基于映射方法的二极管箝位多电平逆变器空间矢量调制技术

N. Susheela, P. Kumar, S. K. Sharma
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引用次数: 2

摘要

本文实现了五电平和七电平二极管箝位逆变器(5L-DCMLI和7L-DCMLI)的空间矢量脉宽调制(SVPWM)技术。该技术基于映射方法,其中初始空间向量表示为竞争者向量和误差向量的和。竞争者向量是最接近参考空间向量的向量。通过计算候选矢量与参考矢量的矢量差,得到误差矢量。利用平移方法将误差矢量平移到空间矢量图的原点。对于n级逆变器,在空间矢量图中有(n-1)步长。由于误差矢量的幅值小于空间矢量图的一步,因此可以采用两级空间矢量技术。由此得到的开关状态可以加入到竞争者向量中,得到一个与参考向量非常接近并在时间上跟随参考向量的向量。利用MATLAB/Simulink进行了仿真,给出了5L-DCMLI和7L-DCMLI的SVPWM方法的性能结果。将逆变器连接到感应电机负载上,并对其性能进行评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mapping method based Space Vector Modulation technique for diode clamped multilevel inverters
This paper implements Space Vector Pulse Width Modulation (SVPWM) technique for Five level and Seven level Diode Clamped Inverters (5L-DCMLI and 7L-DCMLI). This technique is based on mapping methods where initially space vector is expressed as sum of a contender vector and an error vector. The contender vector is the one which is nearest to the reference space vector. An error vector is arrived by calculating vector difference of a contender vector from reference vector. The error vector is translated to origin of space vector diagram by using translation methods. For an n-level inverter, there will be (n-1) steps in space vector diagram. Since the amplitude of the error vector will be less than one step of the space vector diagram, two level space vector technique can be applied to it. The switching states thus obtained can be added to contender vector to get a vector which is very close to the reference vector and follows it in time. Simulation is carried out using MATLAB/Simulink and the performance results of SVPWM method of 5L-DCMLI and 7L-DCMLI are presented. The inverter is connected to Induction motor load and performance is evaluated.
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