一种改良的主动频率偏移孤岛检测方法
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摘要
分布式发电系统中的孤岛检测问题是目前研究的难点,特别是传统主动频率偏移法在逆变器输出功率与负载功率平衡或者不平衡程度较小时,较难检测出孤岛并且输出电流存在较大的谐波含量;针对这个问题,在光伏并网发电系统中提出了一种改良的主动频率偏移孤岛检测方法;该方法把主动频率偏移与卡尔曼滤波的谐波估计相结合组成判断是否发生孤岛的依据;在Matlab/Simulink下进行系统仿真,验证了该方法有效地减少了传统主动频率偏移法存在的检测盲区,也明显地降低了逆变器输出电流的谐波含量。
Island detection in the distributed power generation system is the difficulty of the current research.In particular,the traditional active frequency drift method is difficult to detect the islanding phenomenon and the current-output has large harmonics contents when the inverter output power and load active power keep balance or a small degree of imbalance.For this problem,an improved active frequency drift island detection method is proposed in PV grid-connected power generation system.This method combines the active frequency drift and Kalman filtering of harmonic estimation method to determine whether or not it is produced the islanding phenomenon.At the same time,by reducing the frequency detection threshold,the traditional active frequency drift method reduces effectively non-detection zone,and reduces significantly the inverter output current harmonic contents.Simulation of Matlab/Simulink is carried out to verify the effectiveness of the proposed method.
Island detection in the distributed power generation system is the difficulty of the current research.In particular,the traditional active frequency drift method is difficult to detect the islanding phenomenon and the current-output has large harmonics contents when the inverter output power and load active power keep balance or a small degree of imbalance.For this problem,an improved active frequency drift island detection method is proposed in PV grid-connected power generation system.This method combines the active frequency drift and Kalman filtering of harmonic estimation method to determine whether or not it is produced the islanding phenomenon.At the same time,by reducing the frequency detection threshold,the traditional active frequency drift method reduces effectively non-detection zone,and reduces significantly the inverter output current harmonic contents.Simulation of Matlab/Simulink is carried out to verify the effectiveness of the proposed method.
引文
[1]赵为.太阳能光伏并网发电系统的研究[D].合肥:合肥工业大学,2003.
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[3]杨新华,孙艳军,汪龙伟,等.改进型正反馈主动频移孤岛检测方法的仿真研究[J].上海:电气自动化,2015,37(2):47-50.
[4]肖巧景,张宇翔,郭敏.一种新的频率偏移技术在光伏并网发电系统孤岛检测中的应用[J].陕西:现代电子技术,2007(1):107-108.
[5]刘方锐,段善旭,康勇,等.多机光伏并网逆变器的孤岛检测技术[J].北京:电工技术学报,2010,25(1):167-171.
[6]刘东旭.基于滑模频率偏移法的光伏孤岛检测的研究[D].哈尔滨:哈尔滨理工学,2015.
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[8]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].天津:电力系统及其自动化学报,2015,27(4):13-17.
[9]杨恢东,吴浪,李心茹,等.改进的周期主动频移式孤岛检测方法[J].许昌:电力系统保护与控制,2016,44(16):50-55.
[10]袁精,赵清林,张纯江,等.一种改进型光伏并网逆变器孤岛检测方法研究[J].天津:电源学报,2017,15(6):56-61.
[11]王秀丽,武泽辰,曲翀.光伏发电系统可靠性分析及其置信容量计算[J].北京:中国电机工程学报,2014,34(1):15-21.
[12]李雅梅,蔡军.一种新颖的变步长光伏系统MPPT控制方法[J].计算机测量与控制,2014,22(6):1981-1983.
[13]陈佳斌,陈阿莲.一种改进的主动频率偏移孤岛检测算法[J].天津:电源学报,2017,15(3):140-147.
[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].许昌:电力系统保护与控制,2011,39(6):147-154.
[3]杨新华,孙艳军,汪龙伟,等.改进型正反馈主动频移孤岛检测方法的仿真研究[J].上海:电气自动化,2015,37(2):47-50.
[4]肖巧景,张宇翔,郭敏.一种新的频率偏移技术在光伏并网发电系统孤岛检测中的应用[J].陕西:现代电子技术,2007(1):107-108.
[5]刘方锐,段善旭,康勇,等.多机光伏并网逆变器的孤岛检测技术[J].北京:电工技术学报,2010,25(1):167-171.
[6]刘东旭.基于滑模频率偏移法的光伏孤岛检测的研究[D].哈尔滨:哈尔滨理工学,2015.
[7]殷桂梁,孙美玲,肖丽萍.分布式发电系统孤岛检测方法研究[J].北京:电子测量技术,2007(1):1-6.
[8]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].天津:电力系统及其自动化学报,2015,27(4):13-17.
[9]杨恢东,吴浪,李心茹,等.改进的周期主动频移式孤岛检测方法[J].许昌:电力系统保护与控制,2016,44(16):50-55.
[10]袁精,赵清林,张纯江,等.一种改进型光伏并网逆变器孤岛检测方法研究[J].天津:电源学报,2017,15(6):56-61.
[11]王秀丽,武泽辰,曲翀.光伏发电系统可靠性分析及其置信容量计算[J].北京:中国电机工程学报,2014,34(1):15-21.
[12]李雅梅,蔡军.一种新颖的变步长光伏系统MPPT控制方法[J].计算机测量与控制,2014,22(6):1981-1983.
[13]陈佳斌,陈阿莲.一种改进的主动频率偏移孤岛检测算法[J].天津:电源学报,2017,15(3):140-147.