一种改进型逆变器控制策略的研究

Research on Control Strategy of an Improved Inverter

通过比较单极性和双极性调制方式的优缺点,指出目前常用的单极性控制策略存在输出电压过零点振荡的现象。针对正弦波电压过零点附近的振荡情况,提出一种半周期工频半周期高频的逆变器控制策略,在低频臂换向处无占空比突变,从而有效解决了输出电压过零点振荡问题,提高了波形质量。经过仿真和电路实验与前快后慢逆变控制方式比较,证明了所提出的改进型逆变器控制策略的有效性。

By comparing the advantages and disadvantages of monopolar and bipolar modulation methods,it is pointed out that the current common monopolar control strategy has the phenomenon of output voltage zero crossing oscillation.A half cycle power frequency half cycle high frequency inverter control strategy is proposed for the sinusoidal voltage oscillation near the zero crossing point.There is no sudden change of duty cycle at the commutation of low frequency arm,which effectively solves the problem of zero crossing oscillation of output voltage and improves the quality of waveform.The effectiveness of the proposed control strategy is proved by simulation and circuit experiment compared with the former fast and later slow inverter control.