三相四桥臂逆变器的分序前馈解耦控制的研究

三相三桥臂逆变器一般给三相对称负载供电，针对不对称负载和非线性负栽，我们一般采用三相四桥臂逆变器．采用对称向量法，将三相输出电压和电感电流分解正序分量，负序分量和零序分量，在正序dq坐标系（零序分量在正序幽坐标系下）和负序幽坐标系进行旋转变换，采用前馈解耦对系统进行解耦，在三个dq坐标系下对正序分量，负序分量和零序分量进行独立控制．在matlab／simulink平台下进行仿真，仿真结果证明上述所提方法的正确性，并且优于传统的单同步旋转双闭环控制策略．

Research on Decomposition Sequence and Feedforward Decoupling Control of Three-phase Four-leg Inverter

Three-phase three-leg inverters generally supplies power to the three-phase symmetric loads. For asymmetric and nonlinear loads, we generally use three-phase four-leg inverter. A symmetric vector method adopted in this paper decomposes three-phase output voltage and inductor current into positive, negative and zero sequence component. Then it makes rotating change in the d-q coordinate system of positive and negative sequence. （The zero-sequence component is under positive sequence coordinates）. The forward-feed decouple method adopted is to decouple the control system, and independently regulates the positive, negative and zero sequence component in three d-q coordinate system. It is carried out in matlab / simulink platform simulation and the results prove the correctness of the methods mentioned above. This method is superior to the traditional single svnchronous rotation douhle-loon control strategy.