An improved rotorside control strategy of doublefedwind turbine generation system
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Abstract:
Based on a onsite wind turbine’s output activepower vs. generator speed curve, the shortage of conventional power control strategies of doublyfed wind turbine generation system are analyzed. Considering the generator speed restriction and activepower fasttrack control requirement, the power decoupling control strategy in the rotorside converter and variable pitch control strategy are improved, that is, an output mechanical torque of wind turbine and the generator speed of DFIG are used in the rotorside active power control loop in order to achieve an accurate optimal speed control, as well as a direct activepower control method is also adopted in the variable pitch control strategy. Finally, the overall operational performances of DFIG wind turbine generation system using the proposed control strategies are simulated, and also compared with the conventional control strategies. The results show that the improved control strategy is more valid and correct.
