基于模糊控制的改进频移式孤岛检测方法
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摘要
针对孤岛检测中传统正反馈主动频移法的初始截断系数和反馈系数只能取固定值,导致的检测盲区大、检测时间长以及总谐波失真过高等问题,同时通过对主动频移法中施加的扰动量与公共耦合点电压频率关系的分析,提出一种改进的带正反馈主动频移式孤岛检测方法。利用模糊控制算法对反馈系数进行模糊化处理,并对反馈量做出基于三次幂函数的变换,建立起新的截断系数。与传统正反馈主动频移法相比,改进后的方法减小了检测盲区,缩短了检测时间,并且降低了总的谐波畸变率,提高了电能质量。最后利用MATLAB/Simulink平台对该方法进行了仿真验证。
For the initial truncation coefficient and feedback coefficient of the traditional active frequency drift with positive feedback method in islanding detection can only take a fixed value,resulting in large detection blind zone,long detection time and high total harmonic distortion. An improved frequency drift islanding detection method based on fuzzy control was proposed in this paper. By analyzing the relationship between the disturbance and the voltage of the common coupling point in the active frequency drifting method,fuzzy control algorithm was used to process the feedback coefficient,and the feedback quantity was transformed based on the third power function to establish a new truncation coefficient. Compared with the traditional positive feedback active frequency drifting method,the improved method has reduced the blind zone,shortened the detection time,reduced the total harmonic distortion rate,and improved the power quality successfully. Finally,the new method was verified by MATLAB/Simulink simulation platform.
For the initial truncation coefficient and feedback coefficient of the traditional active frequency drift with positive feedback method in islanding detection can only take a fixed value,resulting in large detection blind zone,long detection time and high total harmonic distortion. An improved frequency drift islanding detection method based on fuzzy control was proposed in this paper. By analyzing the relationship between the disturbance and the voltage of the common coupling point in the active frequency drifting method,fuzzy control algorithm was used to process the feedback coefficient,and the feedback quantity was transformed based on the third power function to establish a new truncation coefficient. Compared with the traditional positive feedback active frequency drifting method,the improved method has reduced the blind zone,shortened the detection time,reduced the total harmonic distortion rate,and improved the power quality successfully. Finally,the new method was verified by MATLAB/Simulink simulation platform.
引文
[1]程启明,王映斐,程尹曼.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. Overview study on islanding detecting methods for distributed generation grid-connected system[J]. Power System Protection and Control, 2011, 39(6):147-154.
[2]刘芙蓉,康勇,段善旭.主动移频式孤岛检测方法的参数优化[J].中国电机工程学报,2008,28(1):95-99.Liu Furong,Kang Yong,Duan Shanxu. Parameter optimization of active frequency drift islanding detection method[J]. Proceedings of the CSEE,2008,28(1):95-99.
[3]杨新华,孙艳军,汪龙伟.改进型正反馈主动频移孤岛检测方法的仿真研究[J].电气自动化,2015,37(2):47-50.Yang Xinhua,Sun Yanjun,Wang Longwei. Emulation research of the improved positive-feedback active frequency drift islanding detection[J]. Electrical Automation,2015,37(2):47-50.
[4]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.He Jun,Zhao Gang. Analysis of improved AFD for island detection[J]. Electrical Measurement&Instrumentation,2013,50(3):41-44.
[5]蔡逢煌,郑必伟,王武.结合同步锁相的光伏并网发电系统孤岛检测技术[J].电工技术学报,2012,27(10):202-206.Cai Fenghuang,Zheng Biwei,Wang Wu. Islanding detection method combined with PLL for photovoltaic grid-connected power system[J].Transactions of China Electrotechnical Society,2012,27(10):202-206.
[6]丁浩,何宇,漆汉宏.基于抛物线型SMS算法的孤岛检测[J].电工技术学报,2013,28(10):233-240.Ding Hao,He Yu,Qi Hanhong. A novel islanding detection based on parabolic SMS algorithm[J]. Transactions of China Electrotechnical Society,2013,28(10):233-240.
[7]付光杰,吕金淼.一种改进的正反馈主动频移式孤岛检测方法[J].自动化与仪器仪表,2017,(5):122-124.Fu Guangjie,Lv Jinmiao. An improved positive-feedback active frequency drift islanding detection method[J]. Automation&Instrumentation,2017,(5):122-124.
