一种高调制比单电阻采样三相电流重构策略  

A Strategy of Three-phase Current Reconstruction for Single Resistor Sampling with High Modulation Ratio

作　　者：胡亚山 汪涛 刘理 劳振图 HU Yashan;WANG Tao;LIU Li;LAO Zhentu(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2024年第10期145-153,共9页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(2023JJ30133)。

摘　　要：为了减小空间电压矢量合成区域内的电流不可观测区域,提升输出电压调制比,提出一种高调制比单电阻采样三相电流重构策略.该策略根据开关状态和实际硬件采样延时的不同将开关状态相移过程分为3个阶段,分别进行不同开关状态相移处理,在不改变原有电路拓扑的情况下提升了输出电压调制比.该策略在一个脉宽调制(Pulse Width Modulation,PWM)周期的前半周期内完成电流采样,后半周期实现电流重构,而且能充分利用零矢量的导通时间,减小电流不可观测区域,实现三相电流的完整重构.仿真和实验验证了该策略的可行性和有效性.To reduce the current unobservable region within the spatial voltage vector synthesis region and increase the output voltage modulation ratio,a strategy of three-phase current reconstruction for single resistor sampling with high modulation ratio is proposed.The switching state phase shift process is divided into three stages according to the difference between the switching state and actual hardware sampling delay,and the process with difference switches is carried out,which increases the output voltage modulation ratio without any modification of the original circuit topology.The currents are sampled during the first half Pulse Width Modulation(PWM)period and reconstructed in the second half PWM period.Meanwhile,it fully utilizes the turn-on time of the zero vector,reduces the unobservable area,and realizes the complete reconstruction of the three-phase current.Finally,the feasibility and effectiveness of the strategy are verified by simulations and experiments.

关 键 词：三相电流重构 单电阻采样 开关状态相移 电压调制比 脉宽调制 

分 类 号：TM464[电气工程—电器]