摘要
在现代电力系统中,可能产生的孤岛效应一定程度上限制了光伏并网发电系统(photovoltaic grid connected power system,PV)的应用和发展,孤岛检测是光伏系统必须具备的功能。传统的滑模频率偏移法有检测效率较低、对系统发电质量影响较大等缺点,提出了一种将传统滑模频率偏移法和电压正反馈机制相结合的孤岛检测策略。分析了改进方法的工作原理,基于d q变换实现了有功电压、无功电压以及有功电流、无功电流的分离,通过与参考量做差作为反馈量,达到破坏功率平衡从而检测出孤岛的目的。仿真实验结果验证了该方法的可行性和有效性,对工程应用有一定的参考价值。
In modern power system, the application and development of photovohaic grid connected power system （PV） may be limited by islanding effect to a certain degree,so islanding detection is a necessary function of photovohaic system.The traditional method of slip-mode frequency shift（SMS） has shortcomings of low detection efficiency,poor power quality and so on,therefore a is- landing detection strategy is presented in this paper which is combined with traditional SMS and voltage positive feedback mecha- nism.The working principle of the improved method is analyzed,and the separation of the active voltage,reactive voltage,and active current,reactive current can be realized by using dq transformation.The difference value with reference can be a feedback to destroy the balance of power,then the islanding can be detected rapidly.The simulation and experimental results verify the feasibility and ef- fectiveness of the method,and it also has certain reference value for engineering application.
出处
《电子技术应用》
北大核心
2015年第3期58-60,64,共4页
Application of Electronic Technique
基金
四川省教育厅重点项目基金资助(09ZA112)
关键词
光伏并网发电系统
孤岛效应
孤岛检测
滑模频率偏移法
dq变换
反馈机制
photovoltaic grid connected power system
islanding effect
islanding detection
slip-mode frequency shift
dq transform
feedback mechanism
