一种参数自适应的孤岛检测方法-《计算机技术与发展》

文章信息/Info

Keywords:: islanding detection; frequency shift; load phase angle; blind spot; self-adaptive

摘要:: 随着分布式发电的迅速发展，越来越多的可再生能源被转化为电能通过并网逆变器输送到电网。并网逆变器要求具备孤岛检测功能，主动式孤岛检测技术以其优越性越来越多地被应用于孤岛检测中，文中选取了最常用的主动频率偏移法(AFD)及改进的主动频率偏移法(AFDPF)，分析了并网逆变器侧移频孤岛检测技术与负载组合之间的关系，系统地归纳了失败的原因，盲区的分布，影响盲区分布的算法参数之间的关系，通过MATLAB/SIMULINK仿真软件验证了盲区分布与算法参数之间的关系，提出了算法参数对负载品质因数自适应调节的方法。仿真实验验证了此方法在缩小检测盲区与降低电流畸变的有效性

Abstract:: With the rapid development of distributed generation, grid-connected converters are widely employed for renewable energy sources utilization. The islanding detection is a mandatory function for such converters,active islanding detection technology is increasing-ly applied in islanding detection with its superiority. Select commonly used AFD and AFDPF,analyze the relationship between the fre-quency islanding detection technology and load combinations,systematically summarize the failure reason,blind area distribution,the rela-tionship between algorithm parameters of influencing the blind area distribution. MATLAB/SIMULINK simulation software is used to verify the relationship between the blind spot distribution and algorithm parameters,and an adaptive adjustment method of load quality factor is proposed for algorithm parameters. The experiment demonstrates this method can narrow the detection blind area and reduce the effectiveness of current distortion