LCL型光伏并网逆变器控制策略的研究
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摘要
阐述了传统的PI双环控制算法的优缺点,并在此基础上,分析了PIR控制器的优势,用PIR电流控制器代替传统的PI控制器,同时采用电容电流比例反馈的方法抑制LCL滤波器的谐振尖峰,并加入电压前馈控制,消除电网电压对控制系统的影响。对控制器的参数进行设置,在Matlab/Simulink环境下进行仿真,仿真结果表明,该方案抑制直流分量效果良好,抗电网扰动能力强,保证了并网电流和电网电压同频同相,实现了光伏逆变器只输出有功功率的目的,仿真验证了其有效性和可行性。
This research describes the advantage and disadvantage of the control strategy of PI traditional double-loop for single-phase photovoltaic grid-connected inverter,and on this basis,analyses the advantage of PIR controller,so that the PIR controller can substitute the PI controller.Simultaneously,the capacitance current proportional feedback,is used to control the resonance peak value of the LCL filter.At the same time,the voltage feed-forward control strategy has been used to remove the effect of the power grid voltage on the control system.Finally,the control parameters are set up,and the simulation model is emulated in the Matlab/Simulink environment,The simulation results indicate that the strategy can effectively suppress the DC component well,and it has high ability of anti-disturbance of the grid voltage,ensures that the grid-connected current can be fed to the grid in the way of unit power factor,that is to say the practicability and the effectiveness are verified.
This research describes the advantage and disadvantage of the control strategy of PI traditional double-loop for single-phase photovoltaic grid-connected inverter,and on this basis,analyses the advantage of PIR controller,so that the PIR controller can substitute the PI controller.Simultaneously,the capacitance current proportional feedback,is used to control the resonance peak value of the LCL filter.At the same time,the voltage feed-forward control strategy has been used to remove the effect of the power grid voltage on the control system.Finally,the control parameters are set up,and the simulation model is emulated in the Matlab/Simulink environment,The simulation results indicate that the strategy can effectively suppress the DC component well,and it has high ability of anti-disturbance of the grid voltage,ensures that the grid-connected current can be fed to the grid in the way of unit power factor,that is to say the practicability and the effectiveness are verified.
引文
[1]王翔.6kW单相光伏并网系统的研制[D].北京:北京交通大学,2012.WANG Xiang.Research on 6kW Single-Phase PV Grid-Connected System[D].Beijing:Beijing Jiaotong University,2012.
[2]陈晓燕.光伏产业国际竞争力研究[D].天津:南开大学,2010.CHEN Xiao-yan.Researching on the International Competitiveness of the Solar Industry[D].Tianjin:Nankai University,2010.
[3]赵耀.基于分布式电源的微网控制及运行优化研究[D].天津:南开大学,2013.ZHAO Yao.Research on Control and Operation Optimization of Microgrid Based on Distributed Generation[D].Tianjin:Nankai University,2013.
[4]陈东,张军明,钱照明.带LCL滤波器的并网逆变器单电流反馈控制策略[J].中国电机工程学报,2013,33(09):10-16+S2.CHEN Dong,ZHANG Jun-ming,QIAN Zhao-ming.Single Current Feedback Control Strategy for Grid-Connected Inverters with LCL Filters[J].Proceedings of the CSEE,2013,33(09):10-16+S2.
[5]王晓刚,张杰,王佳庆.LCL滤波的PWM整流器直接功率控制[J].电测与仪表,2012,49(06):72-76.WANG Xiao-gang,ZHANG Jie,WANG Jia-qing.Direct Power Control for PWM Rectifier with LCL Filter[J].Electrical Measurement&Instrumentation,2012,49(06):72-76.
[6]徐志英,许爱国,谢少军.采用LCL滤波器的并网逆变器双闭环入网电流控制技术[J].中国电机工程学报,2009,29(27):36-41.XU Zhi-ying,XU Ai-guo,XIE Shao-jun.Dual-Loop Grid Current Control Technique for Grid-Connected Inverter Using an LCL Filter[J].Proceedings of the CSEE,2009,29(27):36-41.
[7]王翔,郝瑞祥,王剑.变压器直流偏磁对光伏并网逆变器的影响及抑制方法[J].电工技术学报,2013,28(12):237-244.WANG Xiang,HAO Rui-xiang,WANG Jian.Research on the Impact of Transformer DC Bias on PV Grid-connected Inverter and Restraining Method[J].Transactions of China Electrotechnical Society,2013,28(12):237-244.
[8]王德玉,吴俊娟,郭小强,等.单相光伏并网逆变器PDFI控制技术研究[J].电力电子技术,2012,46(05):52-53.WANG De-yu,WU Jun-juan,GUO Xiao-qiang,et al.Research on PDFI Control for Single-Phase PV Grid-Connected Inverter[J].Power Electronics,2012,46(05):52-53.
