一种新型低畸变主动孤岛检测算法的研究
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摘要
孤岛检测是并网光伏逆变器保护电气设备和相关维修人员安全所必备的功能,要求其检测算法不仅具有较快的检测速度,而且还要尽量减少对电能质量的不良影响。传统的主动频移式孤岛检测算法行之有效,但是由于电流扰动量的存在,对其输出的电能质量影响较大。针对上述问题,通过对其扰动原理进行研究,提出一种新型主动频移式孤岛检测方案,该方案通过移相的方式实现频移。仿真结果表明,频移式新算法检测盲区小,与传统频移法相比总谐波畸变率降低了24.8%,检测速度提前了0.1 s。该算法在有效减少谐波畸变率的同时提高了检测速度,显著提高了注入电网的电能质量。
The islanding detection is a necessary function for photovoltaic grid-connected inverter to protect the electrical equipment and related maintenance personnel security,and its detection algorithm should have fast detection speed and active power quality effect.The traditional active frequency drift algorithm for islanding detection is effective,but its current disturbance quantity has a great influence on the output power quality.Aiming at the above problems,a new type of active frequency drift scheme for islanding detection is proposed by studying its disturbance principle,which can realize the frequency drift by means of phase drift.The simulation results show that the new frequency drift detection algorithm has small non-detection zone,its total harmonic distortion rate is reduced by 24.8% and the detection speed is 0.1 s improved than that of the traditional frequency drift method.The algorithm improves the detection speed while effectively reducing the harmonic distortion rate,and significantly improves the power quality of power grid.
The islanding detection is a necessary function for photovoltaic grid-connected inverter to protect the electrical equipment and related maintenance personnel security,and its detection algorithm should have fast detection speed and active power quality effect.The traditional active frequency drift algorithm for islanding detection is effective,but its current disturbance quantity has a great influence on the output power quality.Aiming at the above problems,a new type of active frequency drift scheme for islanding detection is proposed by studying its disturbance principle,which can realize the frequency drift by means of phase drift.The simulation results show that the new frequency drift detection algorithm has small non-detection zone,its total harmonic distortion rate is reduced by 24.8% and the detection speed is 0.1 s improved than that of the traditional frequency drift method.The algorithm improves the detection speed while effectively reducing the harmonic distortion rate,and significantly improves the power quality of power grid.
引文
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[10]张瑞叶.分布式并网光伏发电系统的孤岛检测技术[D].石家庄:河北师范大学,2014.ZHANG Ruiye.Islanding detection techniques on gridconnected distributed photovoltaic power generation system[D].Shijiazhuang:Hebei Normal University,2014.
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[12]刘芙蓉,康勇,王辉,等.主动移相式孤岛检测的一种改进的算法[J].电工技术学报,2010,25(3):172-176.LIU Furong,KANG Yong,WANG Hui,et al.An improved active phase-shift method for islanding detection[J].Transactions of China electrotechnical society,2010,25(3):172-176.
[13]JUNG Y,CHOI J,YU B,et al.A novel active frequency drift method of islanding prevention for the grid-connected photovoltaic inverter[C]//2005 IEEE Power Electronics Specialists Conference.Recife:IEEE,2005:1915-1921.
[14]IEEE Society.929-2000:IEEE recommended practice for utility interface of photovoltaic(PV)systems[S].US:IEEE Society,2000.
[2]程启明,王映斐,程尹曼,等.分布式发电并网系统中孤岛检测方法的综述研究[J].电力系统保护与控制,2011,39(6):147-154.CHENG Qiming,WANG Yingfei,CHENG Yinman,et al.Overview study on islanding detecting methods for distributed generation grid-connected system[J].Power system protection and control,2011,39(6):147-154.
[3]蒋翠,祁新梅,郑寿森.带电压频率正反馈的主动移频式孤岛检测方法[J].电力系统保护与控制,2014,42(8):95-100.JIANG Cui,QI Xinmei,ZHENG Shousen.Active frequency drift islanding detection with positive feedback of voltage frequency[J].Power system protection and control,2014,42(8):95-100.
[4]ROPP M E,BEGOVIC M,ROHATGI A.Prevention of islanding in grid-connected photovoltaic systems[J].IEEE transactions on energy conversion,1999,14(3):39-59.
[5]GE Y,SUN J,WANG G,et al.Improved active frequency drift anti-islanding detection method[C]//2015 International Conference on Materials Engineering and Information Technology Applications.[S.l.]:ACM,2015:1-6.
[6]YAFAOUI A,WU B,KOURO S.Improved active frequency drift anti-islanding detection method for grid connected photovoltaic systems[J].IEEE transactions on power electronics,2012,27(5):2367-2375.
[7]黎璋霞,罗晓曙,廖志贤,等.改进的正反馈主动频移式孤岛检测方法[J].电力系统及其自动化学报,2015,27(4):13-17.LI Zhangxia,LUO Xiaoshu,LIAO Zhixian,et al.Improved active frequency drift with positive feedback islanding detection method[J].Proceedings of the CUS-EPSA,2015,27(4):13-17.
[8]ROPP M E,BEGOVIC M,ROHATGI A,et al.Determining the relative effectiveness of islanding detection methods using phase criteria and nondetection zones[J].IEEE transactions on energy conversion,2000,15(3):290-296.
[9]邓燕妮,桂卫华.一种低畸变的主动移频式孤岛检测算法[J].电工技术学报,2009,24(4):219-223.DENG Yanni,GUI Weihua.An improved active frequencydrift method for islanding detection with low harmonics distortion[J].Transactions of China electrotechnical society,2009,24(4):219-223.
[10]张瑞叶.分布式并网光伏发电系统的孤岛检测技术[D].石家庄:河北师范大学,2014.ZHANG Ruiye.Islanding detection techniques on gridconnected distributed photovoltaic power generation system[D].Shijiazhuang:Hebei Normal University,2014.
[11]YAFAOUI A,WU B,KOURO S.Improved active frequency drift anti-islanding method with lower total harmonic distortion[C]//2010 IEEE Conference on Industrial Electronics Society.Glendale:IEEE,2010:3216-3221.
[12]刘芙蓉,康勇,王辉,等.主动移相式孤岛检测的一种改进的算法[J].电工技术学报,2010,25(3):172-176.LIU Furong,KANG Yong,WANG Hui,et al.An improved active phase-shift method for islanding detection[J].Transactions of China electrotechnical society,2010,25(3):172-176.
[13]JUNG Y,CHOI J,YU B,et al.A novel active frequency drift method of islanding prevention for the grid-connected photovoltaic inverter[C]//2005 IEEE Power Electronics Specialists Conference.Recife:IEEE,2005:1915-1921.
[14]IEEE Society.929-2000:IEEE recommended practice for utility interface of photovoltaic(PV)systems[S].US:IEEE Society,2000.