基于复合电流调节的单相LCL并网逆变器控制方法
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摘要
为了抑制并网逆变器LCL滤波器的谐振,减小双模式变流器因采用较大的输出滤波电容造成的基波电流跟踪误差和网侧电流畸变,提出了一种新型的加权电流控制方法用于单相微电网变流器的控制。首先,在虚拟坐标系下用比例积分谐振控制器提高加权电流的控制精度和动态响应。其次,考虑到传统的加权平均电流的控制不直接控制电网电流以及电网电流和加权平均电流之间的误差,提出了一种改进的电流前馈方法。该方法通过检测输出电流和网侧电流的低频误差构造出一个电流前馈项,从而有效地抑制了网侧电流控制的误差。仿真和实验验证了该控制方法的有效性。
In order to suppress the resonance of the grid connected inverter LCL filter and to reduce the fundamental current tracking error together with the grid side current distortions of dual-mode converters caused by adopting the large output filter capacitor, a new weighted average current control strategy is proposed for single-phase microgrid converters. Firstly, a PIR controller is developed in a virtual two-axis synchronous rotating reference frame in order to improve the current control accuracy and dynamic response. Secondly, an improved current feed-forward control method is proposed considering that traditional method doesn't control the grid current and the error between grid current and weighted average current directly. By detecting the low frequency error of the output current and the grid side current, a current feed forward is constructed, which can effectively restrain the error of the network side current control. Simulation and experimental results are given to show the effectiveness of the proposed approach.
In order to suppress the resonance of the grid connected inverter LCL filter and to reduce the fundamental current tracking error together with the grid side current distortions of dual-mode converters caused by adopting the large output filter capacitor, a new weighted average current control strategy is proposed for single-phase microgrid converters. Firstly, a PIR controller is developed in a virtual two-axis synchronous rotating reference frame in order to improve the current control accuracy and dynamic response. Secondly, an improved current feed-forward control method is proposed considering that traditional method doesn't control the grid current and the error between grid current and weighted average current directly. By detecting the low frequency error of the output current and the grid side current, a current feed forward is constructed, which can effectively restrain the error of the network side current control. Simulation and experimental results are given to show the effectiveness of the proposed approach.
引文
[1]刘文军,周龙,陈剑,等.LCL并网逆变器的电流双闭环控制[J].电力系统保护与控制,2016,44(17):52-57.LIU Wenjun,ZHOU Long,CHEN Jian,et al.Control method for grid-connected inverter with LCL filter by employing dual current closed-loops[J].Power System Protection and Control,2016,44(17):52-57.
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[4]金亮亮,周荔丹,姚钢,等.适用于并网逆变器的新型LCL滤波器[J].电力系统保护与控制,2016,44(11):1-8.JIN Liangliang,ZHOU Lidan,YAO Gang,et al.A novel LCL filter adopted in grid-connected inverter[J].Power System Protection and Control,2016,44(11):1-8.
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[8]王海松,王晗,张建文,等.LCL型并网逆变器的分裂电容无源阻尼控制[J].电网技术,2014,38(4):895-902.WANG Haisong,WANG Han,ZHANG Jianwen,et al.Split-capacitor passive damping control for LCL grid-connected inverter[J].Power System Technology,2014,38(4):895-902.
[9]段耀强,荆平,陈国富,等.统一电能质量调节器串联侧滤波器设计与有源阻尼控制策略[J].电网技术,2015,39(5):1405-1411.DUAN Yaoqiang,JING Ping,CHEN Guofu,et al.Design of series-side filter for unified power quality conditioner and active damping control strategy[J].Power System Technology,2015,39(5):1405-1411.
[10]TIMBUS A,LISERRE M,TEODORESCU R,et al.Evaluation of current controllers for distributed power generation systems[J].IEEE Transactions on Power Electronics,2009,24(3):654-664.
[11]TWINING E,HOLMES D G.Grid connected regulation of a three-phase voltage source inverter with an LCL input filter[J].IEEE Transactions on Power Electronics,2003,18(3):888-895.
[12]HE Ning,XU Dehong,ZHU Ye,et al.Weighted average current control in a three-phase grid inverter with an LCL filter[J].IEEE Transactions on Power Electronics,2013,28(6):2785-2797.
[13]HE Jinwei,LI Yunwei.An accurate deadbeat control method for grid-tied converter using weighted average current sensing[C]//Energy Conversion Congress and Exposition(ECCE):September 20-24,2015,Montreal,Canada:4194-4201.
[14]沈国桥,徐德鸿.LCL滤波并网逆变器的分裂电容法电流控制[J].中国电机工程学报,2008,28(18):36-41.SHEN Guoqiao,XU Dehong.Current control for gridconnected inverters by splitting the capacitor of LCL filter[J].Proceedings of the CSEE,2008,28(18):36-41.
[15]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):111-120.ZHOU Juan,ZHANG Yong,GENG Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):111-120.
[16]杨秋霞,梁雄国,郭小强,等.准谐振控制器在有源电力滤波器中的应用[J].电工技术学报,2009,24(7):171-176.YANG Qiuxia,LIANG Xiongguo,GUO Xiaoqiang,et al.Application of quasi resonant controller for active power filter[J].Transactions of China Electrotechnical Society,2009,24(7):171-176.
