An international forum for exchanging knowledge and experience within the
field of wind farm modelling for power system studies will be initiated
through the execution of this proposed Annex supported specifically by
organisation of a series of workshops and meetings. Themes for the
workshops may include:
of Annex status and plans
of wind farm models including comparisons against measurements
discussions on needs for improvements and further developments
workshops and meetings are scheduled to take place on an annual basis and
will possibly be coordinated with other wind energy events to try to
attract involvement of all major players, including manufactures and
Through discussions at workshops and meetings, a procedure for benchmark
testing using data from the common database (see below) will be specified
to provide a common basis for model validation. The Annex participants are
then expected to test their models accordingly and provide validation
results in the form of reports or papers. These will be topics for
discussions at the workshops where key issues for further model
development will be pinpointed.
The set-up and operation of a common database for benchmark testing of
wind turbine and wind farm models is considered crucial for the further
efficient development of good quality wind farm models. As to set-up the
database, the following activities are scheduled:
of a set of wind turbines and wind farms to be included in the
database. The wind turbines and wind farms should constitute a
representative collection with regards to wind turbine types (fixed
speed, variable speed, etc), wind farm size and site conditions
(turbulence level, grid characteristics, etc.).
and set-up of database structure.
technical data required for accurate modelling of the wind turbines
and wind farms. The data should constitute detailed wind turbine data,
internal grid specifications and grid connection characteristics.
measurement data from the wind turbines and wind farms as required for
verification of models. The data should include measurements of
metrological conditions (wind speed and direction) and electrical
characteristics (active and reactive power, voltage and currents) at
the common connection point of the wind farm and at a number of the
individual wind turbines within the farm. Preferably the data should
contain measurements taken both during continuous operation at
different wind speed conditions and during special events such as
short-circuit faults, generator switching and capacitor energizing.
The required sample rate may vary from about 1 Hz with regards to
metrological conditions to about 20 Hz during continuous operation and
several kHz during special events.
data will be gathered as provided by the Annex participants that they may
already have on file or may collect through their relevant ongoing
projects, subject to the applicable intellectual property provisions set
forth in this Annex. It may also be considered to take a common initiative
with regards to acquiring data, e.g. by contacting wind turbine
manufactures as to get technical data, though the Annex will not be
responsible for making measurements.