基于频率正反馈的无功扰动孤岛检测方法  

Islanding Detection Method of Reactive Power Disturbance Based on Frequency Positive Feedback

作　　者：杜宇鹏[1] 童亦斌[1] 刘京斗[1] 王勉[1] 

机构地区：[1]北京交通大学,国家能源主动配电网技术研发中心,北京电动车辆协同创新中心,北京100044

出　　处：《电力电子技术》2017年第7期44-46,共3页Power Electronics

基　　金：北京市科技计划项目(Z161100000716003)~~

摘　　要：为保证系统的正常工作和安全运行,光伏发电系统应具备孤岛检测功能。通过分析传统无功扰动方法,提出一种基于频率正反馈的无功扰动孤岛检测方法,通过周期性无功扰动量使公共耦合点(PCC)频率偏移,并在进入孤岛状态后,通过扰动函数的正反馈作用,加大无功扰动量,加快频率偏移,使其超出限值,从而实现防孤岛效应保护功能。实验结果表明,该方法对电能质量影响小,具有无检测盲区、检测速度快的优点。In order to guarantee the normal work and safe operation of the system, photovoltaic power generation sys- tem should have an islanding detection function.By analyzing the traditional reactive power disturbance method, an is- landing detection method of reactive power disturbance based on frequency positive feedback is presented ,which makes frequency at point of common coupling（PCC） drift by outputting periodic reactive power disturbance,and when it comes to an islanding state, a frequency positive feedback will be enabled, which can increase reactive power dis- turbance to accelerate the frequency drift tiU limitation of standard.Finally,the purposes of anti-islanding protection can be achieved.The experimental results show that the influence for power quality by taking this method is small, and there is no non-detection zone, the islanding detection speed is also fast.

关 键 词：光伏发电 孤岛检测 无功扰动 频率正反馈 

分 类 号：TM615[电气工程—电力系统及自动化]