线性自抗扰技术在LCL逆变器并网电流控制及有源阻尼中的应用
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摘要
有源阻尼是解决LCL滤波器谐振问题的有效措施,传统的电容电流反馈有源阻尼方法需要增加额外的电流传感器,并网电流反馈有源阻尼存在微分信号提取困难等问题。为此,提出基于线性自抗扰技术(linear active disturbance rejection control,LADRC)的LCL逆变器并网电流控制及有源阻尼策略。基于LCL滤波器数学模型,设计三阶LADRC并网电流控制器,分析LADRC的跟踪和抗扰能力;将扩张状态观测器(extend state observer,ESO)得到的并网电流微分及二阶微分观测信号作为有源阻尼反馈量,以实现基于并网电流微分反馈的谐振抑制目标,避免了传统直接求取电流微分带来的噪声等问题。仿真和实验结果证明了本文所提策略的有效性。
Active damping is an effective way to eliminate resonance of LCL type inverter. However, active damping method based on traditional capacitive current feedback needs additional current sensors, while the method of grid current feedback has difficulties in extracting differential signals.Therefore, a grid current control and active damping strategy of LCL type inverter based on linear active disturbance rejection control(LADRC) were proposed in this paper. Firstly, a third-order LADRC grid current controller was designed, to help improvement of system anti-disturbance ability. Thanks to LADRC strategy, the differential and second-order differential signals of grid current, used in active damping feedback channels to realize the resonance suppression target, could be obtained from the extended state observer(ESO) easily,avoiding problems of direct differentiation. Simulation and experimental results demonstrated effectiveness of proposed strategy.
Active damping is an effective way to eliminate resonance of LCL type inverter. However, active damping method based on traditional capacitive current feedback needs additional current sensors, while the method of grid current feedback has difficulties in extracting differential signals.Therefore, a grid current control and active damping strategy of LCL type inverter based on linear active disturbance rejection control(LADRC) were proposed in this paper. Firstly, a third-order LADRC grid current controller was designed, to help improvement of system anti-disturbance ability. Thanks to LADRC strategy, the differential and second-order differential signals of grid current, used in active damping feedback channels to realize the resonance suppression target, could be obtained from the extended state observer(ESO) easily,avoiding problems of direct differentiation. Simulation and experimental results demonstrated effectiveness of proposed strategy.
引文
[1]许津铭,谢少军,张斌锋.分布式发电系统中LCL滤波并网逆变器电流控制研究综述[J].中国电机工程学报,2015,35(16):4153-4166.Xu Jinming,Xie Shaojun,Zhang Binfeng.Overview of current control techniques for grid-connected inverters with LCL filters in distributed power generation systems[J].Proceedings of the CSEE,2015,35(16):4153-4166(in Chinese).
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[9]徐国峰,王善华,叶永强,等.分数阶相位补偿在无电容电流传感器并网逆变器中的应用[J].电力系统自动化,2017,41(3):117-121.Xu Guofeng,Wang Shanhua,Ye Yongqiang,et al.Application of fractional-order phase compensation in grid-connected inverter without capacitive current sensor[J].Automation of Electric Power Systems,2017,41(3):117-121(in Chinese).
[10]潘冬华,阮新波,王学华,等.提高LCL型并网逆变器鲁棒性的电容电流即时反馈有源阻尼方法[J].中国电机工程学报,2013,33(18):1-10.Pan Donghua,Ruan Xinbo,Wang Xuehua,et al.A capacitor-current real-time feedback active damping method for improving robustness of the LCL-type grid-connected inverter[J].Proceedings of the CSEE,2013,33(18):1-10(in Chinese).
[11]王学华,阮新波,刘尚伟.抑制电网背景谐波影响的并网逆变器控制策略[J].中国电机工程学报,2011,31(6):7-14.Wang Xuehua,Ruan Xinbo,Liu Shangwei.Control strategy for grid-connected inverter to suppress current distortion effected by background harmonics in grid voltage[J].Proceedings of the CSEE,2011,31(6):7-14(in Chinese).
