基于FBD法的分布式光伏并网系统谐波检测方法  

Harmonic detection method for distributed photovoltaic grid-connected system based on FBD method

作　　者：刘念祖 耿琦[1] 王心怡[1] 张凯[1] 王国亮[1] LIU Nian⁃zu;GENG Qi;WANG Xin⁃yi;ZHANG Kai;WANG Guo⁃liang(State Grid Zhengzhou Power Supply Company,Zhengzhou 450000,China)

机构地区：[1]国网郑州供电公司

出　　处：《电子设计工程》2019年第24期47-50,56,共5页Electronic Design Engineering

基　　金：国网河南省电力公司科技项目(521710170005)

摘　　要：随着国内光伏并网系统的应用规模不断扩大,不同规模的光伏系统并网后可带来大量非线性负载,受天气等因素的影响,使得并网系统给电网带来大量谐波严重影响电网的电能质量。针对此问题,文中提出了一种基于FBD法的光伏并网谐波检测方法,分析了FBD法和瞬时无功检测法的优势与不足,结合FBD法对传统瞬时无功检测法进行改进,减少了繁琐的坐标变换过程,并将FBD法由单相系统扩展应用至三相系统。基于FBD法改进的瞬时无功检测法显著降低了运算环节和运算量,从而提高了检测速度,使谐波检测具有良好的实时性。The application scale of domestic photovoltaic grid-connected system is expanding constantly,and a large number of non-linear loads are brought by different scale photovoltaic systems after gridconnected.In addition,weather and other factors make the grid-connected system bring a large number of harmonics to the grid,which seriously affect the power quality of the grid.To solve this problem,a harmonic detection method for photovoltaic grid-connected system based on FBD method is proposed in this paper.The advantages and disadvantages of FBD method and instantaneous reactive power detection method are analyzed.Combined with FBD method,the traditional instantaneous reactive power detection method is improved,which reduces the tedious coordinate transformation process and extends FBD method from single-phase system to three-phase system.The improved instantaneous reactive power detection method based on FBD method significantly reduces the operation link and the amount of calculation,improves the detection speed,and makes the harmonic detection have better real-time performance.

关 键 词：FBD 光伏 并网 瞬时无功 谐波检测 

分 类 号：TN713.8[电子电信—电路与系统]