三电平直接矩阵变换器的SVPWAM策略
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摘要
三电平直接矩阵变换器(TLDMC)与常规矩阵变换器(MC)相比,能够大幅降低输出波形总谐波畸变率和开关应力;与现有的多电平交-直-交型变换器相比,其在减少开关数量和降低开关损耗方面更具优势。提出了针对TLDMC的空间矢量脉宽幅值调制(SVPWAM)策略,该策略通过消除每个扇区的零矢量,能够降低开关频率,并提高电压利用率。根据TLDMC的拓扑,论证TLDMC的间接调制模型;针对TLDMC的调制,将虚拟整流器由零矢量调制改进为SVPWAM,虚拟逆变器采用虚拟空间矢量脉宽调制(VSVPWM)。仿真和实验结果验证了所提方法的正确性。
Compared with conventional MCs(Matrix Converters),TLDMC(Three-Level Direct Matrix Converter) can reduce the output voltage total harmonic distortion and switching stress. On the other hand,the TLDMC is advantageous to the existing multi-level AC-DC-AC converter in terms of reduced switching count and lowered losses. The SVPWAM(Space Vector Pulse Width Amplitude Modulation) for TLDMC is presented. By eliminating the zero vector of each sector,the switching frequency can be reduced and the voltage transfer ratio can be improved. According to the topology of TLDMC,the indirect space vector modulation is demonstrated. For the modulation of TLDMC,the zero vector modulation of virtual rectifier is improved to SVPWAM,and VSVPWM(Virtual Space Vector Pulse Width Modulation) is employed in the virtual inverters. Finally,simulative and experimental results verify the effectiveness of the proposed approach.
Compared with conventional MCs(Matrix Converters),TLDMC(Three-Level Direct Matrix Converter) can reduce the output voltage total harmonic distortion and switching stress. On the other hand,the TLDMC is advantageous to the existing multi-level AC-DC-AC converter in terms of reduced switching count and lowered losses. The SVPWAM(Space Vector Pulse Width Amplitude Modulation) for TLDMC is presented. By eliminating the zero vector of each sector,the switching frequency can be reduced and the voltage transfer ratio can be improved. According to the topology of TLDMC,the indirect space vector modulation is demonstrated. For the modulation of TLDMC,the zero vector modulation of virtual rectifier is improved to SVPWAM,and VSVPWM(Virtual Space Vector Pulse Width Modulation) is employed in the virtual inverters. Finally,simulative and experimental results verify the effectiveness of the proposed approach.
引文
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[19] 吕建国,吴馥云,胡文斌,等.动态搜索调节调制波偏置的SPWM三电平逆变器中点电压平衡控制方法[J].电力自动化设备,2015,35(12):73-79.Lü Jianguo,WU Fuyun,HU Wenbin,et al.Modulation wave offset adjustment by dynamic search to balance neutral-point voltage of three-level SPWM inverter[J].Electric Power Automation Equipment,2015,35(12):73-79.
[20] 申张亮,郑建勇,梅军.基于改进虚拟空间矢量调制方法的中点箝位型三电平逆变器电容电压平衡问题[J].电力自动化设备,2011,31(3):79-84.SHEN Zhangliang,ZHENG Jianyong,MEI Jun.Capacitor potential balancing of neutral-point clamped three-level inverter based on improved virtual space vector PWM[J].Electric Power Automation Equipment,2011,31(3):79-84.
[2] SUN Y,XIONG W,SU M,et al.Topology and modulation for a new multilevel diode-clamped matrix converter[J].IEEE Transactions on Power Electronics,2014,29(12):6352-6360.
[3] LIE X,CLARE J C,WHEELER P W,et al.Capacitor clamped multilevel matrix converter space vector modulation[J].IEEE Transactions on Industrial Electronics,2012,59(1):105-115.
[4] 李峰,王广柱.模块化多电平矩阵变换器电容电压纹波稳态分析[J].中国电机工程学报,2013,33(24):52-59.LI Feng,WANG Guangzhu.Steady-state analysis of sub-modular capacitor voltage ripple in modular multilevel matrix converters[J].Proceedings of the CSEE,2013,33(24):52-59.
[5] RAJU S,SRIVATVHAN L,CHANDRASEKARAN V,et al.Constant pulse width modulation strategy for direct three-level matrix converter[C]//Proceedings of IEEE International Conference on Power Elec-tronics,Drives and Energy Systems(PEDES).Bengaluru,India:IEEE,2012:16-19.
[6] RAJU S,SRIVATVHAN L,MOHAN N.Direct space vector modu-lated three level matrix converter[C]//Proceedings of 28th Annual IEEE Applied Power Electronics Conference and Exposition(APEC).Long Beach,CA,USA:IEEE,2013:475-481.
