考虑电流过零畸变的Vienna整流器SPWM调制策略研究  

Study on SPWM Modulation Strategy for Vienna Rectifier Considering Current Zero-crossing Distortion

作　　者：崔霆龙 杨树德 司舒洁 姚嘉懿 张新闻[2] CUI Ting-long;YANG Shu-de;SI Shu-jie;YAO Jia-yi;ZHANG Xin-wen(College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225000,China;School of Electrical and Information Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]扬州大学电气与能源动力工程学院,江苏扬州225000 [2]北方民族大学电气信息工程学院,宁夏银川750021

出　　处：《山东工业技术》2024年第4期3-9,共7页Journal of Shandong Industrial Technology

基　　金：国家自然科学基金项目(52367018);教育部产学合作协同育人项目(220503879260230)。

摘　　要：空间矢量脉宽调制(space vector pulse width modulation,SVPWM)在Vienna整流器控制中应用广泛。然而,SVPWM的计算量较大,难以应用在开关频率较高的Vienna整流器控制中,且Vienna整流器功率只能单向传递的特点使得输出电流易出现过零畸变。针对上述问题,本文首先给出了正常状态下Vienna整流器正弦脉宽调制(sinusoidal pulse width modulation,SPWM)过程中期望输出电压与PWM比较值之间的关系表达式,并进一步分析了电流过零畸变的机理。基于误差最小化思想,本文提出了一种考虑电流过零畸变的Vienna整流器SPWM调制策略。仿真实验表明:采用考虑电流过零畸变的Vienna整流器SPWM调制策略,可显著减小电流过零畸变,提高电流质量,与未采用本调制策略相比,并网电流的THD由2.48%减小至1.1%。Space vector pulse width modulation(SVPWM)is widely used in Vienna rectifier control;however,the calcula-tion amount of SVPWM is large,which makes it difficult to implement in the high switching frequency control of Vienna rectifier.Besides,the unidirectional power transmission characteristic of the Vienna rectifier may easi-ly cause zero-crossing distortion in the output current.To address the above issues,firstly,the relational expres-sion between the expected output voltage and the PWM comparison value during the sinusoidal pulse width modulation(SPWM)process of the Vienna rectifier under normal conditions is given in this paper.Further,the mechanism of current zero-crossing distortion is analyzed.Afterwards,a SPWM modulation strategy for Vienna rectifier considering current zero-crossing distortion is proposed based on the idea of minimizing errors.The simulation experiments show that the SPWM modulation strategy for Vienna rectifier considering current zero-crossing distortion can significantly reduce the current zero-crossing distortion and improve current quality.The THD of grid-connected current can be reduced from 2.48%to 1.1%after the proposed modulation strategy is applied.

关 键 词：VIENNA整流器 正弦脉宽调制 调制策略 过零畸变 总谐波畸变率 

分 类 号：TM46[电气工程—电器]