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[13]Wang X,Blaabjerg F,Loh P C.Grid-current-feedback active damping for LCL resonance in grid-connected voltage-source converters[J].IEEE Transactions on Power Electronics,2015,31(1):213-223.
[14]Xu J M,Xie S J,Tang T.Active damping-based control for grid-connected LCL-filtered inverter with injected grid current feedback only[J].IEEE Transactions on Industrial Electronics,2014,61(9):4746-4758.
[15]韩京清.自抗扰控制技术[M].北京:国防工业出版社,2008.
[16]Gao Z.Scaling and bandwidth-parameterization based controller tuning[C]//Proceedings of the American Control Conference.Denver,Colorado:IEEE,2003:4989-4996.
[17]李杰,齐晓慧,万慧,等.自抗扰控制:研究成果总结与展望[J].控制理论与应用,2017,34(3):281-295.Li Jie,Qi Xiaohui,Wan Hui,et al.Active disturbance rejection control:theoretical results summary and future researches[J].Control Theory&Applications,2017,34(3):281-295(in Chinese).
[18]袁东,马晓军,曾庆含,等.二阶系统线性自抗扰控制器频带特性与参数配置研究[J].控制理论与应用,2013,30(12):1630-1640.Yuan Dong,Ma Xiaojun,Zeng Qinghan,et al.Research on frequency-band characteristics and parameters configuration of linear active disturbance rejection control for second-order systems[J].Control Theory&Applications,2013,30(12):1630-1640(in Chinese).
[19]马幼捷,赵健,周雪松,等.并联混合型有源电力滤波器的线性自抗扰控制及稳定性分析[J].电网技术,2012,36(11):211-216.Ma Youjie,Zhao Jian,Zhou Xuesong,et al.A linear auto disturbance rejection controller for shunt hybrid active power filters and its stability analysis[J].Power System Technology,2012,36(11):211-216(in Chinese).
[20]郭源博,周鑫,张晓华,等.三相电压型脉宽调制整流器的自抗扰控制[J].电力系统自动化,2011,35(16):87-93.Guo Yuanbo,Zhou Xin,Zhang Xiaohua,et al.Development and implementation of integrated operation management system for provincial and prefectural power plant[J].Automation of Electric Power Systems,2011,35(16):87-93(in Chinese).
[21]Song Z,Tian Y,Yan Z,et al.Direct power control for three-phase two-level voltage-source rectifiers based on extended-state observation[J].IEEE Transactions on Industrial Electronics,2016,63(7):4593-4603.
[22]袁晓冬,楼冠男,陈亮,等.基于线性自抗扰的微电网平滑切换控制策略[J].电网技术,2017,41(12):3824-3831.Yuan Xiaodong,Lou Guannan,Chen Liang,et al.Control strategy for microgrid seamless switching via linear active disturbance rejection[J].Power System Technology,2017,41(12):3824-3831(in Chinese).
[23]Xu R,Yu Y,Yang R,et al.A novel control method for transformerless H-bridge cascaded statcom with star configuration[J].IEEETransactions on Power Electronics,2015,30(3):1189-1202.
[24]于雁南,杨荣峰,严继池,等.级联H桥静止无功发生器的多变量自抗扰解耦控制[J].中国电机工程学报,2016,36(8):2233-2241.Yu Yannan,Yang Rongfeng,Yan Jichi,et al.Multiple-input multiple-output decoupling control schemes of static var generator with cascaded H-bridge based on active disturbance rejection control[J].Proceedings of the CSEE,2016,36(8):2233-2241(in Chinese).
[25]赵宇,王俊杰,姚为正,等.新型改进内模解耦控制的STATCOM电流环控制方案设计[J].中国电机工程学报,2017,37(18):5409-5419.Zhao Yu,Wang Junjie,Yao Weizheng,et al.Current loop controller design of statcom based on the new improved internal model decoupling control[J].Proceedings of the CSEE,2017,37(18):5409-5419(in Chinese).
