基于自适应加速移频的PV孤岛检测与仿真  

A Novel Integrated Islanding Detection Method Based on Adaptive Accelerating Frequency Drift

作　　者：刘莹[1] 陈金玉[2] 郑黎[3] 

机构地区：[1]四川工程职业技术学院计算机科学技术系,四川德阳618000 [2]重庆大学自动化学院,重庆400044 [3]四川工程职业技术学院就业办,四川德阳618000

出　　处：《计算机测量与控制》2015年第3期702-705,共4页Computer Measurement &Control

基　　金：重庆市基础与前沿研究计划项目(cstc2013jjB40009)

摘　　要：针对并网光伏(PV)系统的孤岛检测问题,提出一种复合负脉冲电流幅值干扰的自适应加速移频法;基于公共耦合点电压频率朝某个方向的持续变化次数,该方法对频率偏移正反馈系数进行自适应分段调节以加速频率偏移越限,如果变化次数超过12次,且频率仍未越限,则施加持续2个工频周期的负脉冲电流幅值干扰,触发欠压保护,从而检测出孤岛;Matlab仿真表明,与传统的AFD方法相比,该方法不仅对电网谐波影响小,而且孤岛检测盲区小,能有效在高速自动重合闸动作之前使光伏系统与电网解列,具有重要的应用价值。As grid photovoltaic （PV） system has the problem of island detection, a kind of adaptive accelerated frequency deviation meth- od with complex negative pulse current amplitude interference is proposed. Based on the times of continuous changes towards certain direction of the voltage pressure in point of common coupling, this method makes adaptive segmented adjustment to the positive feedback coefficient of frequency deviation to accelerate the threshold--crossing of the frequency deviationg if the changes are more than 12 times and the frequency does not cross the threshold, then the negative pulse current amplitude interference lasting 2 power frequency periods will be applied to trig ger the low--voltage protection and detect the island. Matlab simulation shows that, compared with the traditional AFD method, this method not only has small influence to power harmonics, but also has small non--detection zone for the island, so that it can discormect the PV system and power grid before rapid automatic reclosure and has important application value.

关 键 词：并网光伏(PV)系统 孤岛检测 自适应加速频率漂移(AAFD) 负脉冲电流幅值干扰 盲区检测 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]