基于滑模移频法的光伏发电并网系统孤岛检测混合算法  

Mixed Islanding Detection Method for Grid-connected Photovoltaic System Based on Slip-mode Frequency Shift Method

作　　者：余运俊[1] 王鹤官 范文奕 黄荟瑾 石晓凤 YU Yunjun;WANG Heguan;FAN Wenyi;HUANG Huijin;SHI Xiaofeng(School of Information Engineering,Nanchang University,Nanchang 330000,China)

机构地区：[1]南昌大学信息工程学院,南昌330000

出　　处：《电力系统及其自动化学报》2018年第8期32-37,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61563034);国家国际科技合作专项资助项目(2014DFG72240);江西省自然科学基金资助项目(20151BAB206051);江西省2016年度百人远航工程;国家留学基金委资助项目(201508360100)

摘　　要：由于孤岛现象带来的诸多危害,为保证光伏并网发电系统的安全运行,有必要对电网实行孤岛检测。首先,对基于主动移相的滑模移频法与相位突变检测法的工作原理进行阐述,并分析其在检测盲区上存在的缺陷;然后以相位为出发点,将这两种方法有机结合,提出一种混合式孤岛检测法。该混合法通过加入相位扰动来影响电网公共点相位和频率变化,以此变化来判断孤岛。理论分析与实验结果表明,该混合法能有效减小检测盲区,并且具有检测速度较快以及对电能质量影响较小的优点。Due to the harm resulting from the phenomenon of islanding,it is necessary to perform islanding detection for the grid-connected photovoltaic system to guarantee its safe operation.First,the working principles of active phase shift based slip-mode frequency shift method and phase jump detection method are introduced,and their disadvantages in non-detection zones are analyzed.Then,from the aspect of phase,a mixed islanding detection method based on the combination of these two methods is proposed,with which the islanding can be judged by adding phase disturbance to affect the phase and frequency at the point of common coupling(PCC).The theoretical analysis and experimental results showed that this mixed method can effectively reduce the non-detection zone,and it had advantages of high detection speed and less influence on power quality.

关 键 词：孤岛检测 滑模频率偏移法 相位突变检测法 光伏发电并网系统 

分 类 号：TM732[电气工程—电力系统及自动化] TM91