[2]Parker S G,Mcgrath B P,Holmes D G.Regions of active damping control for LCL filters[J].IEEE Transactions on Industry Applications,2014,50(1):424-432.
[3]Pe?a-Alzola R,Liserre M,Blaabjerg F,et al.LCL-filter design for robust active damping in grid-connected converters[J].IEEETransactions on Industrial Informatics,2014,10(4):2192-2203.
[4]匡慧敏,罗安,陈智勇,等.多逆变器并网耦合谐振机理及有源阻尼优化方法[J].电网技术,2016,40(4):1180-1189.Kuang Huimin,Luo An,Chen Zhiyong,et al.Coupling resonances mechanism of grid-connected multi-parallel inverters and its active damping parameter optimal method[J].Power System Technology,2016,40(4):1180-1189(in Chinese).
[5]尹靖元,金新民,吴学智,等.基于带通滤波器的LCL型滤波器有源阻尼控制[J].电网技术,2013,37(8):2376-2382.Yin Jingyuan,Jin Xinmin,Wu Xuezhi,et al.Active damping control strategy for LCL filter based on band pass filter[J].Power System Technology,2013,37(8):2376-2382(in Chinese).
[6]周乐明,罗安,陈燕东,等.LCL型并网逆变器的鲁棒并网电流反馈有源阻尼控制方法[J].中国电机工程学报,2016,36(10):2742-2752.Zhou Leming,Luo An,Chen Yandong,et al.A robust grid current feedback active-damping method for LCL-type grid-connected inverters[J].Proceedings of the CSEE,2016,36(10):2742-2752(in Chinese).
[7]杨苓,罗安,陈燕东,等.LCL型逆变器的鲁棒延时补偿并网控制方法及其稳定性分析[J].电网技术,2015,39(11):3102-3108.Yang Ling,Luo An,Chen Yandong,et al.A robust time delay compensated grid-connected control method for LCL-type inverter and stability analysis[J].Power System Technology,2015,39(11):3102-3108(in Chinese).
[8]Said-Romdhane M B,Naouar M W,Slama-Belkhodja I,et al.Robust active damping methods for LCL filter based grid connected converters[J].IEEE Transactions on Power Electronics,2018,PP(99):1-1.
[9]徐国峰,王善华,叶永强,等.分数阶相位补偿在无电容电流传感器并网逆变器中的应用[J].电力系统自动化,2017,41(3):117-121.Xu Guofeng,Wang Shanhua,Ye Yongqiang,et al.Application of fractional-order phase compensation in grid-connected inverter without capacitive current sensor[J].Automation of Electric Power Systems,2017,41(3):117-121(in Chinese).
[10]潘冬华,阮新波,王学华,等.提高LCL型并网逆变器鲁棒性的电容电流即时反馈有源阻尼方法[J].中国电机工程学报,2013,33(18):1-10.Pan Donghua,Ruan Xinbo,Wang Xuehua,et al.A capacitor-current real-time feedback active damping method for improving robustness of the LCL-type grid-connected inverter[J].Proceedings of the CSEE,2013,33(18):1-10(in Chinese).
[11]王学华,阮新波,刘尚伟.抑制电网背景谐波影响的并网逆变器控制策略[J].中国电机工程学报,2011,31(6):7-14.Wang Xuehua,Ruan Xinbo,Liu Shangwei.Control strategy for grid-connected inverter to suppress current distortion effected by background harmonics in grid voltage[J].Proceedings of the CSEE,2011,31(6):7-14(in Chinese).
[12]Han Y,Li Z,Yang P,et al.Analysis and design of improved weighted average current control strategy for LCL-type grid-connected inverters[J].IEEE Transactions on Energy Conversion,2017,PP(99):1-1.
