electrical certification of wind turbines at dynalab · 3rd annual international workshop on . grid...
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Electrical Certification of Wind Turbines at DyNaLab
WIND ASSURING CONFIDENCE THROUGH COMPETENCE
Torben Jersch, Dr. Christian Mehler, Bernd Tegtmeier
3rd Annual International Workshop on GRID SIMULATOR TESTING
OF ENERGY SYSTEMS AND WIND TURBINE POWERTRAINS
November 5-6, 2015 - Tallahassee, Florida, USA
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Short profile of Fraunhofer IWES North-West
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Managing Director: Prof. Dr.-Ing. Andreas Reuter Research spectrum: Wind energy from material development to grid connection Operational budget 2014: around 13,2 million € Staff: 150 employees Previous investments in the establishment of the institute: € 60 million
Strategic Association with ForWind and the German Aerospace Center (DLR)
Short profile of Division Wind Turbine and System Technology
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Division Manager: Prof. Dr.-Ing. Jan Wenske
Research spectrum: Structural durability, mechatronics, power electronics and control in the area of entire wind turbines Large scale test benches for mechanics, electronics and Power mechatronics
Staff: 30 employees
Division locations: Bremerhaven – Hannover
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DyNaLab – 10 MW full nacelle testing
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Hydraulic load application unit Simulation of mechanical wind loads 1.2 MW Hydraulic Power Thrust: ± 1900 kN Radial loads: ± 2000 kN Bending moments: ± 20000 kNm (rotating y-, z-axis) Dynamic: 0-2 Hz 0-G System
Drive 5° inclined Drivetrain 10 MW (15 MW Overload) Direct drive 8.600 kNm (13.0000 kNm Overload) Torque Flexible Coupling Hydraulic safety clutch
Gridsimulator 10/20/36 kV nominal voltage levels 44 MVA installed converter power LVRT & HVRT Simulation < 2% THD at 50 Hz
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Scope of nacelle testing on DyNaLab test bench
Creating a genuine added value
for all participants
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Electrical Certification of WECs on test benches – Acceptance?
How to introduce a new technology? What is different at test bench certification?
Simulation of Grid events
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Simulation of Rotor
Convincing Entities
No LVRT Container
No Rotor No Wind
Argumentation have to include existing test
procedures
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Source: Idom
WEC Controller
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Simulation of realistic rotor behavior at DyNaLab
Wind
Generator Torque
MAirgap
MFlange MGenerator
Accuracy of real time the model?
Pitch
Wind
Torque at Flange
Pitch model? Accuracy?
Proper working DT-
Control?
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Electrical certification processes
Design of Wind turbine
Load Calculation
Construction and Erection of WEC
Type Certification
Load Measurement
Electrical certification
Derive real time model
Creation of WEC Model Tests
Load Validation
Accuracy of models has sufficient precision and
is well know from certification process
FAST
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LVRT-Container Testing
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-5%
20%
45%
70%
95%
-0,1 0,4 0,9 1,4 1,9 2,4 2,9 3,4
U/Un
Time [s]
LVRT of different Grid Codes
Deutschland Irland Italien
Portugal USA Spanien
Schweiz Dänemark Großbritannien
Source: IEC 61400-21
Grid Codes: Triangle voltage sags
Typical LVRT-Container can only provide rectangular voltage sags
Also shown in IEC 61400-21 (unprecise sketch)
Source: IEC 61400-21
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Emulation of LVRT - Dynamic slope of voltages
Reproducing voltage sag triangle within several tests
High dynamic voltage slope to receive rectangular voltage curves
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Source: TN066, DNV-GL
DNV-GL TN 066 Required slope of
1 ms
IWES approach:
Reproduce state of the art electrical certification at
DyNaLab
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Reproducing Voltage Sag of LVRT-Container
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200 ms at 0.2 PU
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Reproducing Voltage Sag of LVRT-Container 2 Phase – Profile editor
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Commanding each
Phase separately
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Reproducing Voltage Sag of LVRT-Container 2 Phase
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Voltage Sag to 0V
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Active Flux Control
Residual Voltage below
5%
Ramp up 0% - 50% in 1ms
50% -100% in 10ms
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Detailed view on voltage drop
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Voltage drop in1.1 ms
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Detailed view on voltage return
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Voltage return up to 0.5 PU approx. 1 ms
No residual Voltage
Voltage return 0.5 PU -1 Pu approx. 10 ms
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Outline – Improvement of Voltage quality Design of a small HF-Filter
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Increase Acceptance of Electrical certification on Test Benches
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Technical Guideline FGW TR3 - Technical Committee electrical certification on test
benches
Objective: Defining the process of electrical certification on test benches and write them down in national standard
Defining the requirements of Wind Turbine Defining the requirements for test benches Participants: Manufacturer of Wind Turbines, Measurement Institutes, Certification Companies, Research Institutes
Presentation and discussion on international workshops
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THANK YOU FOR
YOUR ATTENTION Any questions? [email protected] [email protected] [email protected]
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Allgemeines schönes WEA Bild
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Acknowledgements
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Fraunhofer IWES North-West is funded by the:
Federal State of Bremen
Senator für Umwelt, Bau, Verkehr und Europa Senator für Wirtschaft und Häfen Senatorin für Bildung und Wissenschaft Bremerhavener Gesellschaft für Investitions-Förderung und Stadtentwicklung GmbH
Federal State of Lower Saxony Federal Republic of Germany: BMWi Federal Ministry for Economic Affairs and Energy BMBF Federal Ministry of Education and Research
with support of the European Regional Development Fund (EFRE)
NiedersachsenNiedersachsen
EUROPEAN UNION: Investing in your future European Regional Development Fund
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Lower Saxony
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