输入串联输出并联LCL型并网逆变器系统的目标多重化控制策略
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摘要
输入串联输出并联(ISOP)逆变器组合系统适用于高直流电压输入、大功率交流输出的应用场合。如果将ISOP逆变器的拓扑应用在并网场合,那么一个大容量的并网逆变器就可以由多个小容量的标准化逆变器模块组成,这将有效提高系统的可靠性并且有利于系统的设计。本文基于ISOPLCL型并网逆变器组合系统,给出其优化拓扑以降低系统的体积和质量,并据此筛选控制变量,进而提出一种分布式控制策略以实现并网系统的多重控制目标,其包含模块间的功率均衡、谐振尖峰的抑制和进网电流的高功率因数。然后,论文在所提分布式控制的基础上给出一种冗余运行方案,保证ISOP逆变器并网系统中故障模块的平滑退出和备份模块的顺利投入。最后通过实验,验证了所提方案的有效性。
Input-series-output-parallel(ISOP) inverter combined system is generally used in the occasions of high DC voltage at the input terminal and high AC power at the output side. If the topology of the ISOP inverter is applied to the grid-connected system, multiple small-capacity standardized inverter modules can constitute a bulky-capacity grid-connected inverter system, which will effectively improve system reliability and facilitate system design. In this paper, based on ISOP LCL grid-connected inverter combination system, its topology is optimized to reduce the volume and weight of the system. Then the control variables are carefully chosen, and a novel distributed control strategy is put forward to achieve multiple control objectives of grid-connected combined system,including power balance, suppression of resonance spikes, and high power factor of grid current. After that, based on the distributed control, the paper proposes a redundant operation plan to ensure the smooth exit of the faulty module and the successful throwing into the system of the back-up module.Finally, the prototypes are tested, which verifies the proposed scheme.
Input-series-output-parallel(ISOP) inverter combined system is generally used in the occasions of high DC voltage at the input terminal and high AC power at the output side. If the topology of the ISOP inverter is applied to the grid-connected system, multiple small-capacity standardized inverter modules can constitute a bulky-capacity grid-connected inverter system, which will effectively improve system reliability and facilitate system design. In this paper, based on ISOP LCL grid-connected inverter combination system, its topology is optimized to reduce the volume and weight of the system. Then the control variables are carefully chosen, and a novel distributed control strategy is put forward to achieve multiple control objectives of grid-connected combined system,including power balance, suppression of resonance spikes, and high power factor of grid current. After that, based on the distributed control, the paper proposes a redundant operation plan to ensure the smooth exit of the faulty module and the successful throwing into the system of the back-up module.Finally, the prototypes are tested, which verifies the proposed scheme.
引文
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[7]陈武,阮新波,庄凯.输入串联输出并联DC/AC逆变器系统的控制策略[J].中国电机工程学报,2010,30(15):16-23.Chen Wu,Ruan Xinbo,Zhuang Kai.Control strategy for input-series and output-parallel connected inverter system[J].Proceedings of the CSEE,2010,30(15):16-23.
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[9]方天治,沈乐,何玮,等.多逆变器模块输入串联输出并联组合系统的分布式控制及其冗余技术研究[J].中国电机工程学报,2016,36(8):2223-2232.Fang Tianzhi,Shen Le,He Wei,et al.A novel strategy to achieve distributed control and redundancy for multi-module input-series-output-parallel connected inverter systems[J].Proceedings of the CSEE,2016,36(8):2223-2232.
[10]Liserre M,Blaabjerg F,Hansen S.Design and control of an LCL-filter-based three-phase active rectifier[J]IEEE Transactions on Industry Applications,2005,41(5):1281-1291.
[11]Dannehl J,Liserre M,Fuchs F.Filter-based active damping of voltage converters with LCL-filter[J].IEEE Transactions on Industrial Electronics,2011,58(8):3623-3633.
[12]Gabe I,Montagner V,Pinheiro H.Design and implementation of a robust current controller for VSIconnected to the grid through an LCL filter[J].IEEETransactions on Power Electronics,2009,24(6):1444-1452.
[13]Ahmed K,Massoud A,Finney S,et al.A modified stationary reference frame-based predictive current control with zero steady-state error for LCL coupled inverter-based distributed generation systems[J].IEEE Transactions on Industrial Electronics,2011,58(4):1359-1370.
[14]周乐明,罗安,陈燕东,等.单相LCL型并网逆变器功率控制及有源阻尼优化方法[J].电工技术学报,2016,31(6):144-154.Zhou Leming,Luo An,Chen Yandong.et al.Asingle-phase grid-connected power control and active damping optimization strategy with LCL filter[J]Transactions of China Electrotechnical Society,2016,31(6):144-154.
[15]鲍陈磊.LCL型并网逆变器的并网电流调节器和电容电流反馈有源阻尼设计[D].武汉:华中科技大学,2013.
[16]杨东升.弱电网下LCL型并网逆变器的电流和功率控制技术[D].南京:南京航空航天大学,2016.
[17]刘尚伟.单相LCL逆变器并网技术研究[D].武汉:华中科技大学,2011.
