基于有源阻尼的单相LCL并网逆变器改进电流控制器
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摘要
为了提高LCL单相并网逆变器在电网频率波动情况下的控制精度,提出了一种采用比例、积分、谐振和准谐振复合控制环节的改进电流控制器。应用频率法对比例积分、比例谐振、准比例谐振以及改进电流控制器进行对比分析。结合传统比例积分控制器参数设计方法与权重系数获得合适的改进控制器参数,在所建立的基于有源阻尼的LCL单相并网逆变器仿真模型上对改进控制器与传统控制器进行实验对比。结果表明所提改进电流控制器克服了比例积分电流控制器无法实现并网电流无静差控制、比例谐振电流控制器对于电网频率变化鲁棒性很差以及比例准谐振控制器基波增益不够高的问题。
To improve the control accuracy of a single-phase grid-connected inverter with LCL filter in the case of grid frequency fluctuations,an improved current controller composed of proportional,integral,resonant and quasi-resonant control links is proposed. Frequency method is adopted in the comparative analysis of proportional-integral,proportional-resonance,quasi-proportional-resonant,and the improved current controllers. The appropriate parameters of the improved current controller are obtained by combining the parameter design method for the traditional proportional-integral controller with weight coefficients,and experimental comparisons of the improved controller with the traditional controllers are carried out on the simulation model of the LCL-type single-phase grid-connected inverter based on active damping. Simulation results show that the improved current controller can solve problems,such as the difficulty of the proportional-integral current controller in realizing zero steady-state error of grid-connected current,the poor robustness of the proportional-resonance current controller with respect to grid frequency,and the relatively lower fundamental wave gain of the proportional-quasi-resonant controller.
To improve the control accuracy of a single-phase grid-connected inverter with LCL filter in the case of grid frequency fluctuations,an improved current controller composed of proportional,integral,resonant and quasi-resonant control links is proposed. Frequency method is adopted in the comparative analysis of proportional-integral,proportional-resonance,quasi-proportional-resonant,and the improved current controllers. The appropriate parameters of the improved current controller are obtained by combining the parameter design method for the traditional proportional-integral controller with weight coefficients,and experimental comparisons of the improved controller with the traditional controllers are carried out on the simulation model of the LCL-type single-phase grid-connected inverter based on active damping. Simulation results show that the improved current controller can solve problems,such as the difficulty of the proportional-integral current controller in realizing zero steady-state error of grid-connected current,the poor robustness of the proportional-resonance current controller with respect to grid frequency,and the relatively lower fundamental wave gain of the proportional-quasi-resonant controller.
引文
[1]陈东,张军明,钱照明(Chen Dong,Zhang Junming,Qian Zhaoming).带LCL滤波器的并网逆变器单电流反馈控制策略(Single current feedback control strategy for gridconnected inverters with LCL filters)[J].中国电机工程学报(Proceedings of the CSEE),2013,33(9):10-16.
[2]张宁云(Zhang Ningyun). LCL型单相光伏并网逆变器电流控制与有源阻尼控制技术研究(Study on the Injected Current Control and Active Damping Control of Grid-Connected Single Photovoltaic Inverter with LCL Filter)[D].上海:上海交通大学电子信息与电气工程学院(Shanghai:School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University),2015.
[3]谢少军,许津铭(Xie Shaojun,Xu Jinming). LCL滤波并网逆变器的电流控制技术研究综述(Overview of current control strategy for grid-tied inverters with LCL filters)[J].电源学报(Journal of Power Supply),2012(4):1-6,18.
[4] Nardi C,Stein C M O,Carati E G,et al. A methodology of LCL filter design for grid-tied power converters[C]//IEEE13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference. Fortaleza,Brazil,2015.
[5]汪英,周乐明(Wang Ying,Zhou Leming). LCL型并网逆变器的GCFAD优化设计方法(Optimized design method of grid current feedback active damping for LCL-type grid-connected inverter)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(10):130-137.
[6]赵晋斌,张元吉,屈克庆,等(Zhao Jinbin,Zhang Yuanji,Qu Keqing,et al).单相LCL并网逆变器控制策略综述(Overview of control strategy for single-phase grid-connected inverter with LCL filter)[J].电工技术学报(Transactions of China Electrotechnical Society),2013,28(10):134-142.
[7] Komurcugil H,Kukrer O. Investigation of active damping methods for model-based-current-control scheme of singlephase grid-tied VSI with LCL filter[C]//43rd Annual Conference of the IEEE Industrial Electronics Society. Beijing,China,2017:1261-1266.
