Efficiency of three wind energy generator systems
Artikel i vetenskaplig tidskrift, 1996

This paper presents a method to calculate the average efficiency from the turbine shaft to the grid in wind energy converters. The average efficiency of three 500 kW systems are compared. The systems are: a conventional grid-connected four-pole induction generator equipped with a gear, a variablespeed synchronous generator equipped with a gear and a frequency converter, and a directly driven variablespeed generator equipped with a frequency converter. In this paper it is shown that a variable-speed generator system can be almost as efficient as one for constant speed, although it has much higher losses at rated load. The increased turbine efficiency that variable speed leads to has not been included in this paper. It is also found that a directly driven generator can be more efficient than a conventional four-pole generator equipped with a gear.

Wind energy

Variable speed


Frequency converter


Constant speed


Directly driven generator



Anders Grauers

Institutionen för elkraftteknik, Elmaskinteknik och kraftelektronik

IEEE Transactions on Energy Conversion

0885-8969 (ISSN)

Vol. 11 3 650-657


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Annan elektroteknik och elektronik