级联型多电平变换器调速系统矢量控制的研究

在对基于载波相移技术级联型多电平变换器电路拓扑的工作原理和控制策略分析的基础上,将转差频率矢量控制引入了对异步感应电机的高精度控制,通过坐标变换将异步电动机在三相静止坐标系上的数学模型转化为两相旋转坐标系上的数学模型,将定子电流矢量分解为励磁和转矩2个直流分量并分别加以控制,从而实现磁通和转矩的解耦控制,通过仿真验证了基于载波相移技术的级联多电平变流器调速系统矢量控制的可行性。

Research of Vector Control of Speed Regulation System Based on Cascade Multilevel Inverter

On the basis of principle and control strategy of circuit topology of cascade multilevel inverter based on carrier phase-shifted PWM being analyzed,rotation difference frequency vector control is introduced into a cascaded multilevel inverter system to realize high precision control of asynchronous motor,through the coordinate transformation,the mathematical model of an asynchronous motor on a three-phase stationary coordinate is translated into a model on a two-phase rotating coordinate,also the stator current is decomposed into two DC parts including excitation and torque,which are controlled respectively,thus the magnetic flux and torque are decoupled to be control,the feasibility and correctness of the vector control of cascade multilevel inverter based on carrier phase-shifted PWM are verified by simulation.