基于三相四桥臂的不均衡负载逆变仿真分析  

Simulation Analysis of Unbalanced Load Inverter Based on Three-phase Four Leg

作　　者：豆童童 邱楠 孔德贺 DOU Tongtong;QIU Nan;KONG Dehe(School of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学机车车辆工程学院,辽宁大连116028

出　　处：《电工技术》2022年第20期175-178,共4页Electric Engineering

摘　　要：三相逆变器在较重的不平衡负载影响下输出的电压波形会畸变。基于三相四桥臂逆变器给出了解决这一问题的控制策略。使用90°对称分量法对各序电压进行分解,分解后的正序与负序分量使用双闭环PI方法进行控制,零序分量则采用虚拟构造αβ坐标系进行控制,最后用三维空间电压矢量调制算法(3D-SVPWM)产生控制脉冲驱动四桥臂逆变器。仿真结果证实了控制策略的有效性,三相四桥臂逆变器在带三相不平衡负载的情况下输出也是均衡的。The output voltage waveform of three-phase inverter will be distorted under the influence of heavy unbalanced load.This paper presents a control strategy to solve this problem based on three-phase four leg inverter.The 90 degree symmetrical component method is used to decompose each sequence voltage,the decomposed positive sequence and negative sequence components are controlled by double closed-loop PI method,and the zero sequence component is constructed by virtual structureα-βFinally,the four leg inverter is driven by the control pulse generated by the three-dimensional space voltage vector modulation algorithm(3D-SVPWM).The simulation results confirm the effectiveness of the control strategy,and the output of the three-phase four leg inverter is balanced under the condition of three-phase unbalanced load.

关 键 词：三相四桥臂逆变器 三相不平衡负载 PI控制器 3D-SVPWM 

分 类 号：TM721[电气工程—电力系统及自动化]