[17]陈炜,陈成,宋战锋,等.双馈风力发电系统双PWM变换器比例谐振控制[J].中国电机工程学报,2009,29(15):1-7.CHEN Wei,CHEN Cheng,SONG Zhanfeng,et al.Proportional-resonant control for dual PWM converter in doubly fed wind generation system[J].Proceedings of the CSEE,2009,29(15):1-7.
[2]PAN Donghua,RUAN Xinbo,BAO Chenlei,et al.Optimized controller design of LCL-type grid-connected inverter to achieve high robustness against grid-impedance variation[J].IEEE Transactions on Industrial Electronics,2015,62(3):1537-1547.
[3]田鹏,宣文华,牛益国.基于陷波控制的LCL型光伏并网逆变器谐波谐振抑制研究[J].电力系统保护与控制,2016,44(14):82-88.TIAN Peng,XUAN Wenhua,NIU Yiguo.Suppression of harmonic resonance for photovoltaic grid-connected inverter with LCL filter based on notch filter control[J].Power System Protection and Control,2016,44(14):82-88.
[4]金亮亮,周荔丹,姚钢,等.适用于并网逆变器的新型LCL滤波器[J].电力系统保护与控制,2016,44(11):1-8.JIN Liangliang,ZHOU Lidan,YAO Gang,et al.A novel LCL filter adopted in grid-connected inverter[J].Power System Protection and Control,2016,44(11):1-8.
[5]雷亚雄,李建文,李永刚.基于准PR调节器电流双闭环LCL三相并网逆变器控制[J].电力系统保护与控制,2014,42(12):44-50.LEI Yaxiong,LI Jianwen,LI Yonggang.Control strategy of three-phase LCL grid-connected inverter based on quasi-PR adjuster[J].Power System Protection and Control,2014,42(12):44-50.
[6]刘斌,王蒙蒙,黄凯伦,等.引入网侧电感电流修正量的LCL逆变控制器及其状态估计[J].电网技术,2016,40(2):556-562.LIU Bin,WANG Mengmeng,HUANG Kailun,et al.LCL Inverter controller with grid-side inductor current correction and its state estimation[J].Power System Technology,2016,40(2):556-562.
[7]李泽斌,罗安,田园,等.LCL型光伏并网逆变器电流内环控制方法[J].电网技术,2014,38(10):2772-2778.LI Zebin,LUO An,TIAN Yuan,et al.Inner current loop control method for photovoltaic grid-connected inverter with LCL filter[J].Power System Technology,2014,38(10):2772-2778.
[8]王海松,王晗,张建文,等.LCL型并网逆变器的分裂电容无源阻尼控制[J].电网技术,2014,38(4):895-902.WANG Haisong,WANG Han,ZHANG Jianwen,et al.Split-capacitor passive damping control for LCL grid-connected inverter[J].Power System Technology,2014,38(4):895-902.
[9]段耀强,荆平,陈国富,等.统一电能质量调节器串联侧滤波器设计与有源阻尼控制策略[J].电网技术,2015,39(5):1405-1411.DUAN Yaoqiang,JING Ping,CHEN Guofu,et al.Design of series-side filter for unified power quality conditioner and active damping control strategy[J].Power System Technology,2015,39(5):1405-1411.
[10]TIMBUS A,LISERRE M,TEODORESCU R,et al.Evaluation of current controllers for distributed power generation systems[J].IEEE Transactions on Power Electronics,2009,24(3):654-664.
[11]TWINING E,HOLMES D G.Grid connected regulation of a three-phase voltage source inverter with an LCL input filter[J].IEEE Transactions on Power Electronics,2003,18(3):888-895.
[12]HE Ning,XU Dehong,ZHU Ye,et al.Weighted average current control in a three-phase grid inverter with an LCL filter[J].IEEE Transactions on Power Electronics,2013,28(6):2785-2797.
[13]HE Jinwei,LI Yunwei.An accurate deadbeat control method for grid-tied converter using weighted average current sensing[C]//Energy Conversion Congress and Exposition(ECCE):September 20-24,2015,Montreal,Canada:4194-4201.
[14]沈国桥,徐德鸿.LCL滤波并网逆变器的分裂电容法电流控制[J].中国电机工程学报,2008,28(18):36-41.SHEN Guoqiao,XU Dehong.Current control for gridconnected inverters by splitting the capacitor of LCL filter[J].Proceedings of the CSEE,2008,28(18):36-41.
[15]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):111-120.ZHOU Juan,ZHANG Yong,GENG Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):111-120.
[16]杨秋霞,梁雄国,郭小强,等.准谐振控制器在有源电力滤波器中的应用[J].电工技术学报,2009,24(7):171-176.YANG Qiuxia,LIANG Xiongguo,GUO Xiaoqiang,et al.Application of quasi resonant controller for active power filter[J].Transactions of China Electrotechnical Society,2009,24(7):171-176.
[17]陈炜,陈成,宋战锋,等.双馈风力发电系统双PWM变换器比例谐振控制[J].中国电机工程学报,2009,29(15):1-7.CHEN Wei,CHEN Cheng,SONG Zhanfeng,et al.Proportional-resonant control for dual PWM converter in doubly fed wind generation system[J].Proceedings of the CSEE,2009,29(15):1-7.