Research Of Cut-in Control Strategies For Doubly-fed Induction Wind Power Generator

The utilization of wind energy which is clean has become more and more important in electric power.The generator cutting-into grid is the start-point for wind power generator normal operating.In this paper,the no-load cutting-into grid control strategy has been studied,and the simulation research has also been done by combing the power control after cutting into grid.Because fixing speed sensor on variable-speed variable-frequency wind power generator has many defects,a sensorless vector control scheme for variable-speed constant-frequency wind power generation system is proposed in this paper.The active power and reactive power control can be decoupled by trasplating the stator field-oriented vetor control scheme into grid-cuting.Because the regulation performance of reactive power has a great advantage compared to asynchronous wind turbine,so,the calculating method of reactive power for DFIG es reseached and the distribution scheme is also analyzed in this paper.