三电平有源电力滤波器谐波电流跟踪无差控制方法  

Novel Control Algorithm of Tracking Harmonic Current with Little Static Misadjustment for Active Power Filter with Three-Level NPC Inverter

作　　者：何英杰[1] 刘进军[1] 王兆安[1] 邹云屏[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《西安交通大学学报》2009年第8期90-94,共5页Journal of Xi'an Jiaotong University

基　　金：国家科技支撑计划资助项目(2007BAA12B03);中国博士后基金特别资助项目(200801429);中国博士后科学基金资助项目(20070421112)

摘　　要：为了提高三电平有源电力滤波器(APF)的谐波抑制能力,对其闭环控制系统进行研究发现,跟踪参考谐波电流的控制方法是决定三电平APF补偿质量的关键.分析了传统电流状态反馈解耦PI调节器的局限性,提出一种新型PI控制方法.在该方法中,采用状态观测器,对APF下一拍输出电流进行估计,弥补了数字控制系统一个载波周期的延时.采用重复预测型观测器,对指令谐波电流进行预测,具有动态响应快、且稳定后无静差的特性,因而改善了整个系统的控制效果.基于该控制方法进行了实验研究,从实验结果可以看出,加入该PI控制器后,系统电流的正弦性大大提高,突加负载和突减负载时,滤波系统能瞬时跟踪负载变化,有很好的动态响应速度.To improve the overall performance of the three-level active power filter（APF）, the closed-loop control system of this APF is investigated, and it is found that tracking command harmonic current is one of the keys to designing this APF. The current state feedback decoupling PI control is analyzed in detail and the limitation of the conventional PI conditioner in the traditional strategies, a novel PI control method is proposed, where the predictive output current value is obtained by the state predictor, and the delay of one sampling period is remedied in this digital control system by the state predictor. The predictive command harmonic current value is obtained by the repetitive predictor synchronously with higher dynamic convergence rate and little static misadjustment. The experiment results demonstrate the steady filtering capability.

关 键 词：有源电力滤波器 三电平变流器 PI控制 观测器 

分 类 号：TM761[电气工程—电力系统及自动化]