感应电机非线性输出反馈控制变频调速系统

Variable frequency driving system of induction motors based on nonlinear output feedback control

针对以定子电压为控制量的交流感应电机调速系统存在的系统结构复杂、实时计算量大的缺点,提出了一种感应电机的非线性输出反馈控制变频调速方法。该方法依据感应电机的降阶模型,采用非线性输出反馈控制技术设计外环转速与磁链控制器,以滞环比较器作为内环电流跟踪控制器,直接产生PWM信号控制电压源逆变器,驱动感应电机运行,实现了对光滑转速参考信号的渐近跟踪。仿真结果表明该系统不仅具有快速的动态响应性能,而且对负载扰动具有较强的鲁棒性。

Aiming at the drawback of complex structure and large real-time computing quantities of AC in- duction motor driving systems that using stator voltages as control actions, a nonlinear output feedback control method for variable frequency drives of AC induction motors was proposed. Based on the reduced order model of induction motors, the output feedback control technique was employed to design the outerloop speed and flux controllers of the driving system. And the hysteresis-band comparer was applied as the inner-loop current controllers, which directly produced PWM signals to control the voltage-source inverter to drive the induction motor. The proposed method can asymptotically track the smooth speed reference. Simulation results show that the driving system possesses not only fast dynamic performance but also strong robustness with respect to load disturbance.