中文摘要：

针对三电平有源电力滤波器（APP）中点电位不平衡的固有问题,根据其原理及拓扑结构建立了中点电位波动模型,通过对数学模型的理论分析,得出了控制和注入零序电压的方法。为了更好的使理论的方法进行离散化和数字化处理,并且应用到实际的三电平APF实验平台上,提出了“预估-校验-修正”的实时控制算法。实验结果表明,中点电位得到了有效控制,证明了方法正确有效。

英文摘要：

For three-level active power filter（APF） midpoint potential imbalance, the midpoint potential fluctuant model based on theory and topology is established.Through theoretical analysis of mathematical model, obtaining zero-sequence voltage injection control method.In order to make theoretical method digital processing better and apply to the actual experimental platform of three-level APF,proposing ＂forecast-check-fixed＂ real-time control algorithms.Experimental results show that the midpoint potential has been effectively controlled, the method is proved correct and effective.