【摘要】 孤岛检测技术能保证逆变型光伏发电系统并网对电力系统安全运行和稳定工作。基于对传统无功电流扰动方法的分析,提出了一种改进的频率正反馈的无功电流扰动孤岛检测方法。通过周期性地施加无功扰动电流和扰动函数的正反馈作用,加大无功扰动量,使频率越限,从而实现防孤岛效应保护功能。通过Matlab/Simulink仿真软件搭建了仿真模型,实验结果表明,该方法对电能质量影响小,不向电网注入谐波,具有无检测盲区、检测速度快的优点。更多还原

【Abstract】 The islanding detection technology can guarantee the safe and stable operation of the inverting photovoltaic power generation system in connection with the power system. Based on the analysis of the traditional method of reactive current disturbance,this paper presents an improved frequency positive feedback method for islanding detection of reactive current disturbance. Through the periodic application of the reactive disturbance current and the positive feedback function of the disturbance function,the amount of reactive disturbance is increased to limit the frequency,so as to achieve the anti-islanding effect protection function. The simulation model was built by Matlab/Simulink simulation software. The experimental results show that this method has little influence on power quality and does not inject harmonics into the power grid. It has the advantages of no detection blind zone and fast detection speed.更多还原