电容中分式有源电力滤波器双闭环控制策略研究

Research on double closed loops control of mid-point capacitor

建立了电容中分式有源电力滤波器的数学模型,设计其双闭环控制系统,提出了一种改进的控制方案.由包含零序处理环节ip-iq法进行谐波分离,得到指令信号;电流环利用基于拉格朗日二阶外推插值预测k+1时刻电流值,并通过无差拍方式进行控制;直流侧电容采用一个PI控制总体电压平衡,另一个PI控制上下电容电压平衡的双PI均衡控制方式.仿真结果表明,所提方案是正确的、有效的.

A mathematical model of mid-point capacitor active power filter with the double closed loop control system is established and an improved control scheme is proprosed.The ip-iq method which contains zero sequence processing links for harmonic detection is adopted.Based on Lagrange quadratic extrapolation interpolation,current loop predicts given current value of k＋1time,and the system control is realized by deadbeat manner;The balance of overall voltage is regulated by one PI controller in the dc side and the upper and lower capacitor voltage is regulated by another PI controller.The correctness and effectiveness of the control schemes proposed in this paper is verified by the simulation results.