不平衡电压下基于Y源双级矩阵变换器的微分平滑控制策略

Differential Flatness Control Strategy Based on Y-source Two-stage Matrix Converter Under Unbalanced Voltage

当电网电压产生不平衡工况时,电流电压会出现较大的波动,YSTSMC采用传统PI控制器难以调节电能质量。为了完善不平衡电网电压下Y源双级矩阵变换器(YSTSMC)的输入控制,提出了微分平滑控制(DFC)策略,并利用动态调制系数降低不平衡工况下有功功率所产生的高次谐波波动。仿真实验结果表明,基于DFC控制策略可以使系统的响应速度和输出电能质量得到提高。

When the grid voltage produces unbalanced conditions,the current and voltage will have large fluctuations,and it is difficult to regulate the power quality of Y-source two-stage matrix converter(YSTSMC)using the traditional PI controller.In order to improve the input control of the YSTSMC under unbalanced grid voltage,the differential flatness control(DFC)strategy is proposed,and the dynamic modulation coefficient is used to reduce the high harmonic fluctuations produced by active power under unbalanced conditions.The results of simulation show that DFC-based control strategy can improve the system response speed and output power quality.