新型准Z源三电平逆变器的性能分析及其并网控制特性
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摘要
针对传统Z源逆变器起动冲击电流大,升压能力不足,电容电压应力大等局限性,提出了一种准Z源中性点钳位式(neutral point clamped, NPC)三电平逆变器拓扑结构。首先,分析了所提结构的工作原理及其准Z源参数的设计,在低直通占空比情况下,实现了较高逆变器电压输出,优化了电能质量,降低了准Z源网络的电容电压;其次,引入了简化PQ控制策略,实现了单位功率因数并网,电流谐波畸变率低;最后,经过Simulink软件和实验硬件研究,验证了新型准Z源三电平逆变器的优越性及其并网控制策略的有效性。
Aiming at the limitation that the traditional Z-source inverter has large starting impulse current insufficient boosting ability, and large capacitance voltage stress, a quasi-Z source neutral point clamped(NPC) three-level inverse topology is proposed. Firstly, the working principle of the proposed structure and the design of the quasi-Z source parameters are analyzed, the inverter can achieve higher voltage output at low shoot-through duty ratio, which optimizes the power quality and reduces quasi-Z source network capacitor voltage. Secondly, simplified PQ control strategy is introduced to achieve unit power factor grid connection, and current harmonic distortion rate is reduced. Finally, through the simulink software and experimental hardware research, the superiority of the new quasi-Z source three-level inverter and the effectiveness of the grid-connected control strategy are verified.
Aiming at the limitation that the traditional Z-source inverter has large starting impulse current insufficient boosting ability, and large capacitance voltage stress, a quasi-Z source neutral point clamped(NPC) three-level inverse topology is proposed. Firstly, the working principle of the proposed structure and the design of the quasi-Z source parameters are analyzed, the inverter can achieve higher voltage output at low shoot-through duty ratio, which optimizes the power quality and reduces quasi-Z source network capacitor voltage. Secondly, simplified PQ control strategy is introduced to achieve unit power factor grid connection, and current harmonic distortion rate is reduced. Finally, through the simulink software and experimental hardware research, the superiority of the new quasi-Z source three-level inverter and the effectiveness of the grid-connected control strategy are verified.
引文
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[14] 贺昱耀,冯伟,宋石磊.Z源级联三电平中点钳位逆变器[J].电网技术,2012,36(4):219-224.HE Yuyao,FENG Wei,SONG Shilei.A cascaded Z-source three-level neutral point clamped inverter [J].Power System Technology,2012,36(4):219-224.
[15] ZAKIS J,HUSEV O,STRZELECKI R.Feasibility study of inductor coupling in three-level neutral-point-clamped quasi-Z-source DC/AC converter [C]//2014 Electric Power Quality and Supply Reliability Conference (PQ),June 11-13,2014,Rakvere,Estonia.New York:IEEE,2014:273-276.
[16] 王建伟,胡晓光,陈松松,等.具有谐波补偿功能的动态电压恢复器控制策略[J].电网技术,2013,37(6):1700-1705.WANG Jianwei,HU Xiaoguang,CHEN Songsong,et al.A control strategy for dynamic voltage restorer with harmonic compensation function [J].Power System Technology,2013,37(6):1700-1705.
[17] 李小叶,李永丽,张玮亚,等.基于多功能并网逆变器的电能质量控制策略[J].电网技术,2015,39(2):556-561.LI Xiaoye,LI Yongli,ZHANG Weiya,et al.Power quality control strategy based on multi-function grid-connected inverter [J].Power System Technology,2015,39(2):556-561.
[18] 靳伟,李永丽,卜立之,等.基于CPT理论和重复控制的多功能并网逆变器研究[J].电工技术学报,2018,33(18):556-562.JIN Wei,LI Yongli,BU Lizhi,et al.Research on multi-function grid-connected inverter based on CPT theory and repeated control [J].Transactions of China Electrotechnical Society,2018,33(18):556-562.
[19] 余德清,程启明,高杰,等.降电容电压型准Z源三电平逆变器及其恒功率并网控制[J].高电压技术,2018,44(4):1319-1327.YU Deqing,CHENG Qiming,GAO Jie,et al.Quasi Z-source three-level inverter with reduced capacitor voltage and its constant power grid-connected control [J].High Voltage Technology,2018,44(4):1319-1327.
[2] RAJAKARUNA S,JAYAWICKRAMA L.Steady-state analysis and designing impedance network of Z-source inverters [J].IEEE Transactions on Industrial Electronics,2010,57(7):2483-2491.
[3] VINNIKOV D,ROASTO I.Quasi-Z-source-based isolated DC/DC converters for distributed power generation [J].IEEE Transactions on Industrial Electronics,2011,58(1):192-201.
[4] ABDELHAKIM A,DAVARI P,BLAABJERG F,et.al.Switching loss reduction in the three-phase quasi-Z-source inverters utilizing modified space vector modulation strategies [J].IEEE Transactions on Power Electronics,2018,33(5):4045-4060.
