四桥臂三相逆变电源的三维空间矢量控制技术研究

介绍了四桥臂三相逆变器的三维空间矢量控制原理,给出了任意负载下空间矢量的运动轨迹表达式,建立了三维空间矢量调制四桥臂逆变器MATLAB模型,并利用MATLAB仿真软件对各种性质负载,对称和不对称负载及负载和输入电压突变情况进行了仿真研究.研究结果表明该法具有负载适应能力及带不对称负载能力强、系统稳定性好、结构简单等优点,并在DSP实验平台上进行了初步的实验验证,证明该法是可行的.

Study of Space Vector Modulation of Four-Legged Three-Phase Inverter

In this paper, an effective control strategy of four-legged three-phase inverter, three-dimensional space vector modulation (3D-SVM), is presented. The principle of 3D-SVM technique is introduced, and the moving locus expression of space vector suited for various kinds of linear load is given. The MATLAB simulation model of the inverter is built up,amounts of simulations are done under different conditions including stability and dynamic condition. The results show that 3D-SVM technique used in four-legged three-phase inverter has great advantages such as lower input dc voltage needed, stronger adaptability of load, and extreme stability of system. The experimental results under open-loop on digital-controlled inverter system consisted by DSP show feasibility of this control strategy.