[8] Yafaoui Ahmad,Wu B,Kouro Samir. Improved active frequency drift anti-islanding detection method for grid connected photovoltaic systems[J]. IEEE Industrial Transactions Electronics Society,2012,27(5):2367-2375.
[9]王玉玲,刘秀芳,陈威.模糊控制在孤岛检测系统中的应用[J].可再生能源,2013,31(9):30-34.Wang Yuling,Liu Xiufang,Chen Wei. Application of fuzzy control for islanding detection method[J]. Renewable Energy Resources,2013,31(9):30-34.
[10]甘忠,李正天.一种新的分布式发电孤岛检测方法[J].电力系统保护与控制,2011,39(1):123-127.Gan Zhong,Li Zhengtian. A novel islanding detection method of distributed generations[J]. Power System Protection and Control,2011,39(1):123-127.
[11]张百乐,王久和.一种改进的正反馈主动移频孤岛检测方法[J].北京信息科技大学学报,2014,29(3):43-48.Zhang Baile,Wang Jiuhe. An improved active frequency-drift with positive feedback islanding detection method[J]. Journal of Beijing Information Science and Technology University,2014,29(3):43-48.
[12]黎璋霞,罗晓曙,廖志贤.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. Improved active frequency drift with positive feedback islanding detection method[J]. Proceedings of the CSU-EPSA,2015,27(4):13-17.
[13]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 frequency-drift method for islanding detection with low harmonics distortion[J]. Transactions of China Electrotechnical Society,2009,24(4):219-223.
[14]高金辉,程静,杨海波.光伏并网逆变器复合式孤岛检测方法[J].电力系统保护与控制,2012,40(11):122-126.Gao Jinhui,Cheng Jing,Yang Haibo. Composite islanding detection method of photovoltaic grid-connected inverter[J]. Power System Protection and Control,2012,40(11):122-126.
[15]刘方锐,余蜜,张宇.主动移频法在光伏并网逆变器并联运行下的孤岛检测机理研究[J].中国电机工程学报,2009,29(12):47-51.Liu Fangrui,Yu Mi,Zhang Yu. Islanding detection evaluation for active frquency drifting methods in multiple photovoltaic grid-connected converters[J]. Proceedings of the CSEE,2009,29(12):47-51.
[16]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 drifting islanding detection with positive feedback of voltage frequency[J]. Power System Protection and Control,2014,42(8):95-100.
[17]郑涛,袁飞,王燕萍.基于模糊控制的快速无盲区的频移式孤岛检测法[J].电力系统保护与控制,2014,42(23):38-43.Zheng Tao,Yuan Fei,Wang Yanping. A fast frequency drifts islandingdetecting method without non-detecting zone based on fuzzy control[J].Power System Protection and Control,2014,42(23):38-43.
[18]邹培源,黄纯.基于模糊控制的改进滑模频率偏移孤岛检测方法[J].电网技术,2017,41(2):574-580.Zou Peiyuan,Huang Chun. An improved slip mode frequency shift islanding detection method based on fuzzy control[J]. Power System Technology,2017,41(2):574-580.
[19]刘芙蓉,康勇,段善旭.一种有效的孤岛检测盲区描述方法[J].电工技术学报,2007,22(10):167-172.Liu Furong,Kang Yong,Duan Shanxu. A novel method for mapping non-detection zone[J]. Transactions of China Electrotechnical Society,2007,22(10):167-172.
[2]刘芙蓉,康勇,段善旭.主动移频式孤岛检测方法的参数优化[J].中国电机工程学报,2008,28(1):95-99.Liu Furong,Kang Yong,Duan Shanxu. Parameter optimization of active frequency drift islanding detection method[J]. Proceedings of the CSEE,2008,28(1):95-99.
[3]杨新华,孙艳军,汪龙伟.改进型正反馈主动频移孤岛检测方法的仿真研究[J].电气自动化,2015,37(2):47-50.Yang Xinhua,Sun Yanjun,Wang Longwei. Emulation research of the improved positive-feedback active frequency drift islanding detection[J]. Electrical Automation,2015,37(2):47-50.
[4]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.He Jun,Zhao Gang. Analysis of improved AFD for island detection[J]. Electrical Measurement&Instrumentation,2013,50(3):41-44.
