Measurement of the system behaviour of WT
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The objective of wind turbine behaviour measurements and tests (basic testing) is the verification of parameters and characteristics upon which the design of the wind turbine was based.
This is based on the IEC WT01 “System for conformity testing and certification of wind turbines – Rules and procedures”, which is further specified by the following national certification guidelines:
- Guideline for the Certification of Wind Turbines by Germanischer Lloyd,
- IEC 61400-1:2005 Wind turbines – Part 1: Design requirements (DIN EN 61400-1:2005 / VDE 0127-1 Wind turbines – Part 1: Design requirements)
- Functional test of the wind turbine (start, stop, etc.),
- Functional test of the protection system,
- Test of the safety system,
- Test of the braking system,
- Test of automatic operation,
- Test of switching operations,
- Measurement of component natural frequencies and
- Measurements on the effectiveness of wind tracking.
The tests of the system behaviour are completed by measurements of the power curve, noise emission, load and the power quality of the WT.
The tests of the system behaviour require the logging of numerous quantities of load (bending and torsion moments), quantities of the system (active power, rotational frequency, blade angle, brake pressure, …) and meteorological quantities (wind speed and direction, air pressure, air temperature, …) similar to a load measurement according to IEC 61400-13 so that it is recommended to carry out the basic test combined with a load measurement.
Within the scope of the tests of the protective device of the WT overspeed tests in the operational and high-wind range are carried out. The adjacent illustration exemplarily shows the time series of the wind speed and of the rotational frequencies (high speed shaft and main shaft) during an over speed test.
