Small Wind Turbine Testing
The aim of the tests was to produce the power curve of the small wind turbine (SWT) and the efficiency curve of the battery connected SWT system, while also verifying its endurance in extreme conditions of wind, and thus its potential for future replicability in Nepal. The project will bring technical confidence to the SWT designs while being able to create a precise specification of the system components. This is necessary for delivering services and maintenance, which is constantly required by SWT systems technology.
Members of KAPEG visited Athens, Greece and worked with the team at National Technical University of Athens (NTUA) for 2 weeks. The activities were concentrated on wind turbine alternator bench testing and field testings.
A 0.6m small wind turbine alternator was tested in the standard bench testing facility at the lab of NTUA. The wind turbine is a 0.6m Hugh Piggot design constructed with the locally available materials.
Bench testing picture
The field testing of the small wind turbine is conducted at the small wind turbine testing facility of NTUA at Meltemi Rafina. The small wind turbine test site in Rafina allows for outdoor measurements of the power and energy production of household small wind turbines for grid connected and battery charging applications. The facilities of the test site are in accordance to the IEC international standard IEC 61400-12-1: Power Performance Measurements of electricity producing wind turbines, and specifically of Annex H which refers to small wind turbine testing.
With the use of the standard one can plot the power curve, the system’s power coefficient Cp and also predict the annual energy production of the turbine for different mean wind speeds. Further, the appropriate manner of installing meteorological and electrical sensors, the way to analyze logged data and the way that they are to be presented, are all determined as well as the procedure for estimation of uncertainties.