[5]蔡逢煌,郑必伟,王武.结合同步锁相的光伏并网发电系统孤岛检测技术[J].电工技术学报,2012,27(10):202-206.Cai Fenghuang,Zheng Biwei,Wang Wu. Islanding detection method combined with PLL for photovoltaic grid-connected power system[J].Transactions of China Electrotechnical Society,2012,27(10):202-206.
[6]丁浩,何宇,漆汉宏.基于抛物线型SMS算法的孤岛检测[J].电工技术学报,2013,28(10):233-240.Ding Hao,He Yu,Qi Hanhong. A novel islanding detection based on parabolic SMS algorithm[J]. Transactions of China Electrotechnical Society,2013,28(10):233-240.
[7]付光杰,吕金淼.一种改进的正反馈主动频移式孤岛检测方法[J].自动化与仪器仪表,2017,(5):122-124.Fu Guangjie,Lv Jinmiao. An improved positive-feedback active frequency drift islanding detection method[J]. Automation&Instrumentation,2017,(5):122-124.
[8] Yafaoui Ahmad,Wu B,Kouro Samir. Improved active frequency drift anti-islanding detection method for grid connected photovoltaic systems[J]. IEEE Industrial Transactions Electronics Society,2012,27(5):2367-2375.
[9]王玉玲,刘秀芳,陈威.模糊控制在孤岛检测系统中的应用[J].可再生能源,2013,31(9):30-34.Wang Yuling,Liu Xiufang,Chen Wei. Application of fuzzy control for islanding detection method[J]. Renewable Energy Resources,2013,31(9):30-34.
[10]甘忠,李正天.一种新的分布式发电孤岛检测方法[J].电力系统保护与控制,2011,39(1):123-127.Gan Zhong,Li Zhengtian. A novel islanding detection method of distributed generations[J]. Power System Protection and Control,2011,39(1):123-127.
[11]张百乐,王久和.一种改进的正反馈主动移频孤岛检测方法[J].北京信息科技大学学报,2014,29(3):43-48.Zhang Baile,Wang Jiuhe. An improved active frequency-drift with positive feedback islanding detection method[J]. Journal of Beijing Information Science and Technology University,2014,29(3):43-48.
[12]黎璋霞,罗晓曙,廖志贤.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. Improved active frequency drift with positive feedback islanding detection method[J]. Proceedings of the CSU-EPSA,2015,27(4):13-17.
[13]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 frequency-drift method for islanding detection with low harmonics distortion[J]. Transactions of China Electrotechnical Society,2009,24(4):219-223.
[14]高金辉,程静,杨海波.光伏并网逆变器复合式孤岛检测方法[J].电力系统保护与控制,2012,40(11):122-126.Gao Jinhui,Cheng Jing,Yang Haibo. Composite islanding detection method of photovoltaic grid-connected inverter[J]. Power System Protection and Control,2012,40(11):122-126.
[15]刘方锐,余蜜,张宇.主动移频法在光伏并网逆变器并联运行下的孤岛检测机理研究[J].中国电机工程学报,2009,29(12):47-51.Liu Fangrui,Yu Mi,Zhang Yu. Islanding detection evaluation for active frquency drifting methods in multiple photovoltaic grid-connected converters[J]. Proceedings of the CSEE,2009,29(12):47-51.
[16]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 drifting islanding detection with positive feedback of voltage frequency[J]. Power System Protection and Control,2014,42(8):95-100.
[17]郑涛,袁飞,王燕萍.基于模糊控制的快速无盲区的频移式孤岛检测法[J].电力系统保护与控制,2014,42(23):38-43.Zheng Tao,Yuan Fei,Wang Yanping. A fast frequency drifts islandingdetecting method without non-detecting zone based on fuzzy control[J].Power System Protection and Control,2014,42(23):38-43.
[18]邹培源,黄纯.基于模糊控制的改进滑模频率偏移孤岛检测方法[J].电网技术,2017,41(2):574-580.Zou Peiyuan,Huang Chun. An improved slip mode frequency shift islanding detection method based on fuzzy control[J]. Power System Technology,2017,41(2):574-580.
[19]刘芙蓉,康勇,段善旭.一种有效的孤岛检测盲区描述方法[J].电工技术学报,2007,22(10):167-172.Liu Furong,Kang Yong,Duan Shanxu. A novel method for mapping non-detection zone[J]. Transactions of China Electrotechnical Society,2007,22(10):167-172.