变频调速技术在风机水泵负载上的应用

Technology of Variable Frequency Speed Regulation Applied in Fan or Pump Load

对拖动风机、泵类负载的大功率电动机采用变频调速是现在节能措施中极为重要的手段。空间电压脉冲宽度调制(Space Vector Pulse Width Modulation,SVPWM)技术应用于变频调速系统中不但改善了脉冲宽度调制(Pulse Width Modulation,PWM)技术存在电压利用率偏低的缺点且具有转矩脉动小、噪声低等优点。给出了一个以TMS320LF2407A型数字信号处理器(Digital Signal Processor,DSP)芯片为控制电路核心的异步电机SVPWM矢量控制调速系统,在介绍SVPWM基本原理的基础上对系统硬软件设计进行了分析。试验结果表明,该调速系统具有优良的动、静态特性和较好的控制效果,因此在风机、水泵等高能耗设备方面拥有广阔的应用前景。

For large power motors with fan or pump load, variable frequency speed regulation is an important means of energy saving. SVPWM （ Space Vector Pulse Width Modulation） technology applied in variable frequency speed regulation system can not only improve the shortcoming of low voltage utilization in the PWM technology, but also have advantages of small torque ripple and low noise. In this paper, a SVPWM vector control AC asynchronous mo- tor speed regulation system employing a core TMS320LF2407A-type DSP chip is presented. The basic principle of voltage space vector control is introduced, and the design of hardware and software in the system is analyzed. The obtained experimental results indicate that the speed regulation system has excellent dynamic and static performance and good control effect, so it has vast application prospect in high energy consuming devices such as fan and pump.