[13]Wang X,Blaabjerg F,Loh P C.Grid-current-feedback active damping for LCL resonance in grid-connected voltage-source converters[J].IEEE Transactions on Power Electronics,2015,31(1):213-223.
[14]Xu J M,Xie S J,Tang T.Active damping-based control for grid-connected LCL-filtered inverter with injected grid current feedback only[J].IEEE Transactions on Industrial Electronics,2014,61(9):4746-4758.
[15]韩京清.自抗扰控制技术[M].北京:国防工业出版社,2008.
[16]Gao Z.Scaling and bandwidth-parameterization based controller tuning[C]//Proceedings of the American Control Conference.Denver,Colorado:IEEE,2003:4989-4996.
[17]李杰,齐晓慧,万慧,等.自抗扰控制:研究成果总结与展望[J].控制理论与应用,2017,34(3):281-295.Li Jie,Qi Xiaohui,Wan Hui,et al.Active disturbance rejection control:theoretical results summary and future researches[J].Control Theory&Applications,2017,34(3):281-295(in Chinese).
[18]袁东,马晓军,曾庆含,等.二阶系统线性自抗扰控制器频带特性与参数配置研究[J].控制理论与应用,2013,30(12):1630-1640.Yuan Dong,Ma Xiaojun,Zeng Qinghan,et al.Research on frequency-band characteristics and parameters configuration of linear active disturbance rejection control for second-order systems[J].Control Theory&Applications,2013,30(12):1630-1640(in Chinese).
[19]马幼捷,赵健,周雪松,等.并联混合型有源电力滤波器的线性自抗扰控制及稳定性分析[J].电网技术,2012,36(11):211-216.Ma Youjie,Zhao Jian,Zhou Xuesong,et al.A linear auto disturbance rejection controller for shunt hybrid active power filters and its stability analysis[J].Power System Technology,2012,36(11):211-216(in Chinese).
[20]郭源博,周鑫,张晓华,等.三相电压型脉宽调制整流器的自抗扰控制[J].电力系统自动化,2011,35(16):87-93.Guo Yuanbo,Zhou Xin,Zhang Xiaohua,et al.Development and implementation of integrated operation management system for provincial and prefectural power plant[J].Automation of Electric Power Systems,2011,35(16):87-93(in Chinese).
[21]Song Z,Tian Y,Yan Z,et al.Direct power control for three-phase two-level voltage-source rectifiers based on extended-state observation[J].IEEE Transactions on Industrial Electronics,2016,63(7):4593-4603.
[22]袁晓冬,楼冠男,陈亮,等.基于线性自抗扰的微电网平滑切换控制策略[J].电网技术,2017,41(12):3824-3831.Yuan Xiaodong,Lou Guannan,Chen Liang,et al.Control strategy for microgrid seamless switching via linear active disturbance rejection[J].Power System Technology,2017,41(12):3824-3831(in Chinese).
[23]Xu R,Yu Y,Yang R,et al.A novel control method for transformerless H-bridge cascaded statcom with star configuration[J].IEEETransactions on Power Electronics,2015,30(3):1189-1202.
[24]于雁南,杨荣峰,严继池,等.级联H桥静止无功发生器的多变量自抗扰解耦控制[J].中国电机工程学报,2016,36(8):2233-2241.Yu Yannan,Yang Rongfeng,Yan Jichi,et al.Multiple-input multiple-output decoupling control schemes of static var generator with cascaded H-bridge based on active disturbance rejection control[J].Proceedings of the CSEE,2016,36(8):2233-2241(in Chinese).
[25]赵宇,王俊杰,姚为正,等.新型改进内模解耦控制的STATCOM电流环控制方案设计[J].中国电机工程学报,2017,37(18):5409-5419.Zhao Yu,Wang Junjie,Yao Weizheng,et al.Current loop controller design of statcom based on the new improved internal model decoupling control[J].Proceedings of the CSEE,2017,37(18):5409-5419(in Chinese).