[8] Mohamed Y A R I,Rahman M A,Seethapathy R. Robust line-voltage sensorless control and synchronization of LCL-filtered distributed generation inverters for high power quality grid connection[J]. IEEE Trans on Power Electronics,2012,27(1):87-98.
[9] Dannehl J,Fuchs F W,Hansen S,et al. Investigation of active damping approaches for PI-based current control of grid-connected pulse width modulation converters with LCL filters[J]. IEEE Trans on Industry Applications,2010,46(4):1509-1517.
[10]王学华,阮新波,刘尚伟(Wang Xuehua,Ruan Xinbo,Liu Shangwei).抑制电网背景谐波影响的并网逆变器控制策略(Control strategy for grid-connected inverter to suppress current distortion effected by background harmonics in grid voltage)[J].中国电机工程学报(Proceedings of the CSEE),2011,31(6):7-14.
[11] He Jinwei,Li Yunwei. Generalized closed-loop control schemes with embedded virtual impedances for voltage source converters with LC or LCL filters[J]. IEEE Trans on Power Electronics,2012,27(4):1850-1861.
[12] Dannehl J,Fuchs F W,Thogersen P B. PI state space current control of grid-connected PWM converters with LCL filters[J]. IEEE Trans on Power Electronics,2010,25(9):2320-2330.
[13]许津铭,谢少军,肖华锋(Xu Jinming,Xie Shaojun,Xiao Huafeng). LCL滤波器有源阻尼控制机制研究(Research on control mechanism of active damping for LCL filters)[J].中国电机工程学报(Proceedings of the CSEE),2012,32(9):27-33.
[14]殷进军(Yin Jinjun). LCL滤波并网逆变器的数字单环控制技术研究(Study on Digital Single-Loop Control Scheme of Grid-Connected Inverters with LCL Filter)[D].武汉:华中科技大学电气与电子工程学院(Wuhan:College of Electrical&Electronic Engineering,Huazhong University of Science and Technology),2012.
[15]殷进军,刘邦银,段善旭(Yin Jinjun,Liu Bangyin,Duan Shanxu). LCL滤波并网逆变器双环控制参数设计与优化(Parameters design and optimization of dual-loop controller for grid-connected inverters with LCL filters)[J].电力系统自动化(Automation of Electric Power Systems),2013,37(9):123-128.
[16]姚志垒,王赞,肖岚,等(Yao Zhilei,Wang Zan,Xiao Lan,et al).一种新的逆变器并网控制策略的研究(Research on a novel grid-connected control strategy of inverter)[J].中国电机工程学报(Proceedings of the CSEE),2006,26(18):61-64.
[17]鲍陈磊,阮新波,王学华,等(Bao Chenlei,Ruan Xinbo,Wang Xuehua,et al).基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计(Design of grid-connected inverters with LCL filter based on PI regulator and capacitor current feedback active damping)[J].中国电机工程学报(Proceedings of the CSEE),2012,32(25):133-142.
[18]许津铭,谢少军,张斌锋(Xu Jinming,Xie Shaojun,Zhang Binfeng).分布式发电系统中LCL滤波并网逆变器电流控制研究综述(Overview of current control techniques for grid-connected inverters with LCL filters in distributed power generation systems)[J].中国电机工程学报(Proceedings of the CSEE),2015,35(16):4153-4166.
[19] Liu Fei,Zhou Yan,Duan Shanxu,et al. Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter[J]. IEEE Trans on Industrial Electronics,2009,56(11):4483-4491.
[20] Bao Chenlei,Ruan Xinbo,Wang Xuehua,et al. Step-bystep controller design for LCL-type grid-connected inverterwithcapacitorcurrent-feedbackactive-damping[J].IEEE Trans on Power Electronics,2014,29(3):1239-1253.
[21] Q/GDW 617—2011,国家电网公司光伏电站接入电网技术规定[S].
[2]张宁云(Zhang Ningyun). LCL型单相光伏并网逆变器电流控制与有源阻尼控制技术研究(Study on the Injected Current Control and Active Damping Control of Grid-Connected Single Photovoltaic Inverter with LCL Filter)[D].上海:上海交通大学电子信息与电气工程学院(Shanghai:School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University),2015.
[3]谢少军,许津铭(Xie Shaojun,Xu Jinming). LCL滤波并网逆变器的电流控制技术研究综述(Overview of current control strategy for grid-tied inverters with LCL filters)[J].电源学报(Journal of Power Supply),2012(4):1-6,18.
[4] Nardi C,Stein C M O,Carati E G,et al. A methodology of LCL filter design for grid-tied power converters[C]//IEEE13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference. Fortaleza,Brazil,2015.
