基于H_∞重复控制的三相四桥臂逆变器研究  

Research on the three-phase four-leg inverter based on H_∞ repetitive control

作　　者：闫士杰[1] 冷冰[1] 杜蘅[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《电机与控制学报》2012年第9期39-47,共9页Electric Machines and Control

基　　金：辽宁省自然科学基金(20102068)

摘　　要：为了解决微型电网中,作为功率接口的三相四桥臂逆变器存在输出波形畸变率大,跟踪给定正弦波慢的问题。在三相四桥臂逆变器解耦成三个单相逆变器的基础上,提出了一种H∞重复控制策略。首先依据内模控制原理,对每个单相逆变器建立了包含输出滤波器的逆变器系统模型,设计了重复控制的电压控制器。然后基于H∞控制原理,加入了稳定补偿器,以保证H∞最优性能。这就使逆变器的输出波形快速跟踪参考正弦波,逆变器输出电压畸变率明显小于常规控制方法。仿真和实验结果表明,不论在负载突变等大干扰情况下,还是在负载不平衡或者非线性的情况下,逆变器都能够保持完好的电压输出特性和良好的动态特性。Three-phase four-leg inverter as power interface in micro-grid had problems that the harmonic distortion of the output voltage was high and the wave tracking of the output voltage was slow.In order to solve these problems,an H∞ repetitive control strategy was proposed based on the three-phase four-leg inverter being decoupled into three single-phase inverters.Firstly,an inverter system model with an output filter was established and a voltage controller of repetitive control was designed based on internal model control theory for each single-phase inverter.Then according to H∞ control theory,a stable compensator was added into system to ensure optimum H∞ performance.This led to inverter output tracking reference sinusoidal waveform rapidly and a lower harmonic distortion than the conventional control methods.The results of simulation and experiment show that the inverter voltage output characteristics and dynamic characteristics are excellent,under conditions of the load varying suddenly and in the case of an imbalance load or nonlinear.

关 键 词：三相四桥臂逆变器 单相逆变器 H∞重复控制 解耦控制 稳定补偿器 

分 类 号：TM464[电气工程—电器]