死区对逆变性能的影响及其补偿方法

摘要

Basing on analyzing the dead-time effect on single-phase SPWM inverter's output waveform charac-teristics,a new control scheme was proposed to improve dead zone effect.Through adopting DC bus voltage feed-forward compensation measures to adjust wave shape at real time, the third harmonic component in the output voltage was reduced effectively and the dead-time effect on the inverter performance was improved to a greater extent through combined with current feedback pulse adjustment and repetitive control.The relevant experiments on a laboratory-made inverter show that, the said methods can effectively improve the voltage waveform distortion and reduce the output voltage harmonic content.%在分析死区时间对单相SPWM逆变输出波形特性影响的基础上,提出一种新的方案来改善死区效应.通过采用直流母线电压前馈补偿的措施来实时调整载波形状,可以有效降低输出电压的三次谐波,同时结合电流反馈脉冲调整和重复控制来更大程度地改善死区对逆变性能的影响.在实验室自制的逆变器中进行了相关实验,结果表明:所提方法可以有效改善电压的波形畸变,降低输出电压的谐波含量.