改进型磁链观测器在双馈风电机组中的应用

Improved Flux Estimator Application in Doubly Fed Induction Generator of Wind Power System

磁链信息是双馈风力发电机控制器有效转矩控制的基础,针对双馈风力发电机提出了一种新型的带前馈补偿的电压模型观测转子磁链的方法。该方法能有效解决纯积分器存在的直流偏置、积分饱和等问题;采用预估磁链来补偿由于惯性环节带来的相位滞后。通过仿真实验对纯积分器和改进型磁链观测器进行了对比,仿真结果可看出,改进型磁链观测器能很好地抑制直流偏置产生的漂移。在此基础上建立了双馈风力发电机模型和磁链观测器,结果表明该磁链观测器的有效性,可行性。

In doubly fed induction generator of wind power system control technology,flux information is the basis of effective torque control. A kind of novel method of observation rotor flux for doubly fed induction generator of wind power system was proposed. It was adopted in the new voltage model method that was compensated with feed forward. The problem such as DC bias and integral saturation caused by the pure integrator could be effectively solved.In this method,the estimated flux was used to compensate the phase lag caused by the inertia element. The pure integrator and improved flux estimator were compared according to simulation experiment. The simulation results show that improved flux estimator is a very good suppression of the drift caused by DC bias. The doubly fed induction generator of wind power system model and flux estimator were established according to method,and the results show that the method mentioned above are effective and feasible.