APF逆变器中死区效应研究

Research on dead-time effect of inverter in APF

有源电力滤波器APF(ActivePowerFilter)作为一种输出谐波的电力电子装置,其主电路中功率器件死区的存在将对整体的滤波补偿效果产生消极影响。从幅值和相位上分别对死区效应在谐波电流输出中的影响进行了分析,提出了死区补偿方法。通过对输出电流方向的判断,在一种新的改进规则采样法基础上进行脉宽调制PWM(PulseWidthModulation),以抵消死区效应对输出产生的消极影响,仿真验证了该方法的有效性。

APF(Active Power Filter) is a kind of power electronic device with harmonic output, while the existence of dead- time in its main circuitry causes negative effect on overall compen- sation results. The dead-time effect is analyzed from both magnitude and phase and an improved approach against it is presented. With the direction judgment of the output current,a new way of PWM (Pulse Width Modulation) is brought forward to eliminate the negative effect of the dead- time. The simulation verifies its effectiveness.