基于LCL滤波的单相并网逆变器的设计
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摘要
并网逆变器作为发电系统和电网连接的核心装置,直接影响整个并网发电系统的性能,已成为国内外研究的热点。以单相全桥逆变器为研究对象,为更好地减小入网电流的总谐波失真,采用LCL型滤波器,具有更好的高频谐波抑制能力。控制策略使用双电流闭环控制,推导了控制方程,内环控制LCL滤波器中的电容电流,外环控制滤波后的电网侧电流,此控制方法使系统的稳定性和动态性能都得到了很好改善。设计了各元件的取值规则,建立了系统仿真模型,通过Matlab/Simulink仿真,证明了建立的单相并网逆变器可成功实现并网运行。
As the core device of the power generation system and grid connection, the grid-connected inverter directly affects the performance of the entire grid-connected power generation system, which has become a hot research topic in the world. The research uses a single-phase full-bridge inverter as the object, and adopts an LCL type filter, which has better high-frequency harmonic suppression capability. The paper uses a dual-current closed-loop control method to derive its control equation. The inner loop controls the capacitor current in the LCL filter device, and the outer loop controls the filtered grid side current. This control method improves the stability and dynamic performance of the system. The principle of the value of each component is designed in detail, and the system simulation model is built. The Matlab/Simulink simulation proves that the single-phase grid-connected inverter established in this paper can successfully realize grid-connected operation.
As the core device of the power generation system and grid connection, the grid-connected inverter directly affects the performance of the entire grid-connected power generation system, which has become a hot research topic in the world. The research uses a single-phase full-bridge inverter as the object, and adopts an LCL type filter, which has better high-frequency harmonic suppression capability. The paper uses a dual-current closed-loop control method to derive its control equation. The inner loop controls the capacitor current in the LCL filter device, and the outer loop controls the filtered grid side current. This control method improves the stability and dynamic performance of the system. The principle of the value of each component is designed in detail, and the system simulation model is built. The Matlab/Simulink simulation proves that the single-phase grid-connected inverter established in this paper can successfully realize grid-connected operation.
引文
[1] 刘冠楠.光伏发电并网技术的发展现状与展望[J].现代国企研究,2017(22):135.
[2] 许水源.光伏并网发电系统对电网的影响和对策研究[J].中国战略新兴产业,2017(48):226.
[3] 李舟.新能源并网发电系统的关键技术和发展趋势[J].科技视界,2017(2):269.
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[10] 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.
[11] 张涛.单相LCL滤波器的并网逆变器控制的研究[D].秦皇岛:燕山大学,2009:36-46.
[12] PARKER S G,MCGRATH B P,HOLMES D G.Regions of active damping control for LCL filters[C]//Energy Conversion Congress and Exposition.Raleigh:IEEE,2012:53-60.
[13] 江法洋,郑丽君,宋建成,等.LCL型并网逆变器重复双闭环控制方法[J].中国电机工程学报,2017,37(10):2944-2954.
[14] 王要强,吴凤江,孙力,等.带LCL输出滤波器的并网逆变器控制策略研究[J].中国电机工程学报,2011,31(12):34-39.
[15] CHEN X,WEI W,HU X F,et al.Research on LCL filter in three-phase grid-connected inverter and novel active damping control strategy[J].Transactions of China Electrotechnical Society,2014,29(6):71-78.
[16] 杨苓,罗安,陈燕东,等.LCL型逆变器的鲁棒延时补偿并网控制方法及其稳定性分析[J].电网技术,2015,39(11):3102-3108.
[2] 许水源.光伏并网发电系统对电网的影响和对策研究[J].中国战略新兴产业,2017(48):226.
[3] 李舟.新能源并网发电系统的关键技术和发展趋势[J].科技视界,2017(2):269.
[4] 孙佐.新能源并网发电系统的关键技术和发展趋势[J].池州学院学报,2010,24(3):31-35.
[5] 辛诚.基于DSP的光伏并网逆变器控制策略研究[D].广州:华南理工大学,2012:50-55.
[6] DU Z Q.Issue of distributed power supply is introduced into distribution network[J].Applied Mechanics and Materials,2015,3827(734):736-739.
[7] CHEN D,ZHANG J M,QIAN Z M.An improved repetitive control scheme for grid-connected inverter with frequency adaptive capability[J].IEEE Tran-sactions on Industrial Electronics,2013,60(20):814-823.
[8] WANG X F,BLAABJERG F,CHEN Z,et al.Resonance analysis in parallel voltage-controlled distributed generation inverters[C]//Applied Power Electronics Conference and Exposition.Long Beach:IEEE,2013:2977-2983.
[9] 孙继健,肖岚.基于单极性SPWM控制的并网逆变器的研究[J].电力电子技术,2011,45(1):71-73.
[10] 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.
[11] 张涛.单相LCL滤波器的并网逆变器控制的研究[D].秦皇岛:燕山大学,2009:36-46.
[12] PARKER S G,MCGRATH B P,HOLMES D G.Regions of active damping control for LCL filters[C]//Energy Conversion Congress and Exposition.Raleigh:IEEE,2012:53-60.
[13] 江法洋,郑丽君,宋建成,等.LCL型并网逆变器重复双闭环控制方法[J].中国电机工程学报,2017,37(10):2944-2954.
[14] 王要强,吴凤江,孙力,等.带LCL输出滤波器的并网逆变器控制策略研究[J].中国电机工程学报,2011,31(12):34-39.
[15] CHEN X,WEI W,HU X F,et al.Research on LCL filter in three-phase grid-connected inverter and novel active damping control strategy[J].Transactions of China Electrotechnical Society,2014,29(6):71-78.
[16] 杨苓,罗安,陈燕东,等.LCL型逆变器的鲁棒延时补偿并网控制方法及其稳定性分析[J].电网技术,2015,39(11):3102-3108.