基于三电平逆变器的异步电动机直接转矩控制新方法

A Novel DTC Algorithm for Induction Motor Based on Three-level Inverter

在异步电动机数学模型和三电平空间矢量调制法的基础上,提出了一种基于三电平逆变器的异步电动机直接转矩控制新方法。新方法将砰-砰控制和开关矢量查表法相结合,通过最优固定合成矢量的选择,既有效地抑制了三电平直流侧中点电压不平衡、限制了输出电压变化率dv/dt并降低了开关损耗,又使系统获得了良好的稳态和动态性能。理论分析和仿真结果证明了该控制方法的合理性和可行性。

It presents a novel direct torque control （DTC） strategy for three-level inverter based on mathematic model of induction motor and three-level space vector modulation. The new control algorithm selects optimal fixed synthesizing vectors using bang-bang control and switching vectors table. The drive system has excellent steady-state and dynamic performance with neutral-point voltage unbalance problem solved, dvldt of output voltage restrained and switching loss reduced. Analysis and simulation results show the correctness and feasibility of this control scheme.