At present, the wind power hydraulic system provided by major companies in the world widely uses a proportional servo closed-loop control system. AAAA USA Parker supplies a wide range of hydraulic components and complete wind power systems (including control systems for brakes, deflectors and blade angles) for wind power generation. The angle control system consists of a specially designed hydraulic cylinder, which is installed in the wheel hub of the wind wheel. The hydraulic cylinder is equipped with a position sensor. The cylinder also integrates the required hydraulic valves. Each wind power equipment has two or three sets of independent angle control. System (one for each blade). The system has the advantages of high reliability and safety, good dynamic and static performance, convenient maintenance and less leakage. The system uses high-performance proportional servo control that can be controlled by analog or digital signals. Parke's valve assemblies are pre-tested to reduce installation and commissioning time, reduce costs, and save on operating and maintenance costs. The hydraulic source is supplied by a separate hydraulic station with good filtration performance. The deflector slewing system has a good ability to keep the blades correctly aligned with the wind direction, so that wind power has good performance. Parker offers both electronic and hydraulic control systems. The hydraulic system provides a more compact direct drive. It also has good overload protection and avoids component damage. The system uses closed-loop proportional servo control with good dynamic and static performance. Parker is equipped with the above three systems, and also provides independent filter power and hydraulic power source provided by the accumulator in case of power failure, ensuring safe stop and unit safety.
Eaton Company has done a lot of research work on wind power hydraulic control system. The closed-loop proportional control system of wind turbine blade angle can withstand high temperature and low temperature working conditions, and the system has good dynamic and static performance and high positional accuracy. .
Bosch Rexroth is a supplier of wind power hydraulic systems and electrical systems in Europe. It can provide complete sets of gearboxes, brake systems, rotor blade control systems and deflector control systems for the unit. An electrical control system and a hydraulic proportional servo closed loop system are available upon request. Hydraulic drive systems have been widely used in large wind turbines.
