基于综合阻抗的孤岛检测新方法
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摘要
以单极式光伏逆变器并网系统为研究对象,将阻抗的概念进行扩展,提出一种基于公共耦合点(PCC)综合阻抗的被动孤岛检测方法,利用快速傅里叶变换提取出电压、电流的实时信号,通过识别PCC处综合阻抗的变化状态,来区分正常、孤岛现象。仿真结果表明:所提孤岛检测方法能快速、有效地检测出孤岛,且不会影响逆变器输出电能质量。
The grid-connected system of single-pole photovoltaic inverter is taken as the research object,the concept of impedance is expanded,and a passive islanding detection method based on the common coupling point(PCC)comprehensive impedance is proposed. The real-time signals of voltage and current are extracted by fast Fourier transform. By identifying the change state of the comprehensive impedance at the PCC point,the phenomenon of normal and isolated island is distinguished. The simulation results show that the isolated island detection method can quickly and effectively detect the isolated island,and does not affect the output power quality of the inverter.
The grid-connected system of single-pole photovoltaic inverter is taken as the research object,the concept of impedance is expanded,and a passive islanding detection method based on the common coupling point(PCC)comprehensive impedance is proposed. The real-time signals of voltage and current are extracted by fast Fourier transform. By identifying the change state of the comprehensive impedance at the PCC point,the phenomenon of normal and isolated island is distinguished. The simulation results show that the isolated island detection method can quickly and effectively detect the isolated island,and does not affect the output power quality of the inverter.
引文
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[14]张晓莉,薛家祥,崔龙斌,等.周期性扰动AFDPF方法在光伏并网系统孤岛检测中的应用[J].电子技术应用,2012,38(5):65-67.[14]Zhang Xiaoli,Xue Jiaxiang,Cui Longbin,et al.Application of periodic perturbation AFDPF method in isolation of photovoltaic grid-grid system[J].Power Supply Technology and Its Application,2012,38(5):65-67.
[15]周洁.分布式并网发电系统孤岛检测方法研究[D].南京:南京邮电大学,2013.[15]Zhou Jie.Research on islanding detection method of distributed grid-connected generation system[D].Nanjing:Nanjing University of Posts and Telecommunications,2013.
[16]刘芙蓉.并网型户用光伏系统的孤岛检测技术研究[D].武汉:华中科技大学,2008.[16]Liu Furong.Study on island detection technology of gridconnected photovoltaic system[D].Wuhan:Huazhong University of Science and Technology,2008.
[17]张兴,曹仁贤.太阳能光伏并网发电及其逆变控制[M].北京:机械工业出版社,2009.[17]Zhang Xing,Cao Renxian.Photovoltaic grid-connected generation and its inverter control[M].Beijing:China Machine Press,2009.
[2]Ku Ahmad K N E,Selvaraj J,Rahim N A.A review of the islanding detection methods in grid-connected PVinverters[J].Renewable and Sustainable Energy,2013,5(21):756-766.
[3]褚晓丽.光伏并网中的孤岛效应研究[D].合肥:合肥工业大学,2009.[3]Zhu Xiaoli.Study on islanding effect in grid-connected photovoltaic system[D].Hefei:Hefei University of Technology,2009.
[4]Jang Sung-Il,Kim Kwang-Ho.An islanding detection method for distributed generations using voltage unbalance and total harmonic distortion of current[J].IEEE Trans on Power Delivery,2004,19(2):745-752.
[5]青桃,汪颖,江智军,等.光伏发电系统并网点谐波电压波动特征孤岛检测法[J].电力系统保护与控制,2013,41(12):9-14.[5]Qing Tao,Wang Ying,Jiang Zhijun,et al.An islanding detection method for photovoltaic power generation system using fluctuation characteristic of point of common coupling harmonic voltag[J].Power System Protection and Control,2013,41(12):9-14.
[6]侯梅毅,高厚磊,刘炳旭,等.基于相位偏移的孤岛检测新方法[J].电力自动化设备,2009,29(11):22-25.[6]Hou Meiyi,Gao Houlei,Liu Bingxu,et al.Islanding detection method based on phase shift[J].Electric Power Automation Equipment,2009,29(11):22-25.
[7]Ye Zhihong,Kolwalkar A,Zhang Yu,et al.Evaluation of anti-islanding sehemes based on nondetection zone concept[J].IEEE Transactions on Power Electronies,2004,19(5):1171-1176.
[8]Ropp M E,Begovic M,Rohatgi A.Prevention of islanding ingrid-connected photovoltaic systems[J].Progress in Photovoltaics,1999,7(1):39-59.
[9]Francesco D M,Marco L,Alberto P.Overview of antiislanding algorithms for PV systems[A].Proceedings of12th International Conference on Power Electronics and Motion Control Portoroz[C],Slovenia,2007.
[10]王立乔,孙孝峰.分布式发电系统中的光伏发电技术[M].北京:机械工业出版社,2010.[10]Wang Liqiao,Sun Xiaofeng.Photovoltaic generation technology in distributed generation system[M].Beijing:China Machine Press,2010.
[11]张凯航,袁越,傅质馨.带频率正反馈的无功电流扰动孤岛检测方法[J].电力系统及其自动化学报,2013,25(1):96-101.[11]Zhang Kaihang,Yuan Yue,Fu Zhixin.Reactive current disturbance islanding detection method with frequency positive feedb[J].Proceedings of the CSU-EPSA,2013,25(1):96-101.
[12]龚会茹,易灵芝,沈建飞,等.光伏并网系统中的新型孤岛检测方法[J].电力系统及其自动化学报,2012,24(1):59-65.[12]Gong Huiru,Yi Lingzhi,Shen Jianfei,et al.New island detection method of PV grid-connect-ed system[J].Proceedings of the CSU-EPSA,2012,24(1):59-65.
[13]何军,赵钢.改进型主动式频率偏移孤岛检测算法分析[J].电测与仪表,2013,50(3):41-44.[13]He Jun,Zhao Gang.Analysis of improved AFD for island detection[J].Electrical Measurement&Instrumentation,2013,50(3):41-44.
[14]张晓莉,薛家祥,崔龙斌,等.周期性扰动AFDPF方法在光伏并网系统孤岛检测中的应用[J].电子技术应用,2012,38(5):65-67.[14]Zhang Xiaoli,Xue Jiaxiang,Cui Longbin,et al.Application of periodic perturbation AFDPF method in isolation of photovoltaic grid-grid system[J].Power Supply Technology and Its Application,2012,38(5):65-67.
[15]周洁.分布式并网发电系统孤岛检测方法研究[D].南京:南京邮电大学,2013.[15]Zhou Jie.Research on islanding detection method of distributed grid-connected generation system[D].Nanjing:Nanjing University of Posts and Telecommunications,2013.
[16]刘芙蓉.并网型户用光伏系统的孤岛检测技术研究[D].武汉:华中科技大学,2008.[16]Liu Furong.Study on island detection technology of gridconnected photovoltaic system[D].Wuhan:Huazhong University of Science and Technology,2008.
[17]张兴,曹仁贤.太阳能光伏并网发电及其逆变控制[M].北京:机械工业出版社,2009.[17]Zhang Xing,Cao Renxian.Photovoltaic grid-connected generation and its inverter control[M].Beijing:China Machine Press,2009.