摘要
为解决二极管中点钳位型三电平逆变器直流侧中性点电压不平衡问题,提出了基于60°坐标系的空间矢量脉宽调制算法。该方法采用参考电压矢量标幺变换和扇区旋转模型以简化SVPWM算法;同时根据中性点电流方向和上、下电容电压差,设计PI控制器,调节冗余小矢量作用时间以平衡中性点电压,并在不同调制比下分析了该算法对中性点电压的平衡控制能力。最后利用搭建的Matlab仿真模型和实验平台验证了该算法的有效性。
A space vector pulse width modulation(SVPWM)algorithm based on 60°coordinate system is presented to solve the unbalance of voltage in the DC side of a diode-clamped Three-Level Inverter.The SVPWM algorithm is simplified by the per-unit transformation of the reference voltage vector and the model of sector rotation.The PI controller is designed according to the direction of the mid-point current and the voltage difference between upper and lower capacitor.The action time of redundant small vector is adjusted to balance the mid-point voltage.In addition,the ability of the algorithm to control mid-point voltage at the different modulation ratios is analyzed.The performance of the algorithm is verified through Matlab simulation and experimental platform.
作者
李玥
黄孙伟
徐川
LI Yue;HUANG Sunwei;XU Chuan(School of Electrical Engineering,Tianjin University of Technology,Tianjin 300384,China;Tianjin Key Laboratory for Complicated Control Theory and Application,Tianjin University of Technology,Tianjin 300384,China)
出处
《内蒙古电力技术》
2020年第5期43-48,共6页
Inner Mongolia Electric Power
