基于三维空间矢量中γ分量控制的三相四桥臂逆变器  

Three-phase four-leg inverter based on γ component controlin three-dimensional space vector

作　　者：张晓勇[1] 王军[1] 李川[1] 王英[1] 

机构地区：[1]西华大学电气信息学院,四川成都610039

出　　处：《电力自动化设备》2010年第12期70-73,87,共5页Electric Power Automation Equipment

基　　金：四川省重点学科基金资助项目(SZD0503-09-0);四川省教育厅重点项目基金资助项目(07ZA108;09ZA112)~~

摘　　要：提出了一种性能优良、设计简单的三相四桥臂控制器及其设计方法,该方法通过对三相输出电压的静止坐标变换,在各种线性与非线性、平衡与不平衡负载的分析比较中,得出了γ分量是影响三相输出电压不平衡的关键因素;通过分析四桥臂逆变器的控制规律和研究第4桥臂的作用,前3个桥臂由二维空间矢量控制,第4桥臂通过γ分量的控制对负载产生的不平衡进行全补偿,使得在三相不平衡负载下,输出的三相电压达到一个平衡状态。仿真结果验证了该方法的可行性;与现有的方法相比,三相电压和电流中谐波含量显著减少。A three-phase four-leg controller with excellent performance and simple design is proposed. Thecomparison of output voltage vectors among linear,non-linear,balanced and unbalanced loads shows that theγ component is the key influencing factor on the unbalance of three-phase output voltage. According to thecontrol law of four-leg inverter and the function of its fourth leg,the proposed design method is to controlthree legs by two-dimensional space vector modulation and the fourth leg by γ component,whichcompensates completely the unbalance caused by unbalanced loads. Simulative results validate the feasibilityof the proposed method. Compared with the existing method,the harmonic components of three-phase outputcurrents and voltages are significantly reduced.

关 键 词：三相四桥臂逆变器 空间矢量调制 不平衡和非线性负载 脉宽调制 

分 类 号：TM464[电气工程—电器]