逆变器侧电流反馈的LCL型三相光伏并网逆变器解耦控制
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摘要
为了实现LCL型三相光伏并网逆变器dq轴的解耦控制,同时提高系统的动态响应速度,在同步旋转坐标系下,提出一种适用于逆变器侧电流反馈的前馈解耦控制策略。并在电压外环中引入光伏阵列功率前馈、电流内环中引入电网电压前馈。视各耦合项为扰动,采用闭环传递函数的求解方法以获取实现解耦控制的前馈系数,同时分析了滤波器参数在发生变化时其对dq轴解耦效果的影响。通过Matlab建立系统仿真模型,仿真结果表明:所提解耦控制策略使LCL型三相光伏并网逆变器不仅实现了dq轴的解耦控制,而且在保证强鲁棒性及高入网电流质量条件下具有良好的动、静态性能。
In order to realize the decoupling control of dq axis for three-phase PV grid-connected system and speed up the system dynamic response speed, a decoulpling control strategy is proposed in the synchronous rotating reference frame. Meanwhile, PV array power feed-forward and full grid-voltage feed-forward control are respectively introduced into the voltage outer loop and current inner loop. The coupling terms are considered as disturbances, and the feed-forward decoupling coefficients are obtained by solving the closed loop transfer function, and the decoupling effect of the dq axis is analyzed when the filter parameters change. The system simulation model is established by Matlab, the simulation results show the proposed control strategy makes the three-phase PV grid-connected inverter with LCL filter not only realize the decoupling control of dq axis, but also has good static and dynamic performance under the condition of the strong robustness and high grid current quality.
In order to realize the decoupling control of dq axis for three-phase PV grid-connected system and speed up the system dynamic response speed, a decoulpling control strategy is proposed in the synchronous rotating reference frame. Meanwhile, PV array power feed-forward and full grid-voltage feed-forward control are respectively introduced into the voltage outer loop and current inner loop. The coupling terms are considered as disturbances, and the feed-forward decoupling coefficients are obtained by solving the closed loop transfer function, and the decoupling effect of the dq axis is analyzed when the filter parameters change. The system simulation model is established by Matlab, the simulation results show the proposed control strategy makes the three-phase PV grid-connected inverter with LCL filter not only realize the decoupling control of dq axis, but also has good static and dynamic performance under the condition of the strong robustness and high grid current quality.
引文
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[8]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.
[9]靳伟,李永丽,孙广宇.基于有源阻尼的并网逆变器电流内环H∞重复控制[J].中国电机工程学报,2016,36(17):4685-4693.JIN Wei,LI Yongli,SUN Guangyu.H∞repetitive current controllers for grid-connected inverters based on active damping[J].Proceedings of the CSEE,2016,36(17):4685-4693.
[10]张学广,马彦,李瑞,等.两相静止坐标系下并网逆变器的重复控制策略[J].电工技术学报,2016,31(9):85-91.ZHANG Xueguang,MA Yan,LI Rui,et al.Repetitive control strategy for grid-connected converters in stationary frame[J].Transactions of China Electrotechnical Society,2016,31(9):85-91.
[11]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.
[12]屈克庆,李文旗,叶天凯,等.基于状态反馈的LCL型逆变器解耦控制策略[J].电工技术学报,2016,31(20):130-138.QU Keqing,LI Wenqi,YE Tiankai,et al.State feedback based decoupling control strategy for grid-connected inverter with LCL filter[J].Transactions of China Electrotechnical Society,2016,31(20):130-138.
[13]彭秋波,盘宏斌,刘勇,等.LCL型三相并网逆变器双闭环解耦控制器设计[J].电工技术学报,2014,29(4):103-110.PENG Qiubo,PAN Hongbin,LIU Yong,et al.Design of dual-loop decoupling controller in LCL three-phase grid-connected inverter[J].Transactions of China Electrotechnical Society,2014,29(4):103-110.
[14]包献文,卓放,谭佩喧.三相LCL型并网逆变器的模型分析及解耦控制[J].西安交通大学学报,2014,48(2):44-49.BAO Xianwen,ZHUO Fang,TAN Peixuan.Model analysis and decouple control strategy of three-phase grid-connected inverter with an LCL filter[J].Journal of Xi’an Jiaotong University,2014,48(2):44-49.
[15]吴云亚,谢少军,阚加荣,等.逆变器侧电流反馈的LCL并网逆变器电网电压前馈控制策略[J].中国电机工程学报,2013,33(6):54-60.WU Yunya,XIE Shaojun,KAN Jiarong,et al.A full grid voltage feed-forward control strategy with inverter-side current feedback for LCL grid-connected inverters[J].Proceedings of the CSEE,2013,33(6):54-60.
[16]许津铭,季林,葛小伟,等.计及逆变器侧电流反馈影响的LCL滤波器参数优化设计[J].中国电机工程学报,2016,36(17):4656-4664.XU Jinming,JI Lin,GE Xiaowei,et al.LCL-filter optimization design with consideration of inverter-side current feedback control impacts[J].Proceedings of the CSEE,2016,36(17):4656-4664.
