Doubly Fed Induction Generator Systems for Wind Turbines.pdfVIP

B Y S . M Ü L L E R , M . D E I C K E , R I K W . D E D O N C K E R A viable alternative to ADJUST SPEED over a wide range at MINIMAL COST S A HE AIM OF WIND TURBINE SYS- I / G TEMS DEVELOPMENT is to contin- R O E. uously increase output power. A few E T E I. years ago, the rated output power of W W production-type units reached 200 kW. By 1999, W • the average output power of new installations 2 0 climbed to 600 kW. The largest series production 0 2 E units today are specified to deliver 1.5-MW output N U J | power (Table 1). It is anticipated that in the near fu- Y A M ture, power rating of wind turbines will increase fur- • ther, especially in offshore applications. For E N I example, the prototype of a Nordex N80 with a rated Z A G power of 2.5 MW was installed in March 2000 near A M Aachen. S N O Many low-power wind turbines built to-date were I T A C constructed according to the “Danish concept” (Fig. 1), I L P in which wind energy is transformed into electrical en- P A