矩阵式变换器的输出电压补偿

为了减小矩阵式变换器输出电压误差和输出电流畸变,提出了一种输出电压补偿方案。针对不同的输出电压误差成因采用不同的补偿方法,直接脉宽补偿用于多步换流和器件开关延时,等效电压补偿用于器件导通压降。在矩阵式变换器-异步电机矢量控制系统上进行了实验研究。当输出频率为5Hz时,采用该补偿方案使输出电流总谐波畸变率(THD)从6.32%降低至4.92%;当频率为15Hz时,输出电流THD从5.46%降低5.30%。结果表明:采用该补偿方案可以有效抑制输出电流THD,在低速运行下补偿效果更加明显。

Output voltage compensation for matrix converter

An output voltage compensation strategy was developed to reduce output voltage errors and output current distortion in matrix converter.Direct pulse compensation is used for multi-step commutation and switching delays,while equivalent voltage compensation is used for power device on-state voltage losses.Experiments using a matrix converter fed induction motor vector control system show that for an output frequency of 5 Hz,the total harmonic distortion(THD)of the output current is reduced from 6.32% to 4.92% by the compensation strategy.For an output frequency of 15 Hz,the harmonic distortion is reduced from 5.46% to 5.30%.The results indicate that the THD of the output current is effectively restrained by the compensation strategy,especially at low speeds.