正反馈有源频率扰动孤岛检测的一种改进算法  

An Improved Active Frequency Drift With Positive Feedback Method for Islanding Detection

作　　者：王武[1,2,3] 蔡逢煌[2,3] 郑必伟[2] 

机构地区：[1]华中科技大学,博士后流动站,湖北武汉430074 [2]福州大学,电气工程与自动化学院,福建福州350108 [3]漳州科华技术有限责任公司,博士后工作站,福建漳州363000

出　　处：《电力电子技术》2012年第2期45-47,共3页Power Electronics

基　　金：国家火炬计划立项项目(2010GH051112);福建省科技计划区域重大项目资助(2010H4021)~~

摘　　要：反孤岛保护是光伏并网发电系统的主要特性指标。这里结合周期性扰动的正反馈有源频率扰动(AFDPF)法和2N周期电流扰动法的优点,提出一种新型AFDPF孤岛检测法。该方法通过检测电流频率扰动后输出端电压频率的变化来判断扰动效果,实现了孤岛保护。基于PSIM和Matlab软件平台对孤岛保护效果进行仿真,而后在6 kW的并网逆变器实验平台进行验证。仿真和样机实验结果表明,该方法可快速检测出孤岛状态。Anti-islanding protection is a mandatory feature for grid-connected photovoltaic system.A improved active frequency drift with positive feedback （AFDPF） method is proposed, combining the advantages of AFDPF with periodic disturbance and current-disturbing method in the 2N period.In this method,the direction of perturbation is determined by the frequency of output voltage after the disturbance of frequency of output current, achieves the islanding protection.Simulation programs for the control schemes are verified in PSIM and Matlab software initially to see the effect of the control method.Mterwards, it is verified in a 6 kW inverter.Results show that the proposed method process such advantages as fast response.

关 键 词：光伏并网系统 孤岛检测 有源频率扰动 

分 类 号：TM615[电气工程—电力系统及自动化]