基于改进虚拟矢量开关序列的NPC三电平整流器有限集预测控制  

Finite control set predictive control of NPC three⁃level rectifier based on improved virtual vector switching sequence

作　　者：石洁 牛小兵 马琦雯 周鑫 SHI Jie;NIU Xiaobing;MA Qiwen;ZHOU Xin(Marine Electrical Engineering College,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学船舶电气工程学院,辽宁大连116026

出　　处：《大连海事大学学报》2024年第3期49-57,共9页Journal of Dalian Maritime University

摘　　要：针对中点箝位型三电平整流器直流侧中点电位不平衡问题,提出一种基于改进虚拟空间矢量的有限集模型预测控制(IVSV⁃FCSMPC)策略。首先,以多矢量合成为基础,依据虚拟空间矢量不会造成中点电位波动的特性,构建基于电流跟踪控制的单目标价值函数,实现无权重系数型预测控制;其次,设计基于中点电位反馈的动态调节因子,调节矢量合成过程中的正负小矢量和中矢量作用时间,在低调制度的小扇区范围内同时调节两对冗余小矢量,在无冗余矢量作用的高调制度小扇区范围内通过改进虚拟中矢量抑制中点电位波动,优化虚拟空间矢量开关序列,实现全调制度范围内的中点电位平衡精确控制;最后,基于三电平整流器硬件平台进行实验验证。结果表明,本文设计的控制算法具有良好的电流跟踪控制性能,中点电位平衡控制效果优异且响应速度较快。A finite control set model predictive control strategy based on the improved virtual space vector(IVSV⁃FCSMPC)was proposed for DC side midpoint potential imbalance problem of midpoint⁃clamped three⁃level rectifiers.Firstly,based on multi vector synthesis and the characteristic that virtual space vectors do not cause midpoint potential fluctuations,a single objective value function based on current tracking control was constructed to achieve unweighted coefficient based predictive control.Secondly,a dynamic adjustment factor based on midpoint potential feedback was designed to adjust the action time of positive and negative small vectors and medium vectors in the vector synthesis process.Two pairs of redundant small vectors were simultaneously adjusted within the small sector range of the low modulation regime.In the small sector range of the high modulation regime without redundant vector action,the virtual space vector switch sequence was optimized by improving the virtual medium vector to suppress midpoint potential fluctuations,achieving precise control of midpoint potential balance within the full modulation regime range.Finally,the experimental verification was carried out based on the hardware platform of the threelevel rectifier.Results show that the designed control method has good current tracking control performance,excellent midpoint potential bal⁃ance control and fast response speed.

关 键 词：NPC三电平整流器 中点电位波动 开关序列优化 动态调节因子 有限集模型预测控制 

分 类 号：TM461[电气工程—电器]