Development of a hydrostatic drive train for onshore and offshore wind turbines

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Test Bench Copyright: © ifas

The main objective of the research project was to develop and test a new type of drive train for wind turbines (WTGs). This drive train is intended to increase the yield of wind turbines and at the same time reduce the cost of the electrical energy produced. Furthermore, the availability of wind turbines can be increased by a novel drive train.
The most important features of the new concept compared to established solutions are a mechanical decoupling of wind turbine and generator as well as the elimination of the usually required frequency converter. This is made possible by hydrostatic power transmission, which allows the transmission ratio of the drive train to be adjusted continuously. This means that the generator speed can be kept constant, so that the electrical energy is generated directly at mains frequency and does not have to be adapted to the mains frequency in a frequency converter. Hydrostatic components also have very good damping, so torque surges caused by the tower shadow effect and wind gusts are smoothed out. In order to maximize the energy yield from the wind, a good overall efficiency is of particular importance, even in partial load operation.
In this project, a hydrostatic wind power transmission was first configured and optimized in simulations. Subsequently, a prototype of the drivetrain was installed and measured on a test rig specially built for this application. The main focus was on the overall efficiency over the entire power spectrum of a wind turbine.
It was shown that the newly developed hydrostatic wind turbine gearbox, using standard components, achieves an efficiency of approx.
standard components, an efficiency of approx. 85 % can be achieved over a wide power range. Furthermore, it can be shown that the efficiency in the partial load range can be further increased by mechanical decoupling.
A demand-oriented interconnection of components increases the efficiency and thus the electricity yield. The measurement results and findings obtained enable an iterative development and optimization loop.

 

Acknowledgement

This research and development project is funded by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) (funding code 0325109A) and supervised by Project Management Jülich.

 

Publications

Title Author(s)
Hydrostatic transmission for wind turbines - lessons learned from five years of research
Contribution to a book, Contribution to a conference proceedings (2017)
Matthiesen, Gunnar (Corresponding author)
Schmitz, Johannes
Vatheuer, Nils
Murrenhoff, Hubertus
Konzipierung und Vermessung hydrostatischer Windkraftgetriebe
Dissertation / PhD Thesis (2015)
Schmitz, Johannes B.
Hydrostatic transmission for wind turbines : comparison of different configurations and their applicability
Contribution to a book, Contribution to a conference proceedings (2014)
Schmitz, Johannes
Murrenhoff, Hubertus
Hydrostatic transmission for wind turbines - an old concept, new dynamics
Contribution to a conference proceedings (2013)
Schmitz, Johannes
Vukovic, Milos
Murrenhoff, Hubertus
Dynamic Transmission Response of a Hydrostatic Transmission measured on a Test Bench
Contribution to a conference proceedings (2012)
Schmitz, Johannes
Diepeveen, Niels
Vatheuer, Nils
Murrenhoff, Hubertus
Dynamic analysis and measurement of hydrostatic transmission for wind turbines
Contribution to a conference proceedings (2012)
Schmitz, Johannes
Vatheuer, Nils
Murrenhoff, Hubertus
Efficient hydrostatic heavy-duty drive train in renewable energy branch
Contribution to a book, Contribution to a conference proceedings (2011)
Vatheuer, Nils
Schmitz, Johannes
Murrenhoff, Hubertus
Hydrostatic Drive Train in Wind Energy Plants
Contribution to a book, Contribution to a conference proceedings (2011)
Schmitz, Johannes
Vatheuer, Nils
Reinertz, Olivier
Murrenhoff, Hubertus
Vollhydrostatisches Hauptgetriebe für Windenergieanlagen
Contribution to a book, Contribution to a conference proceedings (2011)
Vatheuer, Nils
Schmitz, Johannes
Murrenhoff, Hubertus
Hydrostatic drive train in Wind Energy Plants
Contribution to a conference proceedings (2011)
Schmitz, Johannes
Vatheuer, Nils
Murrenhoff, Hubertus
Development of a hydrostatic transmission for wind turbines
Contribution to a book, Contribution to a conference proceedings (2010)
Schmitz, Johannes
Vatheuer, Nils
Murrenhoff, Hubertus