[9]王秀云,毛瑞鹏,田壁源,等.基于PI与准PR联合控制的光伏并网电流优化[J].电力系统保护与控制,2017,45(07):121-125.WANG Xiu-yun,MAO Rui-peng,TIAN Bi-yuan,et al.Optimal Control of Photovoltaic Grid-Connected Current Based on PI and Quasi-PR Control[J].Power System Protection and Control,2017,45(07):121-125.
[10]阮新波,王学华,潘东华,等.LCL型并网逆变器的控制技术[M].北京:科学出版社,2015.RUAN Xin-bo,WANG Xue-hua,PAN Dong-hua,et al.Control Techniques for LCL-Type Grid-Connected Inverters[M].Beijing:Science Press,2015.
[11]刘斌,林小峰,张思敏,等.单相光伏并网逆变器网压滑模预测前馈控制[J].太阳能学报,2017,38(09):2385-2393.LIU Bin,LIN Xiao-feng,ZHANG Si-min,et al.Grid Voltage Sliding Mode Predictive Feed-Forward Control for SinglePhase Photovoltaic Grid-Connected Inverter[J].Acta Energiae Solaris Sinica,2017,38(09):2385-2393.
[2]陈晓燕.光伏产业国际竞争力研究[D].天津:南开大学,2010.CHEN Xiao-yan.Researching on the International Competitiveness of the Solar Industry[D].Tianjin:Nankai University,2010.
[3]赵耀.基于分布式电源的微网控制及运行优化研究[D].天津:南开大学,2013.ZHAO Yao.Research on Control and Operation Optimization of Microgrid Based on Distributed Generation[D].Tianjin:Nankai University,2013.
[4]陈东,张军明,钱照明.带LCL滤波器的并网逆变器单电流反馈控制策略[J].中国电机工程学报,2013,33(09):10-16+S2.CHEN Dong,ZHANG Jun-ming,QIAN Zhao-ming.Single Current Feedback Control Strategy for Grid-Connected Inverters with LCL Filters[J].Proceedings of the CSEE,2013,33(09):10-16+S2.
[5]王晓刚,张杰,王佳庆.LCL滤波的PWM整流器直接功率控制[J].电测与仪表,2012,49(06):72-76.WANG Xiao-gang,ZHANG Jie,WANG Jia-qing.Direct Power Control for PWM Rectifier with LCL Filter[J].Electrical Measurement&Instrumentation,2012,49(06):72-76.
[6]徐志英,许爱国,谢少军.采用LCL滤波器的并网逆变器双闭环入网电流控制技术[J].中国电机工程学报,2009,29(27):36-41.XU Zhi-ying,XU Ai-guo,XIE Shao-jun.Dual-Loop Grid Current Control Technique for Grid-Connected Inverter Using an LCL Filter[J].Proceedings of the CSEE,2009,29(27):36-41.
[7]王翔,郝瑞祥,王剑.变压器直流偏磁对光伏并网逆变器的影响及抑制方法[J].电工技术学报,2013,28(12):237-244.WANG Xiang,HAO Rui-xiang,WANG Jian.Research on the Impact of Transformer DC Bias on PV Grid-connected Inverter and Restraining Method[J].Transactions of China Electrotechnical Society,2013,28(12):237-244.
[8]王德玉,吴俊娟,郭小强,等.单相光伏并网逆变器PDFI控制技术研究[J].电力电子技术,2012,46(05):52-53.WANG De-yu,WU Jun-juan,GUO Xiao-qiang,et al.Research on PDFI Control for Single-Phase PV Grid-Connected Inverter[J].Power Electronics,2012,46(05):52-53.
[9]王秀云,毛瑞鹏,田壁源,等.基于PI与准PR联合控制的光伏并网电流优化[J].电力系统保护与控制,2017,45(07):121-125.WANG Xiu-yun,MAO Rui-peng,TIAN Bi-yuan,et al.Optimal Control of Photovoltaic Grid-Connected Current Based on PI and Quasi-PR Control[J].Power System Protection and Control,2017,45(07):121-125.
[10]阮新波,王学华,潘东华,等.LCL型并网逆变器的控制技术[M].北京:科学出版社,2015.RUAN Xin-bo,WANG Xue-hua,PAN Dong-hua,et al.Control Techniques for LCL-Type Grid-Connected Inverters[M].Beijing:Science Press,2015.
[11]刘斌,林小峰,张思敏,等.单相光伏并网逆变器网压滑模预测前馈控制[J].太阳能学报,2017,38(09):2385-2393.LIU Bin,LIN Xiao-feng,ZHANG Si-min,et al.Grid Voltage Sliding Mode Predictive Feed-Forward Control for SinglePhase Photovoltaic Grid-Connected Inverter[J].Acta Energiae Solaris Sinica,2017,38(09):2385-2393.