改进数字PWM对逆变器响应延迟的改善

Improvement of Improved Digital PWM on Inverter Response Delay

详细分析了对称规则采样数字脉宽调制(PWM)和单极性倍频PWM所引起的逆变器响应时间延迟,并定量得出了时间延迟的变化范围。针对该问题,对数字PWM控制方式进行改进,提出了多次采样延时数据更新的控制方法,以提高系统的采样和数据更新频率,改善逆变器响应时间延迟。最后,分别在每个开关周期采样及数据更新次数为1,2,4的情况下进行了多次实验,实验验证了理论分析的正确性和实用性,以及多次采样延时数据更新方法对于逆变器响应时间延迟的改善效果是显著的。

Inverter response delay that is caused by symmetrical rules sampling pulse width modulation （PWM） and si- ngle polarity PWM is analyzed and the range is quantitatively determined.In order to increase frequency of sampling and data updating and improve inverter response time delay, multiple sampling and tardive updating is proposed which is an improved digital PWM.Finally,several experiments are made with 1,2 or 4 sampling and data updating per switch period.And experimental data demonstrates that theoretical analysis method is correct and practical and the improvement effects of inverter delay are significant.