Hydraulic Soft Yaw System

LOAD REDUCTION AND PROTOTYPE RESULTS

S. Stubkier, H. C. Pedersen and K. Markussen

• Introduction• System description• Simulation setup• Load reduction• Results of controlled slippage• Test rig presentation• Measurement results• Conclusion and Future prospects

Agenda

• Same load on all pinions at all times– Backlash has no influence on loading

• Well defined extreme slippage• Fatigue load reduction• Ultimate load reduction• Lower tear and wear – increased yaw activity• Higher power to volume ratio

Main benefits of hydraulic yaw

System Description

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System Description

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System Description

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System Description

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System Description

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System Description

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System Description

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System Description

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System Description

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System Description

Possibility of .dll or .mex file interface to your turbine code with full model of hydraulic yaw system.

Simulation Setup

Load Reduction

Controlled Slippage

Controlled Slippage

8 electrical servo drives;Speed, torque and position

control; 22.7 Nm

8 hydraulic gear pumps/motors; 32 cc, T-max 164 Nm8 gears for electrical drives;

r=10348 gears for hydraulic drives;

r=323 4x12.5 liters High Performance Nitrogen Accumulators

Torque and Speed transducers

Temperatures and pressure measurements

Control and Power PackSpecial designed HWP Manifolds

Measurements from Test Rig

• Little to no influence

Influence on energy production

• Off grid operation– Self yaw by wind load– Energy harvesting from main shaft– Down wind stable turbine

• Fault detection– Simple pressure measurements– Frequency analysis

• Lower COE

Features of hydraulic yaw system

• Advantages– Same load on all pinions at all times– Backlash has no influence on loading– Well defined extreme slippage– Fatigue load reduction– Ultimate load reduction– Lower tear and wear – increased yaw activity

Conclusion

Thank you for your attention

Søren Stubkiersst@hydratech-industries.com

Conclusion