江渝;姜琦;黄敏;梁波;

• 1:输配电装备及系统安全与新技术国家重点实验室(重庆大学)

摘要(Abstract)：

在传统的光伏LCL并网逆变系统中,直流侧电压只有大于其最小需求电压时,逆变器才能有效控制并网电流,而最小需求电压随电网电压的增加而增加。为此需在单级逆变系统中串联多块光伏电池以提高其直流侧电压,但这提高了光伏并网发电系统的应用门槛。对此提出一种新型的LCL并网逆变系统及其控制方法,该逆变系统对并网电流有较强的控制能力,对逆变器直流侧电压没有要求,且电网电压对其控制能力也没有影响。与传统LCL电路相比,新型LCL电路同样具有较好的滤波效果。在控制系统中利用基波分量提取环节增加系统阻尼,提高系统稳定性;根据光伏电池的直流电压、电流和2次脉动电压、电流判断光伏的最大功率点;通过控制并网电流使光伏电池工作在最大功率状态。仿真结果验证了所提系统结构及其控制方法的正确性。

关键词(KeyWords)： 单相单级;并网;光伏逆变器;最大功率点跟踪

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 江渝;姜琦;黄敏;梁波;

Email:

DOI: 10.13335/j.1000-3673.pst.2015.02.003

参考文献(References)：

• [1]黄伟,孙昶辉,吴子平,等.含分布式发电系统的微网技术研究综述[J].电网技术,2009,33(9):14-18.Huang Wei,Sun Changhui,Wu Ziping,et al.A review on microgrid technology containing distributed generation system[J].Power Systems Technology,2009,33(9):14-18(in Chinese).
• [2]许洪华.中国光伏发电技术发展研究[J].电网技术,2007,31(20):77-81.Xu Honghua.The study on development of PV technology in China[J].Power Systems Technology,2007,31(20):77-81(in Chinese).
• [3]曾正,赵荣祥,汤胜清,等.可再生能源分散接入用先进并网逆变器研究综述[J].中国电机工程学报,2013,33(24):1-13.Zeng Zheng,Zhao Rongxiang,Tang Shengqing,et al.An overview on advanced grid-connected inverters used for decentralized renewable energy resources[J].Proceedings of the CSEE,2013,33(24):1-13(in Chinese).
• [4]陈树勇,鲍海,吴春洋,等.分布式光伏发电并网功率直接控制方法[J].中国电机工程学报,2011,31(10):6-11.Chen Shuyong,Bao Hai,Wu Chunyang,et al.Direct grid-tie power control method for distributed photovoltaic generation[J].Proceedings of the CSEE,2011,31(10):6-11(in Chinese).
• [5]Chen Y,Smedley K M.A cost-effective single-stage inverter with maximum power point tracking[J].IEEE Transactions on Power Electronics,2004,19(5):1289-1294.
• [6]Yazdani A,Fazio A R D,Ghoddami H,et al.Modeling guidelines and a benchmark for power system simulation studies of three-phase single-stage photovoltaic systems[J].IEEE Transactions on Power Delivery,2011,26(2):1247-1263.
• [7]周林,张林强,廖波,等.单相光伏逆变器控制技术研究[J].电网技术,2012,36(9):25-30.Zhou Lin,Zhang Linqiang,Liao Bo,et al.Research on control strategy of single-phase photovoltaic inverter[J].Power System Technology,2012,36(9):25-30(in Chinese).
• [8]马琳.无变压器结构光伏并网逆变器拓扑及控制研究[D].北京:北京交通大学,2011.
• [9]古俊银,陈国呈.单级式光伏并网逆变器的无电流检测MPPT方法[J].中国电机工程学报,2012,32(27):149-153.Gu Junyin,Chen Guocheng.A current-sensor-less MPPT algorithm for single-stage grid-connected PV inverters[J].Proceedings of the CSEE,2012,32(27):149-153(in Chinese).
• [10]杨仁增,张光先.单级式光伏并网逆变器的非线性控制[J].电工技术学报,2013,28(8):204-211.Yang Renzeng,Zhang Guangxian.Single-stage grid-connected PV inverter with nonlinear controller[J].Transactions of China Electrotechnical Society,2013,28(8):204-211(in Chinese).
• [11]仇志凌.基于LCL滤波器的三相三线并网变流器若干关键技术研究[D].杭州:浙江大学,2009.
• [12]Shi X J,Wang Z Q,Ma Y W,et al.Modeling and control of an LCL filter based three-phase active rectifier in grid emulator[C]//Applied Power Electronics Conference and Exposition.Long Beach,USA:IEEE,2013:17-21.
• [13]Twining E,Holmes D G.Grid current regulation of a three-phase voltage source inverter with an LCL input filter[J].IEEE Transactions on Power Electronics,2003,18(3):888-895.
