摘要
采用Qf0×Cnorm空间描述法分析主动移频式孤岛检测方法的检测盲区,对带正反馈的主动移频式(AFDPF)孤岛检测方法的盲区大小与反馈增益间的关系进行了分析,并对初始扰动系数进行了修正,减小AFDPF孤岛检测法对并网电能品质的影响。运用Matlab软件分析比较了修正前后的孤岛检测盲区。仿真结果表明,参数修正后孤岛检测盲区明显把盲区推向更高品质因数区域,而且降低了谐波畸变率。实现了品质因数小于2.5时,AFDPF孤岛检测方法存在无孤岛检测盲区区域。
Non-detection zones （NDZs） are important index to evaluate the performance of islanding detection methods. A proper NDZs mapping can reflect application area of islanding detection effectively. In this paper,Qf0×Cnorm, space mapping is adopted in NDZs detection of active frequency drift with positive feedback （AFDPF）. Relationship between NDZs size of AFDPF and feedback gain is deduced, and coefficient of initial disturbance is amended. NDZs are compared by simulation before and after coefficients are amended. Simulation results reveal that NDZs after coefficient amended are located in high factor of quality area and the harmonic distortion is reduced, if factor of quality is less than 2.5, there are no NDZs for AFDPF of islanding detection.
出处
《机械制造与自动化》
2013年第1期184-186,共3页
Machine Building & Automation
关键词
正反馈主动移频
孤岛检测
检测盲区
谐波畸变率
active frequency drift with positive feedback（AFDPF）
islanding detection
non-detection zones（NDZs）
harmonic distortion
