. The electrical enclosure, located near the HMI, houses a programmable logic controller (PLC), contactors, breakers, and an uninterruptible power supply (UPS).
Interactive wind simulations
The system is controlled and monitored using a Siemens PLC for motion control, located inside the electrical enclosure; a HMI touch screen allows communication with the PLC.
The main screen shows blade angle and rotor speed. The wind and the yaw system are simulated. With the touch screen, students can easily create wind simulations, entering values for duration, direction, and speed. In the automatic mode, the PLC determines blade angles. The manual mode allows students to perform certain actions on the blade (change angles, stop, jog, etc.) to observe the effects on the pitch system. The HMI also allows instructors to insert faults to improve troubleshooting skills.
Control through a hydraulic closed-loop positioning system
The movement of the blade, which is mounted on a slewing bearing, is controlled by a hydraulic closed-loop positioning system, composed of a solenoid-operated proportional valve for flow control, and a hydraulic cylinder equipped with a position sensor. The cylinder is attached to the slew bearing to translate the blade pitch to the requested angle.
- Fully-operational, single-blade positioning systems
- Blade movement actuated by a hydraulic cylinder
- Industrial components: electrical panel with servo motion controller, programmable logic controller (PLC), contactors, breakers, and uninterruptible power supply (UPS)
- Human-Machine Interface (HMI) to control the system and set faults
- Emergency pushbutton and protective guard for safe operation
- Can be connected to the Nacelle Wind Power Learning System
- Turnkey courseware
- Introduction to energy production with wind power
- Machine safety
- Introduction to SCADA
- Hydraulic systems and pitch control operation
- Electrical system
- Back-up power
Training course documents
Hydraulic Pitch Hub – Wind Turbine Learning System Training Course Documents
The training course documents (a student manual and an instructor guide) present all the required theoretical concepts, providing complete coverage of the fundamentals of wind turbine operation, reinforced by illustrated, detailed exercises.