基于FB7桥的光伏并网滑模控制策略
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摘要
提出了一种基于FB7桥三相光伏逆变器的改进型双闭环滑模控制策略。电压外环采用准滑模控制,电流内环采用改进型快速终端滑模控制,减小系统抖振的同时使系统状态在有限时间内收敛为零。该控制策略克服了传统双闭环PI控制抗干扰性、快速性较差的缺点,提高了系统的并网电流质量和抗干扰能力。Matlab/Simulink仿真实验结果表明,与传统双闭环PI控制策略相比,双闭环滑模控制策略可有效降低并网电流的THD,改善了并网电流的质量,同时提高了系统的动态响应速度和抗干扰能力。实验验证了提出的控制策略的准确性和可行性。
An improved double closed-loop sliding mode control strategy based on FB7 bridge three-phase photovoltaic inverter is proposed. The quasi-sliding mode control is used in the voltage outer loop and the improved fast terminal sliding mode control is used in the current inner loop to reduce the system chattering and make the system state converge to zero in a limited time. The control strategy overcomes the shortcomings of traditional double closed-loop PI control such as poor anti-jamming and poor quickness,and improves the quality of grid-connected current and anti-jamming ability of the system. The simulation results of MATLAB/Simulink show that compared with the traditional double closed-loop PI control strategy,the double closed-loop sliding mode control strategy can effectively reduce the THD of grid-connected current,improve the quality of grid-connected current,and improve the dynamic response speed and anti-interference ability of the system. The accuracy and feasibility of the proposed control strategy are verified.
An improved double closed-loop sliding mode control strategy based on FB7 bridge three-phase photovoltaic inverter is proposed. The quasi-sliding mode control is used in the voltage outer loop and the improved fast terminal sliding mode control is used in the current inner loop to reduce the system chattering and make the system state converge to zero in a limited time. The control strategy overcomes the shortcomings of traditional double closed-loop PI control such as poor anti-jamming and poor quickness,and improves the quality of grid-connected current and anti-jamming ability of the system. The simulation results of MATLAB/Simulink show that compared with the traditional double closed-loop PI control strategy,the double closed-loop sliding mode control strategy can effectively reduce the THD of grid-connected current,improve the quality of grid-connected current,and improve the dynamic response speed and anti-interference ability of the system. The accuracy and feasibility of the proposed control strategy are verified.
引文
[1]唐婷,石祥花,黄如海,等.非隔离型光伏并网逆变器漏电流抑制机理分析与改进[J].电力系统自动化,2013,37(18):25-31.
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[3]滕国飞,肖国春,张志波,等.采用重复控制的LCL型并网逆变器单闭环电流控制[J].中国电机工程学报,2013,33(24):13-21.
[4]朱炜锋,窦伟,徐正国,等.基于PI控制的三相光伏并网逆变器电流控制器设计[J].可再生能源,2009,27(2):55-58.
[5]陈素华.有限集预测控制减少三相电压源逆变器共模漏电流方法[J].电力系统保护与控制,2016,44(22):136-141.
[6]王印松,王姝媛,海日.基于PR调节器的并网型逆变器谐波抑制策略[J].电源技术,2016,40(1):184-188.
[7]邹叶,陈嵘,沈正斌,等.基于分数阶重复PI控制的并网逆变器设计[J].电源学报,2018,16(2):144-150.
[8]吴忠强,谢建平.带扰动观测器的网侧逆变器高阶终端滑模控制[J].电机与控制学报,2014,18(2):96-101.
[9]游国栋,李继生,侯勇,等.光伏LCL型并网逆变器的积分滑模容错控制策略[J].太阳能学报,2018,39(4):1008-1017.
[10] Chen Z Y,Luo A,Wang H J,et al. Adaptive sliding-mode voltage control for inverter operating in islanded mode in microgrid[J].International Journal of Electrical Power&Energy Systems,2015,66:133-143
[11]韦文杰.一种LCL型三相并网逆变器的控制器设计方法[J].电力电子技术,2015,49(3):72-75.
[12]满灿,王宝华. LCL型三相并网逆变器自适应控制策略及其参数设计[J].电力系统保护与控制,2017,45(14):134-142.
[13]赵晗彤,张建成.基于滑模控制的飞轮储能稳定光伏微网离网运行母线电压策略的研究[J].电力系统保护与控制,2016,44(16):36-42.
[14]揭飞,陈国定,钟引帆,等.带LCL滤波的单相逆变器滑模控制[J].太阳能学报,2017,38(4):1032-1038.
[15]刘建科,韩晨,于克锐,等.基于SVPWM光伏并网逆变器漏电流抑制研究[J].可再生能源,2016,34(9):1287-1292.
[2]郭小强.非隔离型三相FB7光伏逆变器研究[J].中国电机工程学报,2017,37(10):2955-2962.
[3]滕国飞,肖国春,张志波,等.采用重复控制的LCL型并网逆变器单闭环电流控制[J].中国电机工程学报,2013,33(24):13-21.
[4]朱炜锋,窦伟,徐正国,等.基于PI控制的三相光伏并网逆变器电流控制器设计[J].可再生能源,2009,27(2):55-58.
[5]陈素华.有限集预测控制减少三相电压源逆变器共模漏电流方法[J].电力系统保护与控制,2016,44(22):136-141.
[6]王印松,王姝媛,海日.基于PR调节器的并网型逆变器谐波抑制策略[J].电源技术,2016,40(1):184-188.
[7]邹叶,陈嵘,沈正斌,等.基于分数阶重复PI控制的并网逆变器设计[J].电源学报,2018,16(2):144-150.
[8]吴忠强,谢建平.带扰动观测器的网侧逆变器高阶终端滑模控制[J].电机与控制学报,2014,18(2):96-101.
[9]游国栋,李继生,侯勇,等.光伏LCL型并网逆变器的积分滑模容错控制策略[J].太阳能学报,2018,39(4):1008-1017.
[10] Chen Z Y,Luo A,Wang H J,et al. Adaptive sliding-mode voltage control for inverter operating in islanded mode in microgrid[J].International Journal of Electrical Power&Energy Systems,2015,66:133-143
[11]韦文杰.一种LCL型三相并网逆变器的控制器设计方法[J].电力电子技术,2015,49(3):72-75.
[12]满灿,王宝华. LCL型三相并网逆变器自适应控制策略及其参数设计[J].电力系统保护与控制,2017,45(14):134-142.
[13]赵晗彤,张建成.基于滑模控制的飞轮储能稳定光伏微网离网运行母线电压策略的研究[J].电力系统保护与控制,2016,44(16):36-42.
[14]揭飞,陈国定,钟引帆,等.带LCL滤波的单相逆变器滑模控制[J].太阳能学报,2017,38(4):1032-1038.
[15]刘建科,韩晨,于克锐,等.基于SVPWM光伏并网逆变器漏电流抑制研究[J].可再生能源,2016,34(9):1287-1292.