中频三相四桥臂逆变器控制策略不平衡负载状态相量模型分析
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摘要
三相四桥臂逆变器具备不平衡负载工作能力与三相解耦控制功能,但是在中频场合基于模拟控制的四桥臂控制策略较为复杂。该文基于第四桥臂开环、闭环控制方法,结合三次谐波注入控制策略,采用建立主电路电压、电流以及控制环路信号相量模型的方式,通过分析和对比不同控制策略在不平衡负载下的工作特性,得到第四桥臂控制方法与电路参数的关系,总结控制策略设计依据。证明基于三相电流环输出控制信号合成的三次谐波能够在不平衡负载状态实现对第四桥臂大部分零序分量的补偿。在此基础上,提出一种结合三次谐波注入与中线电流闭环的控制方法,该方法在保证直流电压利用率的同时,进一步提高了不平衡负载下三相输出波形质量。该文还通过仿真和实验验证了理论分析的正确性。
Three phase four leg inverter has ability to work under unsymmetrical load, also has three phase decoupling character. However, control strategy based on analog circuit in middle-frequency applications is complex. In this thesis, based on control strategies,such as open loop, closed loop and three harmonic injection of fourth leg, vector model consists of voltage, current signals of main and control circuit also can be established. Relationship of control strategies of fourth leg and circuit parameters can be obtained by comparing control characteristics of fourth leg control strategies. In conclusion, it can be proved that third harmonic signal generated by output signals of three phase current loops can compensate most of zero-sequence component of fourth leg under unsymmetrical load. On this basis, in this thesis, the control strategy combines both third harmonic signal injection and closed loop control of fourth leg is proposed, it can not only guarantee the DC voltage utilization, but also improve the quality of output voltage under unsymmetrical load. Simulation and experiment results prove theoretical analysis is correct.
Three phase four leg inverter has ability to work under unsymmetrical load, also has three phase decoupling character. However, control strategy based on analog circuit in middle-frequency applications is complex. In this thesis, based on control strategies,such as open loop, closed loop and three harmonic injection of fourth leg, vector model consists of voltage, current signals of main and control circuit also can be established. Relationship of control strategies of fourth leg and circuit parameters can be obtained by comparing control characteristics of fourth leg control strategies. In conclusion, it can be proved that third harmonic signal generated by output signals of three phase current loops can compensate most of zero-sequence component of fourth leg under unsymmetrical load. On this basis, in this thesis, the control strategy combines both third harmonic signal injection and closed loop control of fourth leg is proposed, it can not only guarantee the DC voltage utilization, but also improve the quality of output voltage under unsymmetrical load. Simulation and experiment results prove theoretical analysis is correct.
引文
[1]陈轶涵,沈茜,任磊,等.基于虚拟阻抗分析的并联三相四桥臂逆变器环流抑制[J].电工技术学报,2016,31(8):51-62.Chen Yihan,Shen Qian,Ren Lei,et al.Output impedance analysis for circulating current minimization of paralleled three phase four leg inverter[J].Transactions of China Electrotechnical Society,2016,31(8):51-62.
[2]王慧贞,丁勇,张方华,等.开关点预置的四桥臂三相逆变器[J].电工技术学报,2008,28(3):73-76.Wang Huizhen,Ding Yong,Zhang Fanghua,et al.Four-leg three-phase inverter based on switching-node preset[J].Transactions of China Electrotechnical Society,2008,28(3):73-76.
[3]郑昕昕,肖岚,田洋天,等.三相双Buck逆变器过零畸变问题与解决方法[J].中国电机工程学报,2014,34(9):1337-1344.Zheng Xinxin,Xiao Lan,Tian Yangtian,et al.Zerocrossing distortion and solution of three-phase dualbuck inverters[J].Proceeding of the CSEE,2014,34(9):1337-1344.
[4]曹剑坤.基于400Hz电力系统的飞机外部供电关键技术研究[D].南京:南京航空航天大学,2016.
[5]马海啸,叶海云,龚春英.三相四桥臂逆变器的三角波辅助控制策略[J].电机与控制学报,2016,20(1):14-21.Ma Haixiao,Ye Haiyun,Gong Chunying.Control strategy of three-phase four-leg inverter using an auxiliary triangle waveform[J].Electric Machines and control,2016,20(1):14-21.
[6]Mohammad P,Hasan R.Sliding-mode control of fourleg inverter with fixed switching frequency for uninterruptible power supply applications[J].IEEETransactions on industrial electronics,2017,64(8):6805-6814.
