摘要
由于微电网要求能够在并网和孤岛两种模式下运行,孤岛检测技术必不可少。为此,利用逆变器下垂控制方法中频率和有功的线性关系,在参考功率上添加有功扰动,使逆变器的频率在电网故障时偏离出正常范围,以达到孤岛检测的目的。在此基础上,改进了有功扰动的选取,通过判断频率连续偏移次数来给定相应的有功扰动系数,在系数中引入频率正反馈,加快孤岛检测速度,减少对微电网并网运行时的电能质量的影响。同时,分析微电网结构特点,给出了孤岛检测算法在其中的应用方案。通过仿真,证明了孤岛检测算法用于微电网的有效性。
Islanding detection technology is essential for micro-grid which is required that it must work at grid-connected and islanding modes. With regards to this, an islanding detection method, which adds positive power disturb- ances on the reference active power to make inverter frequency deviate out of normal range when grid is going wrong, is presented. On this basis, the frequency positive feedback is added to the coefficient by judging continuous times of frequency deviation to give corresponding disturbance to improve the selection of active power disturbance, which can accelerate the speed of islanding detection and reduce the impact on power quality when grid is in the normal state. Meanwhile, a program which islanding detection algorithm is applied in micro-grid by analyzing its structure characteristics. At last, simulation results show the effectiveness of islanding detection algorithm in micro-grid.
出处
《电测与仪表》
北大核心
2017年第5期62-67,74,共7页
Electrical Measurement & Instrumentation
基金
广东省引进创新科研团队计划资助项目(2011N015)
关键词
下垂控制
功率扰动
孤岛检测
频率正反馈
droop control, power disturbance, islanding detection, frequency positive feedback