[5] 汤雨,谢少军,张超华.改进型Z源逆变器[J].中国电机工程学报,2009,29(30):28-34.TANG Yu,XIE Shaojun,ZHANG Chaohua.Improved Z-source inverter [J].Proceedings of the CSEE,2009,29(30):28-34.
[6] 蔡春伟,曲延滨,盛况.增强型Z源逆变器[J].中国电机工程学报[J].2011,31(S1):259-266.CAI Chunwei,QU Yanbin,SHENG Kuang,et al.Enhanced Z-source inverter [J].Proceedings of the CSEE,2011,31(S1):259-266.
[7] 侯世英,肖旭,张闯,等.改进型Z源逆变器[J].电力自动化设备,2011,31(8):24-28.HOU Shiying,XIAO Xu,ZHANG Chuang,et al.Improved Z source inverter [J].Electric Power Automation Equipment,2011,31(8):24-28.
[8] 周玉斐,黄文新,赵健伍,等.一种高升压比的Z源逆变器[J].电工技术学报,2013,28(9):239-246.ZHOU Yufei,HUANG Wenxin,ZHAO Jianwu,et al.A high gain Z-source inverter [J].Transactions of China Electrotechnical Society,2013,28(9):239-246.
[9] 张瑾,齐铂金.Z源三电平中点钳位逆变器中点电位平衡控制方法[J].中国电机工程学报,2010,30(12):7-13.ZHANG Jin,QI Bojin.Neutral-point potential balancing method for Z-source three-level NPC inverters [J].Proceedings of the CSEE,2010,30(12):7-13.
[10] 赵健伍,黄文新,周玉斐,等.带抽头电感的准Z源逆变器建模与特性分析[J].电工技术学报,2014,29(6):7-16.ZHAO Jianwu,HUANG Wenxin,ZHOU Yufei,et al.Modeling and analysis of tapped-inductor quasi-Z-source inverter [J].Transactions of China Electrotechnical Society,2014,29(6):7-16.
[11] ZHU M,YU K,LUO F L.Switched inductor Z-source inverter [J].IEEE Transactions on Power Electronics,2010,25(8):2150-2158.
[12] POH C L,FENG G,FREDE B.Topological and modulation design of three-level Z-source inverters [J].IEEE Transactions on Power Electronics,2008,23(5):2268-2277.
[13] RONCERO-SANCHEZ P,RONCERO-CLEMENTE C,ROMERO-CADAVAL E,et al.Control scheme of a three-phase three-level NPC Z-source inverter with LCL filter for RES applications [C]//IECON 2016-42nd Annual Conference of the IEEE Industrial Electronics Society,October 23-26,2016,Florence,Italy.New York:IEEE,2016:6540-6547.
[14] 贺昱耀,冯伟,宋石磊.Z源级联三电平中点钳位逆变器[J].电网技术,2012,36(4):219-224.HE Yuyao,FENG Wei,SONG Shilei.A cascaded Z-source three-level neutral point clamped inverter [J].Power System Technology,2012,36(4):219-224.
[15] ZAKIS J,HUSEV O,STRZELECKI R.Feasibility study of inductor coupling in three-level neutral-point-clamped quasi-Z-source DC/AC converter [C]//2014 Electric Power Quality and Supply Reliability Conference (PQ),June 11-13,2014,Rakvere,Estonia.New York:IEEE,2014:273-276.
[16] 王建伟,胡晓光,陈松松,等.具有谐波补偿功能的动态电压恢复器控制策略[J].电网技术,2013,37(6):1700-1705.WANG Jianwei,HU Xiaoguang,CHEN Songsong,et al.A control strategy for dynamic voltage restorer with harmonic compensation function [J].Power System Technology,2013,37(6):1700-1705.
[17] 李小叶,李永丽,张玮亚,等.基于多功能并网逆变器的电能质量控制策略[J].电网技术,2015,39(2):556-561.LI Xiaoye,LI Yongli,ZHANG Weiya,et al.Power quality control strategy based on multi-function grid-connected inverter [J].Power System Technology,2015,39(2):556-561.
[18] 靳伟,李永丽,卜立之,等.基于CPT理论和重复控制的多功能并网逆变器研究[J].电工技术学报,2018,33(18):556-562.JIN Wei,LI Yongli,BU Lizhi,et al.Research on multi-function grid-connected inverter based on CPT theory and repeated control [J].Transactions of China Electrotechnical Society,2018,33(18):556-562.
[19] 余德清,程启明,高杰,等.降电容电压型准Z源三电平逆变器及其恒功率并网控制[J].高电压技术,2018,44(4):1319-1327.YU Deqing,CHENG Qiming,GAO Jie,et al.Quasi Z-source three-level inverter with reduced capacitor voltage and its constant power grid-connected control [J].High Voltage Technology,2018,44(4):1319-1327.
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