基于DSP28379的改进线性自抗扰电动机矢量控制实验设计

Design of Motor Vector Control Experiment Based on Improved Linear Active Disturbance Rejection Control

为了提升交流电动机的响应速度和抑制中频扰动的能力,设计并搭建了基于TMS320F28379D的改进线性自抗扰三相电动机矢量控制实验平台。硬件以双核DSP芯片为控制核心,系统时钟频率200 MHz;采用高集成度智能功率模块驱动电动机,无需光耦隔离驱动;利用旋转变压器测量电动机转速和位置信息,搭配解码芯片可实现16 bit高精度测量。软件以传统线性自抗扰算法为基础,改变扰动反馈通道并在误差反馈通道中加入低通滤波器,从而提出一种改进线性自抗扰控制算法,并通过实验进行实物验证。结果表明:相比于传统PI和线性自抗扰控制算法,改进算法的阶跃响应速度分别提升25%和18%,受瞬间扰动影响的转速跌落分别降低4倍和2倍,并且转速恢复时间分别减少85%和70%,大幅提升了系统的动静态特性。

An improved linear active disturbance rejection vector control experimental platform for three-phase motor based on TMS320F28379D is designed for high precision AC motor vector control experiment.Dual-core DSP chip is taken as the control core,and the system clock frequency is 200 MHz.High integration intelligent power module is adopted to drive motor,optocoupler isolation drive is not needed.The speed and position information of the motor are measured by using the resolver,which can achieve 16-bit high-precision measurement with the decoder chip.In terms of control algorithm,based on the traditional linear ADRC algorithm,the disturbance feedback channel is changed and a low-pass filter is added to the error feedback channel,and then an improved linear ADRC algorithm is proposed and verified by physical experiments.Compared to the classical PI and linear ADRC,the response velocity of the improved algorithm driven by the unit step signal is increased by 25%and 18%,the speed drop affected by the instantaneous disturbance is reduced 4 times and 2 times,and the speed recovery time is reduced by 85%and 70%,respectively,which greatly improves the dynamic and static characteristics of the system.