An improved control strategy for Doubly-fed Wind power Generation based on inverse system theory

Vector control method is the common way in traditional Double-fed Wind Generation, but it is more dependent on motor parameters, once the operational situation changes, the effect of the system control will be affected. This paper proposes a control method based on inverse system, through the inverse system theory, the state equation of doubly-fed induction motor (DFIG) and power converter, to construct the structure of the DFIG wind power generation inverse control system. Finally, the corresponding wind power generation closed-loop control system is established. When the system operates in variable speed constant frequency (VSCF) and the phase voltage drops, the simulation results show that the control system can keep the DC link voltage steady, maintain unity power factor, achieve the decoupling of the active and reactive power. It proves that this control method used in VSCF wind power generation is feasible.