基于直接转矩控制的双馈感应电机速度及无功控制

基于直接转矩控制原理,给出了双馈感应电机一个新的转子速度与定子侧无功控制策略。通过适当选择转子侧电压矢量,即可通过转矩内环和转子磁链幅值内环达到速度与无功控制。所研究的系统当其用于拖动场合可提高用户端功率因数,用于风力发电场合在进行最大风能跟踪的同时可参与电网无功调节。对一个由15 kW双馈感应电机构成的系统进行了仿真实验,结果显现本策略在速度与无功指令值及定、转子电阻变化时所具有的有效性和鲁棒性。

DTC-based Speed and Reactive Power Control for a Doubly-fed Induction Machine

Based on the famous direct torque control(DTC) principle,the paper presents a novel control strategy of rotor speed and stator reactive power for a doubly-fed induction machine,which is realized by selecting appropriate voltage vectors on the rotor side.The main idea is that speed control and reactive power control are respectively by means of a torque inner loop and a rotor flux amplitude inner loop.The system we explored can be applied to(i) driving systems aimed at raising user side power-factor,and(ii) wind power generation systems aimed at tracking the maximal power point and regulating reactive-power of grid.Simulation results on a 15 kW DFIM system are provided to demonstrate the effectiveness and robustness of the proposed control strategy during variations of speed and reactive power references,some machine parameters,and load.