The power ripple in the input filter is normally ignored in the conventional model predictive control scheme (MPC) of an AC/DC matrix converter under imbalanced grid voltage conditions. Unfortunately, this power ripple causes output power and current ripples. Some methods compensate this power ripple to obtain a ripple-free output current. However, these methods are generally complicated due to the increased computational and control burden or the use of a digital filter to estimate the power ripple. Moreover, the compensation of power ripple results in current distortion on the grid side, which has yet to be fully addressed. This paper presents an improved MPC scheme to simultaneously compensate input filter power ripple and reduce grid current distortion under imbalanced grid voltage conditions. The power ripple is calculated based on the grid voltage and its 90 electrical degrees delay signal, which makes the implementation simple without grid voltage components extraction or digital filter design. Furthermore, a closed-loop current controller is proposed to reduce the harmonic distortion of the grid current. The feasibility of the proposed MPC scheme is confirmed by both simulation and experimental results.

中文翻译：

---

考虑电网电压不平衡条件下输入滤波器电源纹波的改进的AC/DC矩阵变换器模型预测控制方案

在电网电压不平衡条件下，AC/DC 矩阵转换器的传统模型预测控制方案 (MPC) 通常会忽略输入滤波器中的功率纹波。不幸的是，这种电源纹波会导致输出功率和电流纹波。一些方法补偿此电源纹波以获得无纹波输出电流。然而，由于计算和控制负担增加或使用数字滤波器来估计功率纹波，这些方法通常很复杂。此外，电源纹波的补偿会导致电网侧电流畸变，这一问题尚未得到充分解决。本文提出了一种改进的 MPC 方案，可在不平衡电网电压条件下同时补偿输入滤波器电源纹波并减少电网电流失真。电源纹波是根据电网电压及其90电角度延迟信号计算的，无需电网电压分量提取或数字滤波器设计，实现简单。此外，提出了一种闭环电流控制器来减少电网电流的谐波失真。仿真和实验结果证实了所提出的 MPC 方案的可行性。