基于Z源逆变器混合式孤岛检测方法研究
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摘要
针对传统逆变器结构的主动频移式孤岛检测方法存在对电能质量影响较大的问题,阐述了传统逆变器的结构和孤岛效应发生的原理,分析了Z源逆变器的工作原理和混合式孤岛检测方法的检测原理,提出了一种基于Z源逆变器的混合式孤岛检测方法。该逆变器结构采用一种改进型Z源逆变器并且利用盲区判别模型来自动选择检测方法,能够判断出孤岛发生。仿真结果表明,基于Z源逆变器的混合式孤岛检测方法可以保证在各种负载情况下检测出孤岛效应的发生,减小对电能质量的影响。
The active frequency shift islanding detection method with traditional inverter structure has great influence on power quality. Due to this problem, the structure of the traditional inverter and the principle of the island effect are explained. The principle of Z source inverter and the principle of hybrid island detection method are analyzed successively. Above all, a hybrid island detection method based on Z source inverter is proposed. The inverter structure adopts a modified Z-source inverter, and the blind zone discriminant model is used to automatically select the detection method and to determine the island occurrence. The simulation results show that the hybrid method proposed in this paper can detect the occurrence of islanding effect under various load conditions and reduce the impact on power quality.
The active frequency shift islanding detection method with traditional inverter structure has great influence on power quality. Due to this problem, the structure of the traditional inverter and the principle of the island effect are explained. The principle of Z source inverter and the principle of hybrid island detection method are analyzed successively. Above all, a hybrid island detection method based on Z source inverter is proposed. The inverter structure adopts a modified Z-source inverter, and the blind zone discriminant model is used to automatically select the detection method and to determine the island occurrence. The simulation results show that the hybrid method proposed in this paper can detect the occurrence of islanding effect under various load conditions and reduce the impact on power quality.
引文
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[2] 吴志鹏.分布式光伏发电系统的控制和孤岛检测故障[D].上海:华东理工大学,2014.WU Zhipeng.Distributed photovoltaic power generation system control and islanding faults[D].Shanghai:East China University of Science and Technology,2014.
[3] 高蕾.逆变并网型光伏系统的孤岛检测方法研究[D].南京:东南大学,2015.GAO Lei.Research on island detection method of inverter grid-connected photovoltaic system[D].Nanjing:Southeast University,2015.
[4] 王思.Z源逆变器拓扑及控制方法的研究[D].成都:西南交通大学,2015.WANG Si.Research on Z source inverter topology and control method[D].Chengdu:Southwest Jiaotong University,2015.
[5] 赵志德.准Z源变换器在单相逆变电路应用的研究[D].秦皇岛:燕山大学,2012.ZHAO Zhide.Research on application of quasi-Z source converter in single-phase inverter circuit[D].Qinhuangdao:Yanshan University,2012.
[6] 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,2011.ZHANG Xing,CAO Renxian.Solar photovoltaic grid-connected power generation and its inverter control[M].Beijing:Mechanical Industry Press,2011 .
[7] 杨富磊.分布式并网发电系统的孤岛检测方法研究[D].吉林:东北电力大学,2016.YANG Fulei.Research on island detection method for distributed grid-connected power generation system[D].Jilin:Northeast Electric Power University,2016.
[8] 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.ZHOU Jie.Research on island detection method for distributed grid-connected power generation system[D].Nanjing:Nanjing University of Posts and Telecommunications,2013.
[9] 张洪铭.混合式孤岛检测方法的研究[D].成都:西南交通大学,2017.ZHANG Hongming.Research on hybrid island detection method[D].Chengdu:Southwest Jiaotong University,2017.
[10] 路艳洁,席志红,王姜铂.FFT法与数字相关法在相位测量上的比较[J].信息技术,2007,31(12):105-108.LU Yanjie,XI Zhihong,WANG Jiangbo.Comparison of FFT method and digital correlation method in phase measurement[J].Information Technology,2007,31(12):105-108.