Control of DFIG Wind Turbine With Direct-Current Vector Control Configuration

The doubly-fed induction generator (DFIG) wind turbine is a variable speed wind turbine widely used in the modern wind power industry. At present, commercial DFIG wind turbines primarily make use of the technology that was developed a decade ago. But, it is found in this paper that there is a limitation in the conventional vector control technique. This paper presents a directcurrent vector control method in a DFIG wind turbine, based on which an integrated control strategy is developed for wind energy extraction, reactive power, and grid voltage support controls of the wind turbine. A transient simulation system using SimPower-System is built to validate the effectiveness of the proposed control method. The conventional control approach is compared with the proposed control technique for DFIG wind turbine control under both steady and gust wind conditions. The paper shows that under the dc vector control configuration, a DFIG system has a superior performance in various aspects.