计及负载特性的三相四桥臂逆变控制技术研究

Research on Three-phase Four-leg Inverter Control Technology With Load Characteristics

针对不平衡、非线性负载大量存在且日益增多的现状,对近年来发展迅速、有潜力成为未来主流拓扑的三相四桥臂逆变器控制技术进行了研究,提出了一种基于不平衡、非线性负载的三相四桥臂逆变控制策略。首先分析了三相四桥臂逆变器的不平衡负载抑制机理,然后基于对三维空间矢量调制(3DSVM)技术在α,β,γ/a,b,c坐标系下控制原理的分析,结合d,q,0坐标系对逆变器三相输出电压的解耦、重复控制,实现了不平衡、非线性负载条件下三相四桥臂逆变器三相电压的对称输出,同时有效抑制了其中的直流分量、谐波。通过仿真分析并构造典型负载进行实验,验证了策略的可行性和有效性。

Due to the substantial existence and increase of unbalanced and non-linear loads,research is conducted on three-phase four-leg inverter control technology which develops rapidly in recent years and has the potential to become the future mainstream topology.A control strategy of three-phase four-leg inverter under unbalanced and non-linear loading conditions is proposed.Firstly,the suppression mechanism of unbalanced loads for three-phase four-leg inverter is analyzed.Then,based on the analysis of three dimensional space vector modulation(3 DSVM)control principles in α,β,γ/a,b,c coordinate systems,Combine decoupling and repetitive control on the three-phase output voltage in coordinate system d,q,0 symmetrical output of three-phase voltage of three-phase four-leg inverter under unbalanced and nonlinear loading conditions is achieved.And direct current components and harmonic therein are effectively suppressed.Feasibility and effectiveness of the strategy are verified through the simulation analysis and experiment.