[18]杨树德,同向前,尹军,等.增强并网逆变器对电网阻抗鲁棒稳定性的改进前馈控制方法[J].电工技术学报,2017,32(10):222-230.Yang Shude,Tong Xiangqian,Yin Jun,et al.An improved grid voltage feedforward strategy for gridconnected inverter to achieve high robust stability against grid-impedance variation[J].Transactions of China Electrotechnical Society,2017,32(10):222-230.
[2]郭小强,朱铁影.新型非隔离型三相三电平光伏并网逆变器及其漏电流抑制研究[J].电工技术学报,2018,33(1):26-37.Guo Xiaoqiang,Zhu Tieying.Research on leakage current suppression of novel three-phase three-level non-isolated PV inverter[J].Transactions of China Electrotechnical Society,2018,33(1):26-37.
[3]沈虹,郭忠南,关红磊,等.单相四开关多电平光伏逆变器研究[J].电工技术学报,2018,33(8):1-8.Shen Hong,Guo Zhongnan,Guan Honglei,et al Research on single-phase four-switch multilevel pv inverter[J].Transactions of China Electrotechnical Society,2018,33(8):1-8.
[4]方天治,阮新波.两类串并联逆变器组合系统的控制策略[J].电工技术学报,2010,25(8):72-78.Fang Tianzhi,Ruan Xinbo.Control strategy for two categories of series/parallel connection inverters system[J].Transactions of China Electrotechnical Society,2010,25(8):72-78.
[5]方天治,王健,阮新波.分布式输入串联输出并联逆变器系统的复合式控制策略[J].电工技术学报,2015,30(22):108-115.Fang Tianzhi,Wang Jian,Ruan Xinbo.Compound control strategy for distributed input-series-outputparallel inverter system[J].Transactions of China Electrotechnical Society,2015,30(22):108-115.
[6]Chen Wu,Zhuang Kai,Ruan Xinbo.Input-series and output-paralle connected inverter system for high input voltage applications[J].IEEE Transactions on Power Electronics,2009,24(9):2127-2137.
[7]陈武,阮新波,庄凯.输入串联输出并联DC/AC逆变器系统的控制策略[J].中国电机工程学报,2010,30(15):16-23.Chen Wu,Ruan Xinbo,Zhuang Kai.Control strategy for input-series and output-parallel connected inverter system[J].Proceedings of the CSEE,2010,30(15):16-23.
[8]Sha Deshang,Deng Kai,Guo Zhiqiang,et al.Control strategy for input-series-output-parallel high frequency AC link inverters[J].IEEE Transactions on Industrial Electronics,2012,59(11):4101-4111.
[9]方天治,沈乐,何玮,等.多逆变器模块输入串联输出并联组合系统的分布式控制及其冗余技术研究[J].中国电机工程学报,2016,36(8):2223-2232.Fang Tianzhi,Shen Le,He Wei,et al.A novel strategy to achieve distributed control and redundancy for multi-module input-series-output-parallel connected inverter systems[J].Proceedings of the CSEE,2016,36(8):2223-2232.
[10]Liserre M,Blaabjerg F,Hansen S.Design and control of an LCL-filter-based three-phase active rectifier[J]IEEE Transactions on Industry Applications,2005,41(5):1281-1291.
[11]Dannehl J,Liserre M,Fuchs F.Filter-based active damping of voltage converters with LCL-filter[J].IEEE Transactions on Industrial Electronics,2011,58(8):3623-3633.
[12]Gabe I,Montagner V,Pinheiro H.Design and implementation of a robust current controller for VSIconnected to the grid through an LCL filter[J].IEEETransactions on Power Electronics,2009,24(6):1444-1452.
[13]Ahmed K,Massoud A,Finney S,et al.A modified stationary reference frame-based predictive current control with zero steady-state error for LCL coupled inverter-based distributed generation systems[J].IEEE Transactions on Industrial Electronics,2011,58(4):1359-1370.
[14]周乐明,罗安,陈燕东,等.单相LCL型并网逆变器功率控制及有源阻尼优化方法[J].电工技术学报,2016,31(6):144-154.Zhou Leming,Luo An,Chen Yandong.et al.Asingle-phase grid-connected power control and active damping optimization strategy with LCL filter[J]Transactions of China Electrotechnical Society,2016,31(6):144-154.
[15]鲍陈磊.LCL型并网逆变器的并网电流调节器和电容电流反馈有源阻尼设计[D].武汉:华中科技大学,2013.
[16]杨东升.弱电网下LCL型并网逆变器的电流和功率控制技术[D].南京:南京航空航天大学,2016.
[17]刘尚伟.单相LCL逆变器并网技术研究[D].武汉:华中科技大学,2011.
[18]杨树德,同向前,尹军,等.增强并网逆变器对电网阻抗鲁棒稳定性的改进前馈控制方法[J].电工技术学报,2017,32(10):222-230.Yang Shude,Tong Xiangqian,Yin Jun,et al.An improved grid voltage feedforward strategy for gridconnected inverter to achieve high robust stability against grid-impedance variation[J].Transactions of China Electrotechnical Society,2017,32(10):222-230.