采用辅助变压器的全占空比调节三电平AC/AC变换器
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摘要
高压大功率变换场合下,传统三电平AC/AC变换器需要同时控制输出电压和飞跨电容电压,使得控制电路相对复杂,且输出电压和负载范围受到限制。为此提出了一种采用辅助变压器的全占空比调节三电平AC/AC变换器,其飞跨电容电压由辅助变压器直接供给,无需通过其他控制电路进行调节。该变换器只有输出电压1个控制对象,其控制简单、易于实现,可全占空比满幅调节输出电压,且辅助变压器的容量很小,只需略大于飞跨电容的无功负载。详细分析了电路工作原理,并研制了原理样机。实验结果表明,采用简单的控制电路就可实现三电平AC/AC变换器的全占空比满幅调节。
For high voltage and high power conversion applications,the traditional three-level AC/AC converter needs to control the output voltage as well as the flying capacitor voltage,which makes the control circuit relatively complicated and the ranges of output voltage and load limited. A full-duty-cycle three-level AC/AC converter with an auxiliary transformer is proposed. The voltage of the flying capacitor is directly supplied by the auxiliary transformer and does not need to be controlled by other control circuits. The proposed converter only controls the output voltage. Its control strategy is simple and easy to be realized. The output voltage can be adjusted with full-duty-cycle. The capacity of auxiliary transformer is very small which only needs to supply the reactive load of the flying capacitor. The operation principle of the circuit is analyzed in detail,and a prototype is designed. The experimental results show that the full-duty-cycle regulation of three-level AC/AC converter can be realized with a simple control circuit.
For high voltage and high power conversion applications,the traditional three-level AC/AC converter needs to control the output voltage as well as the flying capacitor voltage,which makes the control circuit relatively complicated and the ranges of output voltage and load limited. A full-duty-cycle three-level AC/AC converter with an auxiliary transformer is proposed. The voltage of the flying capacitor is directly supplied by the auxiliary transformer and does not need to be controlled by other control circuits. The proposed converter only controls the output voltage. Its control strategy is simple and easy to be realized. The output voltage can be adjusted with full-duty-cycle. The capacity of auxiliary transformer is very small which only needs to supply the reactive load of the flying capacitor. The operation principle of the circuit is analyzed in detail,and a prototype is designed. The experimental results show that the full-duty-cycle regulation of three-level AC/AC converter can be realized with a simple control circuit.
引文
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[15] 陈可,张友军.Buck型三电平AC-AC变换器控制策略研究[J].电气传动,2017,47(1):28-31.CHEN Ke,ZHANG Youjun.Control strategy of Buck type three-level AC-AC converter[J].Electric Drive,2017,47(1):28-31.
[16] 张友军,陈可,叶欣,等.Boost型三电平AC/AC变换器[J].电机与控制学报,2017,21(3):48-54.ZHANG Youjun,CHEN Ke,YE Xin,et al.Boost type three-level AC/AC converter[J].Electric Machines and Control,2017,21(3):48-54.
[2] VAZQUEZ N,LOPEZ H,HERNANDEZ C,et al.A different multilevel current-source inverter[J].IEEE Transactions on Industrial Electronics,2010,57(8):2623-2632.
[3] 阮新波.三电平直流变换器及其软开关技术[M].北京:科学出版社出版,2006:19-21.
[4] 章勇高,熊健.级联多电平H桥逆变器的同相层叠型SPWM脉冲分配方法[J].电力自动化设备,2017,37(7):148-154.ZHANG Yonggao,XIONG Jian.Pulse distribution strategy for IPD-SPWM of cascaded multi-level H-bridge inverter[J].Electric Power Automation Equipment,2017,37(7):148-154.
[5] 郝亮亮,张静,黄银华,等.模块化多电平换流器的分频均压控制策略[J].电力自动化设备,2018,38(6):195-200,223.HAO Liangliang,ZHANG Jing,HUANG Yinhua,et al.Frequency dividing control of capacitor voltage balance for modular multilevel converter[J].Electric Power Automation Equipment,2018,38(6):195-200,223.
[6] 辛业春,王威儒,李国庆,等.基于桥臂电流直接控制的模块化多电平换流器控制策略[J].电力自动化设备,2018,38(10):115-120.XIN Yechun,WANG Weiru,LI Guoqing,et al.Control strategy of modular multilevel converter based on arm current direct control[J].Electric Power Automation Equipment,2018,38(10):115-120.
[7] 李磊,杨君东.单级三电平交流斩波器的控制策略研究[J].电力电子技术,2011,45(7):24-26.LI Lei,YANG Jundong.Control strategy of single-stage three-level AC chopper[J].Power Electronics,2011,45(7):24-26.
[8] ANGKITITRAKUL S,ERICKSON R W.Control and implementation of a new modular matrix converter[C]//19th Annual IEEE Applied Power Electronics Conference and Exposition.Anaheim,USA:IEEE,2004:813-819.
[9] 朱建林,李利娟,刘红良,等.使用空间矢量调制的三电平矩阵变换器控制策略[J].中国电机工程学报,2008,28(9):12-16.ZHU Jianlin,LI Lijuan,LIU Hongliang,et al.Simulation of three-level matrix converter based on space vector modulation[J].Proceedings of the CSEE,2008,28(9):12-16.
[10] RODRIGUEZ J,BERNET S,STEIMER P K,et al.A survey on neutral-point-clamped inverter[J].IEEE Transactions on Industrial Electronics,2010,57(7):2219-2230.
[11] 吴洪洋,何湘宁.级联型多电平变换器PWM控制方法的仿真研究[J].中国电机工程学报,2001,21(8):42-46.WU Hongyang,HE Xiangning.Research on PWM control of a cascade multilevel converter[J].Proceedings of the CSEE,2001,21(8):42-46.
[12] 石勇,杨旭,王兆安.新型三电平PWM交流斩波器[J].电工技术学报,2003,18(6):7-11.SHI Yong,YANG Xu,WANG Zhaoan.A novel three-level PWM AC chopper[J].Transactions of China Electrotechnical Society,2003,18(6):7-11.
[13] 王立乔,刘青.时钟交错定频积分控制的三电平交流斩波器[J].电机与控制学报,2010,14(3):51-56.WANG Liqiao,LIU Qing.Clock-interleaved constant frequency integration controlled three level AC chopper[J].Electric Machines and Control,2010,14(3):51-56.
[14] 李磊,唐栋材.新型级联式交流斩波器[J].电工技术学报,2012,27(10):196-201.LI Lei,TANG Dongcai.Cascade mode three level AC chopper[J].Transactions of China Electrotechnical Society,2012,27(10):196-201.
[15] 陈可,张友军.Buck型三电平AC-AC变换器控制策略研究[J].电气传动,2017,47(1):28-31.CHEN Ke,ZHANG Youjun.Control strategy of Buck type three-level AC-AC converter[J].Electric Drive,2017,47(1):28-31.
[16] 张友军,陈可,叶欣,等.Boost型三电平AC/AC变换器[J].电机与控制学报,2017,21(3):48-54.ZHANG Youjun,CHEN Ke,YE Xin,et al.Boost type three-level AC/AC converter[J].Electric Machines and Control,2017,21(3):48-54.