提出了一种由正弦脉宽调制技术(sine pulse width modulation,SPWM)衍生的新的控制方法。这种方法由直流侧电容电压调整电路的输出,获得期望的电网电流幅值,并基于SPWM逆变器输出等效调制信号的原理,以单位化的电网电流作为生成控制逆变器开关动作的PWM脉冲的调制信号,强迫电网电流跟随电网电压变化,得到期望的电网电流波形和相位。该控制方法简单直接,能够实现完全数字化控制。仿真和实验结果证明了该方法在谐波抑制和功率因数校正方面的有效性和可行性。 A new control method derived from sine pulse width modulation (SPWM) is proposed. In this method, the output voltage of the DC side capacitor voltage adjusting circuit is used to obtain the desired grid current amplitude. Based on the principle of SPWM inverter output equivalent modulating signal, the unitized grid current is used as a generator to control the switching of the inverter The modulation signal of the PWM pulse forces the grid current to follow the grid voltage change to obtain the desired grid current waveform and phase. The control method is simple and direct, enabling complete digital control. Simulation and experimental results show the effectiveness and feasibility of this method in harmonic suppression and power factor correction.