基于SIMULINK的逆变器并联系统建模与仿真
Modeling and Simulation of Inverter Parallel System Based on SIMULINK
摘要: T型三电平逆变器并联已被广泛应用于扩展系统额定功率，然而当多台逆变器连接到单个直流总线时，将产生零序循环电流。零序环流会使输出电流失真，增加功率损耗并降低效率，对控制策略提出了更高的要求。本文建立了逆变器并联系统的数学模型，改进了传统空间矢量脉宽调制算法，在MATLAB/SIMULINK中进行建模仿真，仿真结果表明该算法具有良好的环流抑制效果，能为实际控制系统数字化打下良好的基础。
Abstract:
Parallel T-type three level inverters have been widely used to expand the rated power of the system. However, when multiple inverters are connected to a single DC bus, the zero sequence circulating current (ZSCC) will be generated. Circulating current inevitably distorts output currents, increases power losses, and reduces the efficiency. This paper introduces the basic working principle of Space Vector Pulse Width Modulation (SVPWM) algorithm in detail, and improves it on the basis of tradition. The simulation is carried out in MATLAB/SIMULINK. The simulation results show that the algorithm has good effect and can lay a good foundation for the actual control system digitization.
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