[5]汪英,周乐明(Wang Ying,Zhou Leming). LCL型并网逆变器的GCFAD优化设计方法(Optimized design method of grid current feedback active damping for LCL-type grid-connected inverter)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(10):130-137.
[6]赵晋斌,张元吉,屈克庆,等(Zhao Jinbin,Zhang Yuanji,Qu Keqing,et al).单相LCL并网逆变器控制策略综述(Overview of control strategy for single-phase grid-connected inverter with LCL filter)[J].电工技术学报(Transactions of China Electrotechnical Society),2013,28(10):134-142.
[7] Komurcugil H,Kukrer O. Investigation of active damping methods for model-based-current-control scheme of singlephase grid-tied VSI with LCL filter[C]//43rd Annual Conference of the IEEE Industrial Electronics Society. Beijing,China,2017:1261-1266.
[8] Mohamed Y A R I,Rahman M A,Seethapathy R. Robust line-voltage sensorless control and synchronization of LCL-filtered distributed generation inverters for high power quality grid connection[J]. IEEE Trans on Power Electronics,2012,27(1):87-98.
[9] Dannehl J,Fuchs F W,Hansen S,et al. Investigation of active damping approaches for PI-based current control of grid-connected pulse width modulation converters with LCL filters[J]. IEEE Trans on Industry Applications,2010,46(4):1509-1517.
[10]王学华,阮新波,刘尚伟(Wang Xuehua,Ruan Xinbo,Liu Shangwei).抑制电网背景谐波影响的并网逆变器控制策略(Control strategy for grid-connected inverter to suppress current distortion effected by background harmonics in grid voltage)[J].中国电机工程学报(Proceedings of the CSEE),2011,31(6):7-14.
[11] He Jinwei,Li Yunwei. Generalized closed-loop control schemes with embedded virtual impedances for voltage source converters with LC or LCL filters[J]. IEEE Trans on Power Electronics,2012,27(4):1850-1861.
[12] Dannehl J,Fuchs F W,Thogersen P B. PI state space current control of grid-connected PWM converters with LCL filters[J]. IEEE Trans on Power Electronics,2010,25(9):2320-2330.
[13]许津铭,谢少军,肖华锋(Xu Jinming,Xie Shaojun,Xiao Huafeng). LCL滤波器有源阻尼控制机制研究(Research on control mechanism of active damping for LCL filters)[J].中国电机工程学报(Proceedings of the CSEE),2012,32(9):27-33.
[14]殷进军(Yin Jinjun). LCL滤波并网逆变器的数字单环控制技术研究(Study on Digital Single-Loop Control Scheme of Grid-Connected Inverters with LCL Filter)[D].武汉:华中科技大学电气与电子工程学院(Wuhan:College of Electrical&Electronic Engineering,Huazhong University of Science and Technology),2012.
[15]殷进军,刘邦银,段善旭(Yin Jinjun,Liu Bangyin,Duan Shanxu). LCL滤波并网逆变器双环控制参数设计与优化(Parameters design and optimization of dual-loop controller for grid-connected inverters with LCL filters)[J].电力系统自动化(Automation of Electric Power Systems),2013,37(9):123-128.
[16]姚志垒,王赞,肖岚,等(Yao Zhilei,Wang Zan,Xiao Lan,et al).一种新的逆变器并网控制策略的研究(Research on a novel grid-connected control strategy of inverter)[J].中国电机工程学报(Proceedings of the CSEE),2006,26(18):61-64.
[17]鲍陈磊,阮新波,王学华,等(Bao Chenlei,Ruan Xinbo,Wang Xuehua,et al).基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计(Design of grid-connected inverters with LCL filter based on PI regulator and capacitor current feedback active damping)[J].中国电机工程学报(Proceedings of the CSEE),2012,32(25):133-142.
[18]许津铭,谢少军,张斌锋(Xu Jinming,Xie Shaojun,Zhang Binfeng).分布式发电系统中LCL滤波并网逆变器电流控制研究综述(Overview of current control techniques for grid-connected inverters with LCL filters in distributed power generation systems)[J].中国电机工程学报(Proceedings of the CSEE),2015,35(16):4153-4166.
[19] Liu Fei,Zhou Yan,Duan Shanxu,et al. Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter[J]. IEEE Trans on Industrial Electronics,2009,56(11):4483-4491.
[20] Bao Chenlei,Ruan Xinbo,Wang Xuehua,et al. Step-bystep controller design for LCL-type grid-connected inverterwithcapacitorcurrent-feedbackactive-damping[J].IEEE Trans on Power Electronics,2014,29(3):1239-1253.
[21] Q/GDW 617—2011,国家电网公司光伏电站接入电网技术规定[S].