基于电流解耦的异步电机V/F控制补偿方法

针对异步电机恒压频比(V/F)控制低速性能不理想的问题,提出了一种新颖的定子电阻压降的补偿方法.该方法在对定子电流进行解耦的基础上,根据异步电机低频运行时简化的等值电路和矢量图,采用一种基于力矩电流的标量补偿方法对定子电阻压降进行补偿,并结合转差频率补偿,以实现电机低频时的自动转矩提升.该方法有效改善了异步电机V/F控制时的低速性能,保证低频运行时依然能获得额定磁通和相应的转矩.基于Saber软件的仿真结果表明:采用补偿方法后,电机能够带额定负载稳定运行在2 Hz工况下,电机的带负载能力有明显的提高,补偿后的机械特性略有上扬.

A study on compensation of the V/F controlled induction motor drives based on decoupled stator current

A novel compensation method for the current-resistant stator voltage drop is presented in the paper to improve the performance of the V/F controlled induction motor drives.According to the simplified per phase equivalent circuit and vector diagram of induction motor in low frequency,the slip frequency and current-resistant stator voltage drop are estimated and compensated based on flux and torque component of the stator current in the rotor-flux oriented reference frame to boost the torque and keep the stator flux constant. The compensation method can improve the performance of the V/F controlled induction motor drives in low frequency region.The simulation result shows that,by using the proposed method,the speed can be controlled down to 2 Hz with full load torques.