基于DSP单相两电平整流器的PWM控制方法

PWM Method for Single Phase Two-level PWM Rectifiers based on DSP

针对单相两电平PWM整流器,分析了其工作原理,并建立了数学模型。由于高速数字化处理器(DSP)的快速发展,采用传统的基于面积等效原理的PWM技术已能够实现。详细分析了基于预测电流控制的这种PWM原理。通过计算机仿真和基于TMS320F2812实验样机验证了该算法的可行性,并证明该调制算法不仅能有效抑制注入电网的谐波,而且可实现单位功率因数,获得直流侧电压的恒定和能量的双向流动。该算法可达到与SPWM等同的效果。

The principle of single phase two-level PWM rectifiers is analyzed and its mathematical mode is established.As digital processor is developed rapidly,PWM technique based on area equivalent method can be easily accomplished,the PWM technique with predictive current control is analyzed.A prototype based on TMS320F2812 was built to verify the performance of the control scheme,and simulation and experiment results show that the harmonics are suppressed effectively,the unity power factor is achieved,the DC link voltage is kept constant,the bi-directional energy flowing is implemented by the new modulation technique.The PWM method can achieve the same performance as SPWM method.