三电平背靠背传动系统无速度传感器控制

Three-Level Speed Sensor-Less Back-to-Back Control System

在介绍通过三电平构成的整流-逆变背靠背系统的基础上,研究了三电平的空间电压矢量控制算法,通过采用基于时间因子的中点电压平衡控制方法控制中点电位偏移,进而构建无速度传感器的三电平传动系统,最后通过MATLAB/Simulink仿真分析了电机的加减速工况。结果证明系统具有稳定的性能,中点电位平衡得到了良好控制,并且应用的无速度传感器方法对异步电机的转速辨识具有良好的精度和快速的动态响应。

Abstract： The three-level rectifier-inverter back-to-back system was introduced, based on SVPWM and the control of neutral point potential shifting in three-level PWM rectifier, which was realized by the time factor method. Then, the three-level speed sensor-less transmission system was built and the acceleration and deceleration of motor through MATLAB/Simulink was analyzed. The results showed that the system had a stable performance, the neutral point potential was well-controlled, and the application of speed sensor-less made the induction motor possess a good accuracy and fast dynamic response.