带LCL滤波的基于状态空间控制的有源滤波器  

The active filter with LCL filtering based on state-space control

作　　者：郑成伟 胡金高[1] Zheng Chengwei;Hu Jin’gao(Fuzhou University,Fuzhou 350108)

机构地区：[1]福州大学,福州350108

出　　处：《电气技术》2018年第8期16-21,共6页Electrical Engineering

基　　金：福建省自然科学基金(2017J01747)

摘　　要：并联有源电力滤波器(SAPF)是一个典型的电流跟踪控制系统。在APF系统中引入LCL型输出滤波器对开关谐波有良好的衰减效果,但易发生谐振。本文探索了一种对补偿电流的快速跟踪及抑制谐振问题的新型控制方法。在同步旋转坐标系下进行复数形式下建立状态空间模型,可使有功无功解耦控制,且可直接分离获得谐波电流,实现APF系统由谐波检测和补偿控制两个环节的一体化;利用观测值反馈,通过状态反馈极点的配置,来改善系统的动态响应和稳定性,实现抑制谐振及减少阻尼损耗。在控制器设计中还综合了母线电压稳定和电网电压前馈环节。最后给出一些仿真结果,验证了该设计的有效性。Shunt active power filter is a typical current tracking control system.The output LCL filter used in APF has a good damping effect to switch harmonics,but is prone to resonance.This article explores a new control method for fast tracking of compensation current and suppressing resonance.The complex form of state-space model is first established in the synchronous rotating d_q coordinate,which can make the active and reactive power components decoupled,and at the same time the harmonic current can be directly extracted,thus the harmonic detection and compensation control in the APF system are unified in the same realization.Using the observer-based feedback,the dynamic response and stability of the system can be improved through pole placement in state feedback,while effectively suppressing resonance and reducing the damping loss.Also incorporated into the main controller design are the stabilization of the DC-link voltage and the feed-forward compensation of grid voltages.Finally some simulation results are given to verify the effectiveness of the design.

关 键 词：有源电力滤波器 LCL滤波器 状态反馈 降阶观测器 前馈补偿 

分 类 号：TN713.8[电子电信—电路与系统]