异步电机按定子磁场定向的转差频率控制

Stator-flux-orientated slip frequency control for induction motor

在分析现有转差频率控制方案优缺点的基础上,提出一种按定子磁场定向的转差频率控制方案。利用坐标变换和磁场定向原理,建立按定子磁场定向的异步电机数学模型。新系统通过定子电压直轴分量直接控制定子磁链的变化率;在转速通道中,电流调节器的输出作为转差频率,继承了标量型转差频率控制方案的优点。新系统的动态控制算法不依赖于转子电阻和电感参数。结果表明,新系统具有良好的静、动态性能和鲁性棒。

By analyzing existing slip frequency control strategies, a stator flux orientated control method is proposed. Based on the transformation of coordinate and flux orientation, the mathematical model of induction motor is derived. In new system, variation of stator flux linkage is directly controlled by d-axis stator voltage; in speed control channel, output of current controller is used as slip frequency, which inherits the advantage of former slip frequency control strategy. The control algorithm of new system is independent on the rotor resistance and inductance. Results of MATLAB simulation and experiment show that the new system displays high static and dynamic performance and robustness.