Abstract
The technology in wind turbines has developed very rapidly but there are still a lot that can be improved also regarding new technologies. One example is wind turbine with hydraulic transmission. At the beginning low power wind turbines are in view. First of all the wind energy is meant to be used by isolated users for household and garden equipment or pumping water. Later, if results will be as expected, and wind potential satisfactory, such systems could be connected to electric grid. In our research laboratory we must build an experimental setup. The simulation for wind turbine and fixed displacement pump coupled to it will be realized using a variable displacement piston pump. As the variable wind speed has as a result variations of the pump flow, the variable displacement pump from the test rig may reproduce a similar variation law. In this paper some aspects regarding the variable displacement pump are detailed. This study is necessary for the future development of the research.
Highlights
The technology in wind turbines has developed rapidly there are still a lot that can be improved and new technologies emerge frequently
The pump outlet flow: Q1 p where: Vp is displacement of hydraulic pump [m3·rot-1], ωp is rotational speed at pump axle [rad·s-1], p1 is pressure at pump outlet [N·m-2], p2 is pressure at pump inlet [N·m-2], Rp is output resistance for the pump [N·m-2/m3·s-1], Ri is internal resistance [N·m-2/m3·s-1]
The motor inlet flow: Q1m where: Vm is displacement of hydraulic motor [m3·rot-1], ωm is rotational speed at motor axle [rad·s-1], p1 is pressure at motor outlet [N·m-2], p2 is pressure at motor inlet [N·m-2], Rm is output resistance for the motor [N·m-2/m3·s-1], Ri is internal resistance [N·m-2/m3·s-1]
Summary
The technology in wind turbines has developed rapidly there are still a lot that can be improved and new technologies emerge frequently. Laboratory experiments were successfully carried out at scales of 600W (validation of control method with water hydraulics & rotor in wind tunnel) and 10kW (coupled oil and water circuits) Another set of experiments was carried out using the 1MW test rig (oil) at the Institute for Fluid Power Drives and Controls (IFAS) at RWTH Aachen University [1, 2]. It is important that if possible to configure the fluid power transmission system in such a way that no form of active control is required for the hydraulic transmission. Considering the future development of wind turbines with hydraulic transmissions one must try to answer some justified questions: - Will a hydrostatic transmission be able to control the speed of the generator, so that the generated electricity satisfies the electric grid standards during normal operational conditions, without the use of a power converter? As the variable wind speed has as a result variations of the pump flow, the variable displacement pump from the test rig may reproduce a similar variation law [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