[7] 李利娟,朱建林,刘红良.三电平矩阵变换器的电路拓扑与控制策略[J].电力自动化设备,2008,28(3):63-67.LI Lijuan,ZHU Jianlin,LIU Hongliang.Topology and control strategy of three-level matrix converter[J].Electric Power Automation Equipment,2008,28(3):63-67.
[8] 李利娟,汪沨,易灵芝,等.多电平矩阵变换器的等效电路及其应用[J].高电压技术,2013,39(3):741-748.LI Lijuan,WANG Feng,YI Lingzhi,et al.Equivalent circuit and its applications for multilevel matrix converter[J].High Voltage Engineering,2013,39(3):741-748.
[9] ALESINA A,VENTURINI M.Analysis and design of optimum amplitude nine-switch direct AC-AC converters[J].IEEE Transac-tions on Power Electroics,1989,4(1):101-112.
[10] 杨兴华,姜建国.矩阵变换器直接空间矢量调制策略的优化[J].电力自动化设备,2012,32(11):77-82.YANG Xinghua,JIANG Jianguo.Optimization of direct space vector modulation for matrix converter[J].Electric Power Automation Equipment,2012,32(11):77-82.
[11] 王汝田,崔永恒,陈酋峰,等.3×4矩阵变换器的双电压控制策略[J].电力自动化设备,2014,34(12):95-99.WANG Rutian,CUI Yongheng,CHEN Qiufeng,et al.Strategy of double line-to-line voltages control for 3×4 matrix converter[J].Electric Power Automation Equipment,2014,34(12):95-99.
[12] 王汝田,严干贵.矩阵变换器改进的双电压控制策略[J].电力自动化设备,2012,32(2):39-43.WANG Rutian,YAN Gangui.Improved control strategy of double line-to-line voltages for matrix converter[J].Electric Power Automation Equipment,2012,32(2):39-43.
[13] 黄伟,程启明,郭凯,等.两种矩阵变换器的调制策略比较仿真研究[J].电测与仪表,2016,53(3):38-44.HUANG Wei,CHENG Qiming,GUO Kai,et al.The comparison and simulation of modulation strategies for two matrix converters[J].Electrical Measurement & Instrumentation,2016,53(3):38-44.
[14] 张晓锋,夏益辉,乔鸣忠,等.矩阵变换器间接空间矢量逆变级过调制策略优化设计[J].电力自动化设备,2016,36(2):40-44,77.ZHANG Xiaofeng,XIA Yihui,QIAO Mingzhong,et al.Optimal design of indirect space-vector over-modulation strategy for inverter stage of matrix converter[J].Electric Power Automation Equipment,2016,36(2):40-44,77.
[15] 王汝田,王秀云,崔永恒.矩阵变换器的谐波注入PWM控制策略[J].电力自动化设备,2013,33(8):77-82.WANG Rutian,WANG Xiuyun,CUI Yongheng.Harmonic injected PWM control strategy for matrix converter[J].Electric Power Automation Equipment,2013,33(8):77-82.
[16] LEI Q,PENG F Z.Space vector pulse width amplitude modulation for a Buck-Boost voltage/current source inverter[J].IEEE Transactions on Power Electronics,2014,29(1):266-274.
[17] 程启明,徐聪,程尹曼,等.基于DZSI光伏发电系统的SVPWAM策略研究[J].高电压技术,2017,43(1):122-130.CHENG Qiming,XU Cong,CHENG Yinman,et al.Research on SVPWAM strategy of photovoltaic generation system based on DZSI[J].High Voltage Engineering,2017,43(1):122-130.
[18] 唐酿,肖湘宁,盛超,等.矩阵变换器新型间接空间矢量调制算法[J].电工技术学报,2013,28(增刊2):262-269.TANG Niang,XIAO Xiangning,SHENG Chao,et al.Novel algori-thm of matrix converter with indirect space vector modulation[J].Transactions of China Electrotechnical Society,2013,28(Supple-ment 2):262-269.
[19] 吕建国,吴馥云,胡文斌,等.动态搜索调节调制波偏置的SPWM三电平逆变器中点电压平衡控制方法[J].电力自动化设备,2015,35(12):73-79.Lü Jianguo,WU Fuyun,HU Wenbin,et al.Modulation wave offset adjustment by dynamic search to balance neutral-point voltage of three-level SPWM inverter[J].Electric Power Automation Equipment,2015,35(12):73-79.
[20] 申张亮,郑建勇,梅军.基于改进虚拟空间矢量调制方法的中点箝位型三电平逆变器电容电压平衡问题[J].电力自动化设备,2011,31(3):79-84.SHEN Zhangliang,ZHENG Jianyong,MEI Jun.Capacitor potential balancing of neutral-point clamped three-level inverter based on improved virtual space vector PWM[J].Electric Power Automation Equipment,2011,31(3):79-84.