[7]周啸,金新民,唐芬,等.微电网孤岛工况下基于四桥臂变流器的不平衡负载分配策略[J].电工技术学报,2015,30(12):76-86.Zhou Xiao,Jin Xinmin,Tang Fen,et al.Four-leg converter based unbalanced load sharing method in islanding microgrid[J].Transactions of China Electrotechnical Society,2015,30(12):76-86.
[8]Li Zhang,Waite M J,Chong B.Three-phase four-leg flying-capacitor multi-level inverter-based active power filter for unbalanced current operation[J].IETPower Electronics,2012,6(1):153-163.
[9]邹常跃,刘邦银,段善旭,等.并网逆变器中数字控制延时对系统稳定性的影响及其优化设计[J].中国电机工程学报,2015,35(2):411-417.Zou Changyue,Liu Bangyin,Duan Shanxu,et al.Influence of delay on system stability and its optimization in grid-connected inverters[J].Proceedings of the CSEE,2015,35(2):411-417.
[10]Vechiu I,Curea O,Camblong H,et al.Digital control of a three-phase four-leg inverter under unbalanced voltage conditions[C]//European conference on power electronics and applications,Aalborg,Denmark,2007:1-10.
[11]Chen Jiawei,Wen Changyun,Lee M Y,et al.Design of a highly reliable three-phase four-leg inversion power supply for more electric aircraft[C]//2015 IEEE10th Conference on Industrial Electronics and Applications(ICIEA),Auckland,New Zealand,2015:351-356.
[12]张方华,龚春英,邓翔.航空静止变流器的研究综述[J].南京航空航天大学学报,2014,46(1):19-26.Zhang Fanghua,Gong Chunying,Deng Xiang.Review of aeronautic static inverter[J].Journal of Nanjing University of Aeronautics&Astronautics,2014,46(1):19-26.
[13]陈轶涵,任磊,邓翔,等.一种基于3次谐波注入的并联三相四桥臂逆变器均流控制策略[J].电工技术学报,2016,31(4):104-113.Chen Yihan,Ren Lei,Deng Xiang,et al.Current sharing control method for parallel three phase four leg inverter based on third harmonic injection[J].Transactions of China Electrotechnical Society,2016,31(4):104-113.
[14]陈宏志,刘秀翀.四桥臂三相逆变器的解耦控制[J].电机工程学报,2007,27(19):19-24.Chen Hongzhi,Liu Xiuchong.Decoupling control of three-phase four-legged inverter[J].Proceedings of the CSEE,2007,27(19):19-24.
[15]Lazzarin T B,Bauer G A T,Barbi I.A control strategy by instantaneous average values for parallel operation of single phase voltage source inverters based in the inductor current feedback[C]//ECCE,San Jose,CA,USA,2009:495-502.
[16]Wang Shuhui,Ju Wenyao,Jia Zhonglu,et al.Study on dual-loop control for inverters based on state observer with repetitive compensation[C]//International Power Electronics and Motion Control Conference,Wuhan,China,2009:1550-1553.
[17]Teixeira C A,McGrath B P,Holmes D G.Closed-loop current control of multilevel converters formed by parallel complementary unidirectional phase-legs[J].IEEE Transactions on Industry Applications,2014,51(2):1621-1629.
[18]Alarcon-Gallo E.Third harmonic injection on sliding mode control for a three-phase,three-wire inverter[C]//Annual Conference of the IEEE Industrial Electronics Society,Vienna,2013:1910-1915.
[19]韦徵,陈新,陈杰,等.三相四桥臂PWM整流器的研究[J].电工技术学报,2014,29(8):128-135.Wei Zheng,Chen Xin,Chen Jie,et al.Research of three-phase four legs rectifier[J].Transactions of China Electrotechnical Society,2014,29(8):128-135.
[2]王慧贞,丁勇,张方华,等.开关点预置的四桥臂三相逆变器[J].电工技术学报,2008,28(3):73-76.Wang Huizhen,Ding Yong,Zhang Fanghua,et al.Four-leg three-phase inverter based on switching-node preset[J].Transactions of China Electrotechnical Society,2008,28(3):73-76.
[3]郑昕昕,肖岚,田洋天,等.三相双Buck逆变器过零畸变问题与解决方法[J].中国电机工程学报,2014,34(9):1337-1344.Zheng Xinxin,Xiao Lan,Tian Yangtian,et al.Zerocrossing distortion and solution of three-phase dualbuck inverters[J].Proceeding of the CSEE,2014,34(9):1337-1344.
