【摘要】 针对矩阵变换器的非对称输入情况,分析了其虚拟直流电压与输入电源的关系,推导了在非对称输入时虚拟直流电压的表达式,提出了基于虚拟直流电压预测的调节控制策略,即在一个开关周期内实时预测虚拟直流电压,通过预测调节系数对虚拟直流电压进行补偿,维持其为恒定值。该方法不仅降低了交流直接供电下输入电源不对称对输出的影响,使输出SPWM的控制可借鉴传统逆变器的经验,而且保证了矩阵变换器输入空间矢量的正确调制。给出了预测调节控制的原理及具体实现方法。仿真及试验结果表明,虚拟直流预测策略适用于交流变频驱动系统,可有效抑制输入不对称的影响,提高矩阵变换器在交流驱动场合的实用性。更多还原

【Abstract】 Considering the unbalanced input condition,this paper finds out the relationship between the fictitious DC voltage and the unbalanced inputs.A prediction control method of fictitious DC voltage is presented in order to restrain the unbalanced situation.The fictitious DC voltage is calculated online to confirm the variable of prediction control in every switching period.This method not only reduces the disturbance of outputs caused by unbalanced inputs,but also promises the correct modulation of the input space vector.The control principle and realization of the prediction method are presented in detail.The simulation and experimental results show that this prediction modulation of the matrix converter is suitable to be applied in AC drive system and the unbalanced inputs are adapted so as to improve the practicality of the matrix converter.更多还原