全数字矢量控制SVPWM的变频调速系统实现

Realization of digital vector controlled SVPWM frequency-variable speed-adjustable system

运用矢量控制并结合电压空间矢量脉宽调制(SVPWM)技术,开发了以数字信号处理器(DSP)芯片TMS320LF2407为核心的全数字矢量控制的变频调速系统。对系统总体设计方案进行了研究分析,硬件设计中详细介绍了控制回路的电流检测模块、电机转速和位置检测模块、PWM输出和故障输入电路。软件控制程序主要由主程序和SVPWM中断服务子程序组成,主程序主要完成DSP各功能部件的初始化、参数设定及转速实时显示;SVPWM中断服务子程序主要完成电流值采样、当前转速和θ值的计算等。实验结果表明:该实验装置结构简单,控制精度高,输出电流谐波失真小,有较强的实时性。

By using field oriented control and voltage SVPWM（Space Vector Pulse Width Modu- lation） ,a suit of digital vector controlled frequency-variable speed-adjustable system based on DSP （Digital Signal Processor） TMS320LF 2407 is developed. The overall design scheme is researched. The hardware of current detection module,motor speed and location detection module and PWM output and fault input module is introduced in detail. The software is composed of main program and SVPWM interrruption subroutine. The former realizes DSP initialization,parameter setting and speed real-time display,and the latter realizes current sampling and the calculation of current, speed and θ. The experimental results indicate that the prototype has simpler hardware construction,higher control precision,less output current harmonics distortion and better real-time performance.