ECN publication
EeFarm II. Description, testing and application
Pierik, J.T.G.; Axelsson, U.; Eriksson , E.; Salomonsson, D.
Published by: Publication date:
ECN Wind Energy 24-2-2011
ECN report number: Document type:
ECN-E--09-051 ECN publication
Number of pages: Full text:
175 Download PDF  

In this project, a user friendly computer program, EeFarm-II, for wind farm electrical and economic evaluation has been developed. EeFarm-II has been built as a Simulink Library in the graphical interface of Matlab-Simulink. The EeFarm-II Library consists of wind farm component models, such as models of wind turbines, generators, transformers, AC cables, inductors, nodes, splitters, PWM converters, thyristor converters, DC cables, choppers and Statcoms.
Each EeFarm-II component model calculates the output voltage and current phasor (AC) or voltage and current value (DC) based on the input voltage and current and the component parameters. This is repeated for the complete operation range of the wind farm, i.e. the range of input wind speed. Secondly, the total price of the electrical system (if wind turbine prices are not included) or of the wind farm (if wind turbine prices are included) is determined. Based on the output power for each wind speed bin and the wind speed distribution, the annual produced energy is determined. The final step is the calculation of the Levelised Production Costs (LPC).
After EeFarm-II testing at ECN, the program has been made available to Vattenfall for testing and application.
EeFarm-II has also been used to re-evaluate the thirteen electrical systems of the Erao-1 study of 2001.

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