[4]曹剑坤.基于400Hz电力系统的飞机外部供电关键技术研究[D].南京:南京航空航天大学,2016.
[5]马海啸,叶海云,龚春英.三相四桥臂逆变器的三角波辅助控制策略[J].电机与控制学报,2016,20(1):14-21.Ma Haixiao,Ye Haiyun,Gong Chunying.Control strategy of three-phase four-leg inverter using an auxiliary triangle waveform[J].Electric Machines and control,2016,20(1):14-21.
[6]Mohammad P,Hasan R.Sliding-mode control of fourleg inverter with fixed switching frequency for uninterruptible power supply applications[J].IEEETransactions on industrial electronics,2017,64(8):6805-6814.
[7]周啸,金新民,唐芬,等.微电网孤岛工况下基于四桥臂变流器的不平衡负载分配策略[J].电工技术学报,2015,30(12):76-86.Zhou Xiao,Jin Xinmin,Tang Fen,et al.Four-leg converter based unbalanced load sharing method in islanding microgrid[J].Transactions of China Electrotechnical Society,2015,30(12):76-86.
[8]Li Zhang,Waite M J,Chong B.Three-phase four-leg flying-capacitor multi-level inverter-based active power filter for unbalanced current operation[J].IETPower Electronics,2012,6(1):153-163.
[9]邹常跃,刘邦银,段善旭,等.并网逆变器中数字控制延时对系统稳定性的影响及其优化设计[J].中国电机工程学报,2015,35(2):411-417.Zou Changyue,Liu Bangyin,Duan Shanxu,et al.Influence of delay on system stability and its optimization in grid-connected inverters[J].Proceedings of the CSEE,2015,35(2):411-417.
[10]Vechiu I,Curea O,Camblong H,et al.Digital control of a three-phase four-leg inverter under unbalanced voltage conditions[C]//European conference on power electronics and applications,Aalborg,Denmark,2007:1-10.
[11]Chen Jiawei,Wen Changyun,Lee M Y,et al.Design of a highly reliable three-phase four-leg inversion power supply for more electric aircraft[C]//2015 IEEE10th Conference on Industrial Electronics and Applications(ICIEA),Auckland,New Zealand,2015:351-356.
[12]张方华,龚春英,邓翔.航空静止变流器的研究综述[J].南京航空航天大学学报,2014,46(1):19-26.Zhang Fanghua,Gong Chunying,Deng Xiang.Review of aeronautic static inverter[J].Journal of Nanjing University of Aeronautics&Astronautics,2014,46(1):19-26.
[13]陈轶涵,任磊,邓翔,等.一种基于3次谐波注入的并联三相四桥臂逆变器均流控制策略[J].电工技术学报,2016,31(4):104-113.Chen Yihan,Ren Lei,Deng Xiang,et al.Current sharing control method for parallel three phase four leg inverter based on third harmonic injection[J].Transactions of China Electrotechnical Society,2016,31(4):104-113.
[14]陈宏志,刘秀翀.四桥臂三相逆变器的解耦控制[J].电机工程学报,2007,27(19):19-24.Chen Hongzhi,Liu Xiuchong.Decoupling control of three-phase four-legged inverter[J].Proceedings of the CSEE,2007,27(19):19-24.
[15]Lazzarin T B,Bauer G A T,Barbi I.A control strategy by instantaneous average values for parallel operation of single phase voltage source inverters based in the inductor current feedback[C]//ECCE,San Jose,CA,USA,2009:495-502.
[16]Wang Shuhui,Ju Wenyao,Jia Zhonglu,et al.Study on dual-loop control for inverters based on state observer with repetitive compensation[C]//International Power Electronics and Motion Control Conference,Wuhan,China,2009:1550-1553.
[17]Teixeira C A,McGrath B P,Holmes D G.Closed-loop current control of multilevel converters formed by parallel complementary unidirectional phase-legs[J].IEEE Transactions on Industry Applications,2014,51(2):1621-1629.
[18]Alarcon-Gallo E.Third harmonic injection on sliding mode control for a three-phase,three-wire inverter[C]//Annual Conference of the IEEE Industrial Electronics Society,Vienna,2013:1910-1915.
[19]韦徵,陈新,陈杰,等.三相四桥臂PWM整流器的研究[J].电工技术学报,2014,29(8):128-135.Wei Zheng,Chen Xin,Chen Jie,et al.Research of three-phase four legs rectifier[J].Transactions of China Electrotechnical Society,2014,29(8):128-135.