[17]沈瑶,罗安,陈燕东,等.基于功率前馈的光伏并网控制方法及稳定性分析[J].电网技术,2014,38(9):2449-2454.SHEN Yao,LUO An,CHEN Yandong,et al.A power feedforward based control approach for grid-connection of photovoltaic generation and its stability analysis[J].Power System Technology,2014,38(9):2449-2454.
[2]邬明亮,戴朝华,邓惠文,等.基于单体光伏/单体储能电池模组的新型光伏储能发电系统[J].电力系统保护与控制,2017,45(3):56-61.WU Mingliang,DAI Chaohua,DENG Huiwen,et al.A novel PV energy storage generating system based on single PV cell/single energy storage cell module[J].Power System Protection and Control,2017,45(3):56-61.
[3]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.
[4]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.
[5]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.
[6]庄超,叶永强,赵强松,等.基于分裂电容法的LCL并网逆变器控制策略分析与改进[J].电工技术学报,2015,30(16):85-93.ZHUANG Chao,YE Yongqiang,ZHAO Qiangsong,et al.Analysis and improvement of the control strategy of LCL grid-connected inverter based on split-capacitor[J].Transactions of China Electrotechnical Society,2015,30(16):85-93.
[7]徐飞,汤雨,谷伟.弱电网条件下LCL型并网逆变器谐振前馈控制策略研究[J].中国电机工程学报,2016,36(18):4970-4979.XU Fei,TANG Yu,GU Wei.Resonant feedforward control strategy for LCL-type grid-connected inverters in weak grid condition[J].Proceedings of the CSEE,2016,36(18):4970-4979.
[8]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.
[9]靳伟,李永丽,孙广宇.基于有源阻尼的并网逆变器电流内环H∞重复控制[J].中国电机工程学报,2016,36(17):4685-4693.JIN Wei,LI Yongli,SUN Guangyu.H∞repetitive current controllers for grid-connected inverters based on active damping[J].Proceedings of the CSEE,2016,36(17):4685-4693.
[10]张学广,马彦,李瑞,等.两相静止坐标系下并网逆变器的重复控制策略[J].电工技术学报,2016,31(9):85-91.ZHANG Xueguang,MA Yan,LI Rui,et al.Repetitive control strategy for grid-connected converters in stationary frame[J].Transactions of China Electrotechnical Society,2016,31(9):85-91.
[11]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.
[12]屈克庆,李文旗,叶天凯,等.基于状态反馈的LCL型逆变器解耦控制策略[J].电工技术学报,2016,31(20):130-138.QU Keqing,LI Wenqi,YE Tiankai,et al.State feedback based decoupling control strategy for grid-connected inverter with LCL filter[J].Transactions of China Electrotechnical Society,2016,31(20):130-138.
[13]彭秋波,盘宏斌,刘勇,等.LCL型三相并网逆变器双闭环解耦控制器设计[J].电工技术学报,2014,29(4):103-110.PENG Qiubo,PAN Hongbin,LIU Yong,et al.Design of dual-loop decoupling controller in LCL three-phase grid-connected inverter[J].Transactions of China Electrotechnical Society,2014,29(4):103-110.
[14]包献文,卓放,谭佩喧.三相LCL型并网逆变器的模型分析及解耦控制[J].西安交通大学学报,2014,48(2):44-49.BAO Xianwen,ZHUO Fang,TAN Peixuan.Model analysis and decouple control strategy of three-phase grid-connected inverter with an LCL filter[J].Journal of Xi’an Jiaotong University,2014,48(2):44-49.
[15]吴云亚,谢少军,阚加荣,等.逆变器侧电流反馈的LCL并网逆变器电网电压前馈控制策略[J].中国电机工程学报,2013,33(6):54-60.WU Yunya,XIE Shaojun,KAN Jiarong,et al.A full grid voltage feed-forward control strategy with inverter-side current feedback for LCL grid-connected inverters[J].Proceedings of the CSEE,2013,33(6):54-60.
[16]许津铭,季林,葛小伟,等.计及逆变器侧电流反馈影响的LCL滤波器参数优化设计[J].中国电机工程学报,2016,36(17):4656-4664.XU Jinming,JI Lin,GE Xiaowei,et al.LCL-filter optimization design with consideration of inverter-side current feedback control impacts[J].Proceedings of the CSEE,2016,36(17):4656-4664.
[17]沈瑶,罗安,陈燕东,等.基于功率前馈的光伏并网控制方法及稳定性分析[J].电网技术,2014,38(9):2449-2454.SHEN Yao,LUO An,CHEN Yandong,et al.A power feedforward based control approach for grid-connection of photovoltaic generation and its stability analysis[J].Power System Technology,2014,38(9):2449-2454.