• [14]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.Full grid voltage feed-forward control strategy with inverter-side current feedback for LCL grid-connected inverter[J].Proceedings of the CSEE,2013,33(6):54-60(in Chinese).
• [15]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 grid-connected inverters by splitting the capacitor of LCL filter[J].Proceedings of the CSEE,2008,28(18):36-41(in Chinese).
• [16]Shen Guoqiao,Zhu Xuancai,Zhang Jun,et al.A new feedback method for PR current control of LCL-filter-based grid-connected inverter[J].IEEE Transactions on Industrial Electronics,2010,57(6):2033-2041.
• [17]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 Zhiying,Xu Aiguo,Xie Shaojun.Dual-loop grid current control technique for grid-connected inverter using an LCL filter[J].Proceedings of the CSEE,2009,29(27):36-41(in Chinese).
• [18]鲍薇,胡学浩,何国庆,等.分布式电源并网标准研究[J].电网技术,2012,36(11):46-52.Bao Wei,Hu Xuehao,He Guoqing,et al.Study on standard for grid-integration of distributed resources[J].Power System Technology,2012,36(11):46-52(in Chinese).
• [19]刘飞,查晓明,段善旭,等.三相并网逆变器LCL滤波器的参数设计与研究[J].电工技术学报,2010,25(3):110-116.Liu Fei,Zha Xiaoming,Duan Shanxu,et al.Design and research on parameter of LCL filter in three-phase grid-connected inverter[J].Transactions of China Electrotechnical Society,2010,25(3):110-116(in Chinese).
• [20]Shen G Q,Xu D H,Xi D J,et al.An improved control strategy for grid-connected voltage source inverters with a LCL filter[C]//Applied Power Electronics Conference and Exposition.Dallas,USA:IEEE,2006:19-23.
• [21]Jia Y Q,Zhao J Q,Fu X W.Direct grid current control of LCL-filtered grid-connected inverter mitigating grid voltage disturbance[J].IEEE Transactions on Power Electronics,2014,29(3):1532-1541.
• [22]尹靖元,金新民,吴学智,等.基于带通滤波器的LCL型滤波器有源阻尼控制[J].电网技术,2013,37(8):2376-2382.Yi Jingyuan,Jin Xinmin,Wu Xuezhi,et al.Active damping control strategy for LCL filter based on band pass filter[J].Power System Technology,2013,37(8):2376-2382(in Chinese).
• [23]王恒.电压/电流模式单相逆变系统模式自适应及并网控制研究[D].重庆:重庆大学,2013.
• [24]江渝,林泽科,刘和平,等.变压器式可控电抗器在线状态的控制方案[J].重庆大学学报,2010,33(1):67-72.Jiang Yu,Lin Zeke,Liu Heping,et al.A novel control method for controllable reactor of transformer type[J].Journal of Chongqing University,2010,33(1):67-72(in Chinese).
• [25]Stala R,Koska K,Stawiarski L.Realization of modified ripple-based mppt in a single-phase single-stage grid-connected photovoltaic system[C]//IEEE International Symposium on Industrial Electronics.Gdansk,Poland:IEEE,2011:1106-1111.
• [26]Brunton S L,Rowley C W,Kulkarni S R,et al.Maximum power point tracking for photovoltaic optimization using extremum seeking[C]//IEEE Photovoltaic Specialists Conference.Philadelphia,USA:IEEE,2009:13-16.
• [27]刘东冉,陈树勇,马敏,等.光伏发电系统模型综述[J].电网技术,2011,35(8):47-52.Liu Dongran,Chen Shuyong,Ma Min,et al.A review on models for photovoltaic generation system[J].Power System Technology,2011,35(8):47-52(in Chinese).