考虑数字化控制离散性的三电平低调制比区域窄脉冲抑制策略  

Narrow Pulse Suppression Strategy of Three-Level Converter Considering Digital Control Discreteness in Low Modulation Index Region

作　　者：陈凯 温旭辉[1,2] 李文善 张剑[1,2] 沈琳 Chen Kai;Wen Xuhui;Li Wenshan;Zhang Jian;Shen Lin(Key Laboratory of High Density Electromagnetic Power and Systems Institute of Electrical Engineering Chinese Academy of Sciences,Beijing 100190 China;University of Chinese Academy of Sciences,Beijing 100049 China)

机构地区：[1]高密度电磁动力与系统重点实验室(中国科学院电工研究所),北京100190 [2]中国科学院大学,北京100049

出　　处：《电工技术学报》2025年第8期2587-2600,共14页Transactions of China Electrotechnical Society

摘　　要：永磁同步电机拖动大惯量飞轮充能过程,三电平变流器长时间处于低调制比状态,经典虚拟空间矢量调制策略会频繁出现窄脉冲,进而导致电压电流波形畸变、功率器件损坏以及电机起动瞬间中点电位失控等问题。针对以上问题,该文提出考虑永磁同步电机控制离散性的窄脉冲分析方法,定量分析经典虚拟空间矢量调制算法在低调制比区域的窄脉冲分布规律。在此基础上,提出一种基于矢量序列优化的混合虚拟空间矢量调制策略,实现了三电平变流器低调制比区域窄脉冲抑制。仿真和实验结果表明,该方法不仅有效抑制了窄脉冲、改善电流波形质量,也降低了三电平变流器开关动作次数,解决了电机起动瞬间中点电位失控的问题。During the charging process of flywheel driving by permanent magnet synchronous motor,the three-level converter operates in a low modulation index for a long time,and the traditional virtual space vector pulse width modulation(VSVPWM)strategy frequently generates narrow pulses.Due to the discrete nature of digital control,the sector boundaries in the traditional VSVPWM strategy can shift,exacerbating the narrow pulse issue.These narrow pulses lead to significant distortion in the voltage and current waveforms of the converter and even damage the power devices.This paper proposed an analysis method considering the discreteness of motor digital control and a hybrid VSVPWM strategy based on vector sequence optimization.Firstly,the variation characteristics of the voltage reference vector and its influence on sector boundary under digital control were studied based on the steady-state mathematical model of the motor.Then,the minimum pulse width function was established to quantitatively analyze the distribution of narrow pulses in the traditional VSVPWM within the low modulation index region.Consequently,according to the narrow pulse distribution law,a hybrid VSVPWM strategy based on vector sequence optimization was proposed.The traditional VSVPWM(Seg9_VSVPWM),the thirteen-segment VSVPWM(Seg13_VSVPWM),and the proposed hybrid VSVPWM(LH_VSVPWM)were compared.The simulation results show that when the modulation index is 0.1 and 0.3,Seg9_VSVPWM continuously presents narrow pulses less than 2μs at the boundary between sectors F and A with 672 and 219 times within 1 s.When the modulation index is 0.5,Seg13_VSVPWM would produce the narrowest pulses and accumulate 1102 times within 1s.However,when the modulation index is 0.1,the proposed LH_VSVPWM eliminates the narrow pulse by optimizing the vector sequence.In addition,LH_VSVPWM has the fewest switching action times in the modulation index of 0.3 and 0.5,which is 5836 and 5875 times in 1s,respectively.Meanwhile,the proposed strategy performs well in limiting narrow pulses,o

关 键 词：数字化电机控制 三电平变流器 低调制比 窄脉冲 中点电位平衡 虚拟空间矢量调制 

分 类 号：TM464[电气工程—电器]