基于无差拍控制的三电平有源滤波器研究

文章以二极管箝位型三电平有源滤波器为研究对象，详细推导了该三电平有源滤波系统在abc坐标系下与dq坐标系下的数学模型：阐述了无差拍控制原理，并构建重复预测型观测器，对指令电流进行预测，改善了系统的控制效果；采用改进型主动平衡因子法，预测直流侧中点电荷的变化趋势，控制直流侧中点电位平衡。仿真验证了该有源滤波系统性能良好。

Research on Three-level APF Based on Deadbeat Control

Taking the diode neutral-point-clamped three-level active power filter （APF） as the researching target, this paper has thoroughly derived mathematical models of the three-level APF in the context of abc coordinate and dq coordinate respectively. The principle of deadbeat control is expounded in detail and a repetitive predictor is built to predict the instruction current, which improves the controlling performance. The improved active balancing factor method is adopted to predict the changing tendency of neutral-point load in DC-side, thus maintaining the balance of the DC-side neutral point. Simulation results have verified the satisfactory performance of the proposed approach.